Bs 2 group assignment

School of Architecture, Building & Design

BUILDING SERVICES 2 (BLD 60503) GROUP ASSIGNMENT

CASE STUDY ON PJ TRADE CENTRE

MECHANICAL VENTILATION AIR CONDITIONING SYSTEM

FIRE PROTECTION SYSTEM

MECHANICAL TRANSPORTATION SYSTEM

ELECTRICAL SUPPLY SYSTEM

STUDENT NAME: NG HUoY MIIN 0319097 LEE SHZE HWA 0320053 LEE KAILYN 0320273 LIEW POH KA 0320424 HOI WEI HAN 0323335 LECTURER: Mr. TAN HEE CHAI DATE OF SUBMISSION: 9th DEC 2016 WORD COUNT:

August 2016 semester

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CONTENTS 1.0 INTRODUCTION 2.0 MECHANICAL VENTILATION AND AIR CONDITIONING SYSTEMS 2.1 INTRODUCTION 2.2 Mechanical Ventilation 2.3 Air-Conditioning System 2.4 PROLOGUE 2.5 INTRODUCTIONS AND FUNCTIONS 2.6 Types of The Air Conditioning System 2.7 UBBL REQUIREMENTS AND REGULATIONS. 3.0 FIRE PROTECTION SYSTEMS 3.1 pROLOGUE 3.2 ACTIVE FIRE PROTECTION SYSTEM 3.3 PASSIVE FIRE PROTECTION SYSTEM 3.4 UBBL REQUIREMENT AND REGULATIONS 4.0 MECHANICAL TRANSPORTATION SYSTEMS 4.1 LITERATURE REVIEW 4.2 ELECTRIC TRACTION ELEVATOR (PASSENGER LIFT) 4.3 COMPONENTS 4.4 OPERATING PANELS 4.5 UBBL REQUIREMENTS AND REGULATIONS 5.0 ELECTRICAL SUPPLY SYSTEMS 5.1 LITERATURE REVIEW 5.2 TNB SUBSTATION 5.3 MAIN SWITCH ROOM 5.4 LOW VOLTAGE SWITCH ROOM 5.5 ELECTRICAL RISER ROOM 5.6 METER ROOM 5.7 BATTERY ROOM 5.8 GUN SET ROOM 5.9 UBBL REQUIREMENTS AND REGULATIONS 6.0 OVERALL CONCLUSION


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INTRODUCTION PJ Trade Centre has been completed in the month of February 2009 and is designed by Malaysian Developer, Tujuan Gemilang Sdn.Bhd. It is located in Petaling Jaya which is Golden Triangle that a dynamic centre for shopping and business. The surrounding landscape of PJ Trade Centre is designed by Seksan Design.

SECTION DRAWING OF PJ TRADE CENTRE This building was built in the centre of Bandar Damansara Perdana,Petaling Jaya and 5.4 acres of land . It consists of 4 towers and 21 floors each. PJ trade centre is designed to achieve comfortable shopping areas and give the people have a healthy workspace to work. It gives natural light which people can enjoy the sunlight and breeze of wind while staying inside the building.

The design of this building getting closer to nature motives. It has 12 comfortable sky terraces which covering with wall creepers and hanging vines. Besides that, PJ trade center is a plaza covered with 2.5 acres of lushly landscaped that have achieved green environment.


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Abstract This case study will be looking into services system of the workspace in PJ trade Center such as Air Conditioning System, Fire Protection System, Mechanical Transportation System and Electrical Supply System. The aim of this report is to introduce the fundamentals of the systems which are mentioned above. We are required to do an analysis of own understandings based on the regulations of this building from UBBL Building By Law (UBBL). ACKNOWLEDGEMENT We are grateful that the staff of PJ trade Center willing giving us an opportunity to visit the building. The staff has brought us to have a tour visit around the building through the prominent service rooms such as lift motor rooms, fire fighting system room, electric room and chiller room. Besides that, he also show us more information secretly to further describe the systems throughout the buildings. We would like to give a big thank to him for explaining the systems of each room and machines relentlessly. We also need to give special thanks to our lecturer Mr Tan Hee Chai for the guidance and provide us more information for the assignment. Without involvement of his help, this report cannot sufficiently be finished. PROJECT OBJECTIVES · Expose to the real life case study of the basic principles, processes and equipment of various building services systems for a high raise building. · Provide an opportunity to demonstrate our understanding of building services systems in compliance with the local authority requirements. · To make aware of the challenges and problems in executing the installation of the various building services.


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PROJECT OUTCOMES · Upon completion of the case study, students should be able to identify and understand the functions of each system. · Understand and the application of the requirements of local authority. · Understand and appreciate the solutions to the problems and challenges in carrying out the installation of the various building services. PROJECT REQUIREMENT One case study- the building services of shopping complex. 1. Mechanical Ventilation and Air-Conditioning System 2. Fire Protection System 3. Vertical Transportation System and 4. Electrical Power Supply System Identify estimate size of the spaces and explain the functions of the building services components identified. The systems can be illustrated in a diagram and the case study shall indicate the local uniform building by-laws (UBBL 1984) of the components.


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2.0 MECHANICAL VENTILATION

AND AIR CONDITIONING SYSTEMS

2.1 INTRODUCTION


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Heating, ventilation and cooling (HVAC) is the innovation of indoor and vehicular natural solace. Its objective is to provide a sustainable thermal comfort and adequate indoor air quality. HVAC framework configuration is a mechanical engineering’s subdiscipline, in view of the standards of thermodynamics, heat energy exchange and also the fluid mechanics. Refrigeration is added to the field's condensing as HVAC or HVAC & R in some cases. HVAC is a critical piece of private structures, for example, single family homes, flat structures, lodgings and soho, medium to substantial mechanical and office structures, for example, high rises and clinics, locally available vessels, and in marine situations, where sheltered and sound building conditions are directed regarding temperature and moistness, utilizing outside air from outside.

2.2 Mechanical Ventilation

Mechanical ventilation system is the system of circulating fresh air by using the fans and ducts rather than depending on airflow through a cracks or tiny holes of the wall in a room, roofs or openings. Furthermore, this has been widely utilized since the earlier of twentieth century, the fan has mostly outmoded the unstable natural system for the assisting of air movement. There are some of the main components of mechanical ventilation system: 2.2.1 Fan

It impacts the static pressure or energy and velocity or kinetic energy to provide the movement of air with the motive power. A fan's ability for air development relies on upon its qualities, for example, sort, estimate, shape, number of sharp edges and speed. Other than that, there are four classifications of fan reasonable for air development in ventilation frameworks, which are cross-stream, propeller, hub stream and radial. 2.2.2 Filters

Filters are utilized to evacuate suspended particles, smells and contaminants. Installation of the filters are normally took place at the inlet grille. 2.2.3 Ductworks

The ductworks are responsible for the channeling of the air outside towards indoors or the indoor air towards outside. It is typically delivered in circular, rectangular or square cross-sections in a few distinct materials. 2.2.4 Fire dampers


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The function of fire damper is to prevent the spreading of fire from a room to another room when there is a fire accident occurred in a sudden. It is normally installed in the compartment wall. 2.2.5 Diffusers

The diffusers extend from straightforward punctured plated and grilles to the air distribution which is more mind boggling and productive coned. The diffuser and grille are situated at the ductwork edge where the air can discharged into the room without much of a stretch . 2.2.6 AHU ( Air Handling Unit )

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Air Handling Unit unit (AHU) it may be used to circularize and condition air as and only a HVAC system. An air handler typically holds a blower, cooling or heating elements, chambers or filter racks, dampers and sound attenuators. Air handlers normally link to the ductwork that convey the molded air through those building and also come back it to AHU. Little air handlers need aid called terminal units, and might best incorporate an air blower, filter and coil. These littler units would also known as blower coils or fan loop units.


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http://www.daikin.com/products/ac/lineup/ahu_fcu/images/pic_lineup_ahu.jpg


http://www.gibbonsgroup.co.uk/uploads/assets/infographics/inside-an-ahu-zoom-in-diagram-mark-5-17052016.jpg The components of AHU (Based on Figure 1.14) perform every duties of course comparative with an ordinary refrigeration system. However, all of these parts are bigger in size and have higher capacities. The compressor is about open responding kind for various cylinders and also will be cooled by the water just in the car motor. Those compressor and the condenser would about shell and more the tube kind. At the same time, in the little ventilating system capillary will be utilized as the extension valve, in the focal ventilating system thermostatic extension valve is utilized. Those chilled may be passed through those ducts to every last one of rooms, halls and also other spaces that would with be air molded. Hence, on the whole the rooms there is best those conduit passim those chilled air and even more that there would no individual cooling coils, and other parts of the refrigeration system in the rooms. The thing that will be we get over each room is the totally quiet and also profoundly viable air conditioning system in the spaces. What is more,, the measure for chilled air that is required in the space might a chance to be controlled eventually by those openings contingent upon those aggregate high temperature load inside the space.

AHU in the PJ Trade Centre.


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2.3 Air-Conditioning System

The air-conditioning system is a system of eliminating of heat from a limited space, consequently cooling the air, and evacuating the humidity. Air conditioners frequently utilize a fan to convey the molded air to a possessed space, for example, a car or a building to enhance indoor air quality and thermal comfort. A relative humidity within 40 and 60 percentage band and temperature in a range from 19 to 23 degree Celsius should be achieved for the air temperature. There are available of 4 types of air-conditioning system :- 2.3.1 Room Unit Air-Conditioning ( Window Unit )

The window unit air conditioner represent the simplest types of air-conditioning system and it is only suitable for tiny space or room. It is normally installed at the wall or window openings. The fan blows the air over the evaporator to cooled the interior air. As a second fan blows the outside air through the condenser, the heat from the exterior drawn from interior is dissipated into the environment. A building or large house may have a few such units, permitting every space to be cooled independently. Furthermore, it can also be separated into two sections, which are the exterior part ( condenser ) and the interior part ( evaporator ) that splitted by an insulated partition. 2.3.2 Split Unit Air-Conditioning System

Split unit air-conditioning system are considered as an one-to-one systems comprising of a evaporator ( fan coil ) unit connected to another external condensing unit. The copper tubing and electrical cabling connect the outdoor and indoor units together. Besides that, this type of air-conditioning system has been very famous nowadays due to it minimizes the noise produced during operation, has an elegant outward appearance, and installation without making a hole in the wall. 2.3.3 Plant or Centralized Air-Conditioning System

Central air conditioning plants are usually utilized for application in large buildings with offices and commercial uses where a high demands of cooling loads are required. It has the equal limitation of the equal air quality being transferred all over the building. However, the zoned thermostats can control the temperature of each element.


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2.3.4 Packaged Unit Air-Conditioning System Packaged air conditioners are utilized for the cooling storages that available in

the specific rated storages of 3, 5, 7, 10 and 15 tons. All the vital components of the air conditioners are encased in a single casing as the window air conditioner like the name implies, the packaged air conditioners. Hence the compressor, air handling unit, filter and the cooling coil are all stored in a single casing and erected at the factory. The packaged air conditioners are separated into two categories, which ones with air-cooled condenser, and water-cooled condenser.

2.4 PROLOGUE Both Air conditioning system and Mechanical Ventilation are alternatively be chosen as the primary source for providing of a sustainable air circulation, air quality, air humidity and air temperature control indoor of a building currently. PJ Trade Centre connected the idea towards greeneries and utilizes a greater amount of natural ventilation with a specific main goal to minimize the utilization of mechanical air conditioning system within the building. For the most part in PJ Trade Centre, there are two sorts of air-conditioning system have chosen by them to utilize in the building, which are the centralized system and the split air-conditioning system. Tower A and C utilized the centralized air-conditioning system while the Tower B (Bata) utilize the Split Air-Conditioning System. The reason for the choice of air-conditioning system in Tower A and C is both towers are under a single owner, Gamuda dissimilar with Tower B which is owned by another holder. Thus, different types of air-conditioning system in PJ Trade Centre has its own particular point of view in approaching. There will be more focusing on the Split air-conditioning system in this report as our team are doing Tower B. The components in the building are mostly covered in the syllabus we had learned in lecture class with respect to Mechanical Ventilation System. It is truly imperative aspect by installing the mechanical ventilation mainly in the kitchen, toilet and basement room. The main objectives of the mechanical ventilation are providing the fireproof property, cooling of individual room and filtering of tiny substances. Furthermore, it can also conserve the sustainable amount of oxygen needed ( maintain at 21% volume of air) and eliminate the carbon dioxide. A portion of data are needed to assemble in order to provide us the advices in accomplishing the foundation of the building services and also leading it in greeneries way since we are doing research on Tower B.


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2.5 INTRODUCTIONS AND FUNCTIONS

In PJ Trade Centre, the air conditioning system and mechanical ventilation are the sources which alternatively vital for providing the sustainable air humidity, air circulation, air quality and also managing the temperature of air inside the building. The installation of the mechanical ventilation and air conditioning system should be ‘ reasonably efficient ’ regarding the Building Regulations enforce requirements. Other than that, the utilization of the mechanical air conditioning system for the buildings is minimal since the PJ Trade Centre Building is more focusing on the greeneries concept and maximize the uses of natural ventilation. 2.5.1 COMPONENTS INVOLVED IN THE MECHANICAL VENTILATION SYSTEM Ducting System

In PJ Trade Centre, it has became a trend by exposing the ducting systems and making it visible since it is quite aesthetically pleasing appearance instead of hiding all from our sight. The main functions of the ductwork is channeling of the air outside towards the indoor space or from the indoor space towards outside. The components that involved in the duct system includes the return air grilles, diffusers and fire dampers.

In the PJ Trade Centre Building, all the ducting system utilized are normally

insulated in order to minimize the installation cost and the heat loss. Besides, the ductworks extend from Air Handling Unit (AHU) to the allotted space mainly basement parking in PJTC. In addition, when the operator been switched on, a loud sound could be produced and heard. A rectangular shaped ducts with a size range of 1m x 1.5m are utilized in the ducting system in the building.


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There are couples of Axial Fan behind the Air Handling Unit (AHU) for the purpose of exhausting air from AHU through the ducting system. It consists of a number of aerofoil cross sections blades assembled on a motor driven central shaft.

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The axial fan in the ductwork can develop a high pressure and provide the moving of air throughout the long section of ductwork.


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Extract Ventilation In PJ Trade Centre, setting up of the extract ventilation in a fire pump chamber provided with the ductworks that linked to the extract fan can furnish the room with fresher air. Moreover, preventing of the cross-flow of odours, noise and smoke is also one of the main function of the extract fan.

The Extract Ventilation System in the PJ Trade Centre.

The Extract Ventilation System airflow directions & components.

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Diagram showing the example of air escaping through Extract Ventilation in high rise building.

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The centrifugal fan, fire damper and circular ductwork location in PJ Trade Centre.

Pressurization & Exhaust System in Fire Protection System

The prevention of leaking smoke flowing through enclosed doors into the stairs area by feeding clean air into the enclosure of stair is the main function of the system provided that the pressure at the adjacent fire compartment is lower than the pressure in the stairs area. Hence, the airflow will be maintained by the system via the open doorway if the stair door is opened. This also helps in the prevention of contamination of the stair enclosure and the opposition of the flowing of smoke. The system is widely applied to enhance the protection of the stairways area for the safety of the owners in the PJ Trade Centre.

There are three components that include in this system. The first component is the Supply Air which is to transport the air to a specific space. Secondly, there is the Pressure Relief which is to avoid the pressure from exceeding the limits. Next is the Air Release which the smokes and air are discharged from adjacent fire area. It develops a positive pressure difference because of having these components and the prevention of smokes from entering the lobbies and staircase area in the building is then established.


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Other than that, the distance of the separation from the edge of the exhaust

louvres housing to the supply air fan should be at least 5 metres. So, it provides a prevention of the smoke from having a potential to shift into the supply air shaft. A motor fans which can suck the air into the stair are installed as well. The motor fans are positioned in the basement in the PJ Trade Centre. A cover up with has the particle filter is available to captured the outside air.

Fire damper located at the emergency staircase area.

This is the emergency staircase area in PJ Trade Centre.


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Ductworks for channeling the smokes during a fire event.

Centrifugal Fan on the rooftop of the building.

The propeller fan in water system room.


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The propeller fan and fire damper location in PJ Trade Centre.

2.6 Types of The Air Conditioning System

In the PJ Trade Centre building, there are consisting of four different blocks of building which is Tower A, Tower B, Tower C and Tower D. They are utilizing the centralized unit air conditioning system except for the Tower B due to there are less occupants own the building units. This also leads to the less assumption of air conditioning system compared to the other three blocks. To resolve the problem of paying the high cost of electrical bills for the low usage of the air conditioning system in Tower B, the split air conditioning system is then installed in the building. This decreases the electrical bills that needed to pay by the few occupants in the building. Whereas, the other 3 blocks are using the centralized air conditioning system. 2.6.1 Split Unit Air-Conditioning System The split unit air conditioning system has been widely utilize by people nowadays due to its silent operation properties, elegant outer appearance and the elimination of making a hole in the walling of the room. The ‘split’ means the separation of the indoor unit ( condenser ) and the outdoor unit ( compressor ) which one is located in the room and one is located outside the room. There are multiple indoor units for some of the models which using of only one compressor, it is known as the multi split air conditioning system.


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http://www.thermospace.com/ductless_split/installation_pic.gif

There are consisting two parts of components for the split unit air conditioner which is the outdoor unit and the indoor unit. The outdoor unit will be located at the outside of the room or space. It is like a chamber that containing the condenser, expansion valve and compressor. In the other hand, the indoor unit includes the cooling coil and evaporator. The split unit air conditioner has the ability to cool the air condition within one or two rooms. One of the advantage of this system is to prevent making any slot in the walling system of the room.

The operation is to re-circulate and recycle the existing indoor air instead of renewing or supplying the fresh air to the room or space since it is a ductless split unit system. It is usually utilized for small space or room area. They are utilizing the indoor unit types in Tower B.


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2.6.1.1 The Components of The Split Unit Air Conditioning System. There are two separate components that available in the split air conditioning system which is the indoor and outdoor units. Initiation of the cooling process will be carried out by the compressor in the outdoor unit whereas the components that house in the indoor unit are fan and evaporator. There are a connection between the two units by a set of electrical wiring and tubing system which transfers electricity and the air. It is a very energy efficient cooling system and preferred by the people nowadays with the elimination the needs of the ducts property. For the mean of saving energy, the energy will loss up to thirty percent from the transferring of air through the duct. There are some components consist in the split unit air conditioning system,;- (1) Indoor Unit The components that are housed inside the indoor unit are the cooling or evaporator coil, filter and long blower. The chilled Freon fluid will enter the cooling coil after going through from the expansion coil. The filtered, hot and humid air is then sucked out from the room by the blower and blows it through the cooling coil. The temperature of air will reduce drastically and the excess moisture of air will also lose after it passed over the cooling coil.


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Example for the indoor unit ac in PJ Trade Centre building:

Ceiling mounted type.

Wall mounted type.

(2) Outdoor Unit The main source of noise produced is from the compressor. Since it is located at the outside of the room, the noise produced by it can be easily eliminated from the occupants inside the room. There is a compressed Freon gas in the condenser and requires a fan to blow air over it and cool the gas. The gas are passing through the expansion coil and converted into low temperature partial gas, low pressure and partial liquid Freon fluid.

The outdoor unit ac of the PJ Trade Centre.


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(3) Compressor Compressor represent the main spirit of any air conditioning system. Before it is sent to the condenser by the external power, it is used for the compressing of refrigerant which is in low temperature and the increasing it to a high pressure. The boiling point will be raised to a higher levels by the conversion and the heat brought in by the outdoor air can be also eliminated by the facilitation. (4) Condenser The gas at high temperature and pressure is received by the condenser from the compressor. The gas is also cooled to change its status and turn into the liquid form by the metallic surfaces in the air-cooled condensers. Production of the same cooling effect by the water circulation will be carried out in the case of water-cooled condensers. Since the rate of conduction of it is considered high, the material to make the tubing will be copper. Besides that, aluminium fins is also covered the condenser so that the removal of the heat from the refrigerant can be established at a faster rate. (5) Evaporator Absorption of the heat from surrounding and replacing it with the cooled air will be carried out by evaporator for this system. (6) Capillary Tube Capillary tube is considered as a simple refrigerant liquid metering application that controls the flow of refrigerant from the arriving high pressure side ( condenser or compressor ) into the low pressure side ( cooling coil ). (7) Expansion Valve The expansion valve is generally considered as a capillary tubing made from copper with a number circular coils. The greater capacities thermostatic property of the expansion valve in the split air conditioners is utilized which is run electronically automatically. The medium temperature and high pressure refrigerant discharge from the condenser and moves into the expansion valve, where there is a sudden dropping of its pressure and temperature.


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2.6.2 OPERATION OF SYSTEM

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The missions of the split unit air conditioner are the pumping the heat outside the room or space and transferring it to cooling when it runs through the cycle of refrigeration. The refrigerant will experience the changes of the phase, changes of temperature and the changes of pressure when the refrigeration cycle is took placed. How does a split unit air conditioner work ? The process is begun with the compressor that is run through a thermostat inside. The thermostat operates the compressor at the outdoor once it detects the warm air. Furthermore, the circulation of refrigerant gas, rising of the temperature and pressure of refrigerant by the compressor will be taken place as it compressed via a chains of pipes. The refrigerant is then transferred to the condenser for other operation. On the other hand, a cooling system eliminates heat from the high pressure gas and the gas transforms into liquid in the condenser. The indoor tubing pushes the chilled liquid until it arrives to the evaporator system.


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The warm air is collected by the evaporator fan inside the building and is passed through a chamber that contains the chilled liquid refrigerant. Moreover, the blowing process of the now-cooled air returns into the room by the fan system and decreasing of the overall temperature of the room will be served. The process will be continuously repeated if there is a detection of the warmer air compared to the desired air by the thermostat. Besides that, if there is any excess heat or the refrigerant remains in the system, the flowing back process will begin to the compressor outdoor so that a new cycle can be begun. 2.7 UBBL REQUIREMENTS AND REGULATIONS. Under UBBL 1984 Section 41 : Mechanical Ventilation and Air-Conditioning.

1. The place where the everlasting air-conditioning or mechanical ventilation is deliberated, the applicable fabricating by-laws identifying with the natural lighting, natural ventilation and the height of spaces or rooms might make waived In those carefulness of the neighborhood power.

2. Whatever provision for the waiver of the pertinent by-laws should be a chance

to be considered if What's more of the permanency air-conditioning framework there is given elective affirmed method for ventilating those ventilated enclosure, such-and-such inside half an hour of the air-conditioning framework failing, not under those stipulated volume from claiming new air specified hereinafter should be acquainted under those nook Throughout those time At the air-conditioning framework is not working.

3. Those procurements of The 3rd Schedule to all these By-laws might apply to

edifices which are air-conditioned or mechanically ventilated.

4. The place permanency mechanical ventilation On appreciation of lavatories, bathrooms, corridors or water-closets, will be furnished for· What's more supported over understanding for those prerequisites of The 3rd Schedule to these By-laws, the procurements about these By-laws identifying with regular ventilation Furthermore regular lighting ought not apply should such water-closets, corridors, bathrooms or lavatories.


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3.1 PROLOGUE In Malaysia, the fire problem has become getting serious and important issue. We must always aware to the hazard of fires to ourselves to prevent this situation happens. This is because it may cause a serious consequence to all of us such as it will cause damages to people, vehicles and properties. For example, fire in buildings is a major risk to kill our lives, it will destroy the buildings and also causes loss of lives. Fire protection shall be fully equipped in every building or shopping mall. It shall be installed, operated and maintained in a functioning condition at all times. The fire protection in every building and shopping malls are required and apply to the design of the building.Fire protection systems is the basic requirement in a building. The system is used to ensure the building fully capable to withstand for the fire to be controlled The fire protection systems consist of two components which are active fire system and passive fire system. Both active fire system and passive fire system have different function in the fire protection system. It is important that both fire system to work together in an event of fire because they are playing different roles to prevent and minimize the risk of fire. 3.2 ACTIVE FIRE PROTECTION SYSTEMS What is active fire protection? Active fire protection is the process of protecting a building from fire with the component of fire detection and prevention which reacts to action or motion. It is one of most important elements to consider when building modern structure.The role of active fire protection is to detect,alert about, and seek to eliminate any potential fire hazards, in order to provide a safer and more protected environment for people to making use of them. 3.2. 1 Manual Initiating Devices Manual initiating devices should be located near the exits of the building. It should be easily accessible, operated and identified.

Fire Break Glass Alarm


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The PJ trade centre fitted with “Fire-Break Glass Alarm”. It allow occupants to activate the fire alarm and the Fire Brigade is alerted easily. The red panel on the wall houses a small button. When the small button depressed, it will contact the Fire Brigade and Fire Brigade will respond instantly to the building.The glass of the red panel is easy to break and sometimes smashing the glass will activate the button automatically. 3.2.2 Automatic Initiating Devices Automatic initiating devices will all sense changes in the environment. It will react automatically in the event of an emergency. 3.2.2.1 Smoke Detector Smoke detector is an indicator of fire which detects smoke. It is typically housed in a disk-shaped plastic enclosure.Smoke detectors in large commercial are powered by a central fire alarm system, which is building power with battery backup. TYPE OF SMOKE DETECTOR

Ionization smoke detectors Can quickly detect the small amount of smoke product by fast flaming fires.(cooking fires, flammable liquids, fire fueled by paper)

Photoelectric smoke detectors Respond faster to afire in its early, smoldering stage before the fire burst into flames. (large combustion particles)


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The detection system in PJ Trade Centre may sense smoke in the building. Because of the function of earlier warning of an emergency situation, smoke detector are increasingly being used. It may also used to activate fire doors to isolate zones in the building. The smoke detector can activate the alarm system as well as sprinkler system.

Fire Intercom Panel

Fire intercom system provides consists of remote handset station and Master control panel.It provides communication between Fire Command Centre and remote Handset Stations. The system is installed at the Fire Control Room in PJ Trade Centre.

3.2.3 ALARM SYSTEM 3.2.3.1 EMERGENCY VOICE COMMUNICATION SYSTEM

Telephone During the fire outbreak,it used to communicate to the Command Centre or nearby fire station directly by the telephone provided. It is located at staircases of each floor in PJ Trade Centre.


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Speaker PJ Trade Centre use this speaker for Emergency Voice Communication System. Pre-recorded messages will be used and it is access be used to communicate to people nearby the exits during fire outbreak.

Fire alarm panel It located on the ground floor near the entrance. The panel is in a cabinet on the wall and there are a number of lights and buttons. Fire sensors in the building have activated the lights. When one of its sensor locates a fire, this FIP will automatically notify the Fire Brigade of an alarm. It talks to EWIS and notify the building occupants that they need to evacuate.

Fireman Switch It is used to switch off the power supply from certain power system of PJ Trade Centre. It can be found in every level of the building and it have different types of electrical supply switches. The switches can only be turned off by the fireman.


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3.2.4 FIRE CONTROL SYSTEMS 3.2.4.1 SPRINKLER SYSTEMS The commercial buildings need to have protection in case of fire or smoke. Sprinkler system installation is good preventative measure to take and water represents the ideal extinguishing agent. Sprinkler systems are most effective during fire’s initial flame growth stage while the fire is easy to control. The sprinkler head has a liquid filled glass bulb breaks due to the fire and as a result the sprinkler will release water to spray over the fire. How do sprinklers operation?

1.) During the initial fire stage, the heat output is relatively low and not able to cause sprinkler operation.

2.) As fire intensity increase, the sprinkler sensing elements become exposed to elevated temperatures which typically in excess of 57-107 degree celsius, the sensing elements begin to deform.

3.) During the increasing fire and the temperature remain high, the element will fatigue after an approximate 30 to 120 second period.

4.) The sprinkler seals was released and the water was allowed to discharge onto the fire, the suppression action. begin.

There are various types of sprinkler head can be found in PJ Trade Centre. In different places, each sprinkler head has their different function.It can be found in the entire PJ Trade Centre easily.It is a component of fire sprinkler system that discharging water when detect the effect of a fire


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Upright Sprinkler Head It can be found in the mechanical area and basement of PJ Trade Centre. During a fire, upright sprinkler head can function when there are obstructions around the water spray. It is upright so it can aim water effectively.

Pendent Sprinkler Head

Although the water spray are minimal, we can found that there are some of them installed in few places in PJ Trade Centre.

Fire Pump

It is fire sprinkler system’s water supply that can be found in PJ Trade Centre’s fire pump room.


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3.2.4.2 FIRE HOSE REEL SYSTEMS Hose reel system can be found most around the stairways and electrical room of PJ Trade Centre. It consists of pumps, pipes, water supply and hose reel which ensuring proper coverage of water to combat a fire. Fire Hose Reel

Fire Hose Reel with between 18 and 36 metre hose which has `13mm ,19mm, 25mm internal dia are fitted on the wall. It is supplied with a fast fit mounting bracket, an inlet pipe with thread and stop valve. Fire hose reels are located at reasonably accessible places in PJ Trade Centre which provide the supply of water to combat fire risk, especially for the occupants who are trapped in the building and cannot escape to emergency exit when fire outbreak.

Hose Reel Operation

1) Make sure the jet and nozzle is in the closed position

2) Turn on the main control valve 3) Break glass of glass fronted cabinet and reel out

the hose toward the fire 4) Open the valve or nozzle and the stream of

water is directed at the fire from a safe distance.


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3.2.4.3 WET RISER SYSTEMS Typical Wet Riser Installation

Fireman use wet risers as a form of internal hydrant. Wet risers are always charge with water and only required for buildings where the topmost floor is higher than 30.5 meters above the fire appliance access level. Wet riser system comprises duty fire pumps with standby pump discharging into riser pipe with landing valves at each level except the ground. The pipe system is connect to permanent water supply which fed from the town mains.

Wet riser system is a system of rigid piping which can be found in PJ Trade Centre. In PJ Trade Centre, dry riser system cannot be used because the building is too tall and it cannot manage to rely the building codes. Therefore, wet riser system is a better choice and it provide water towards the floors.


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Jockey Pump

A jockey pump is usually provide to maintain system pressure.Jockey Pump is the first pump to start. The controlling pressure switch is set to start at a pressure of 150 psi and set to stop at a pressure of 230 psi. If wet riser piping(wet riser/hose reel) have a small leak exist, the pump will start in order to compensate for the leak.

Pressure Gauge

Pressure gauge most common pressure measuring devices to check the pressure by compressed gas or liquid. When identify it has high pressure, it should have potential safety threats.

Fire Alarm Control Panel

This is fire alarm control panel which receive information from environmental sensors. It is designed to detect changes associated with fire and monitors their operational integrity. Besides that, it provides transmission of necessary information and automatic control of equipment for preparing the facility for fire.


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Alarm Valves The 4 towers of the PJ Trade Centre has different types of alarm valves and each has match with different installation systems such as dry pipe system,wet pipe system etc.This is valves prevent a reverse flow of water from the installation. It is located outside fire pump room and it will open and allow the water flow into the system. In the meantime, the fire pump will receive a signal from a pressure switch.Contrary, it is normally close for the technician to get maintenance for the valves.

Sprinkler Valve and Wet Valve

Two of these valves include pressure switches and valve monitors.


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3.2.4.4 CARBON DIOXIDE SYSTEMS 3.2.4.4.1 CO2 SUPPRESSION SYSTEM CO 2 suppression systems extinguishes fire by lowering the level of oxygen or removing oxygen to cut the fire. The mechanism of fire suppression makes CO2 suppression requiring minimal clean up and highly effective. It is used in unoccupied hazard locations and avoided by personnel when discharged.Cylinder valves can be open automatically by remotely using electric ,or manually by using mechanical valve actuators. CO2 storage

In PJ Trade Centre, CO2 suppression system is used in some places that have high risk of fire outbreak such as electrical room and generator room.


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3.2.4.4.2 Portable Fire Extinguisher Portable fire extinguisher apply an extinguishing agent that will stop fire from burning either displace or remove oxygen, cool burning fuel or stop the chemical reaction. The agent is expelled out the nozzle when the handle of an extinguisher is compressed.

How it operation? It can described by the acronym “PASS ” 1. P -The safety pin is pulled. 2. A - The nozzle is aimed at the based of the fire from a safe distance 3. S -The handles are squeezed. 4. S -The extinguisher are swept from side to side while aiming a the based of the fire. CO2 Fire Extinguishers

CO2 fire extinguishers can be found in PJ Trade Centre. Carbon dioxide extinguishers contain pressurized liquid carbon dioxide which turns to gas when expelled.It can extinguish Class B and Class C fires. However, it has no post fire security and the fire could re-ignite.


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Classification and Use Fire extinguishers are classified by the type of fire that they will extinguish. 1) Class A fire extinguishers

Ordinary Combustibles: It is used for ordinary combustibles (such as paper, wood, plastics and textiles) and it

requires the heat-absorbing effects of water or the coating effects of certain dry

chemicals.

2)Class B fire extinguishers

Flammable liquids:

It is used for flammable liquid and gas fires (such as oil, gasoline, etc. ) It deprive the

fire of oxygen and interrupt the fire chain by inhibiting the release of combustible

vapors.

3)Class C fire extinguishers

Electrical Equipment:

It is used on fires that involve live electrical equipment that require the use of

electrically nonconductive extinguishing agents. Once the electrical equipment is

de-energized, extinguishers for Class A or B fires may be used.

4)Class D fire extinguishers

Combustible Metals

It is used on combustible metals (such as magnesium, titanium, sodium, etc.), that

require an extinguishing medium that does not react with the burning metal.


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3.3 PASSIVE FIRE PROTECTION SYSTEM Passive fire protection is the use of fire protection systems that are applied into the structure of a building. Their purpose is to contain fires and slow the rate at which they spread efficiently for people to escape immediately in the event of fire. They also used to protect load bearing columns and other critical structures through fire-resistance walls, floors and doors to prevent the building collapsing during fires. By making a fire resistant compartment between rooms and floors, passive fire protection greatly slows down the spread of the fire from the room where it originated. This is to reduce the amount of damage to the building. In addition, this will provide more time to the building’s occupants to leave the building and arrive a more safety place. The passive fire protection is different from active fire protection which it does not require any action or motion or to be activated by electronics. There are few example for passive fire protection such as fire door closers, means of escape, fire curtain and fire dampers. 3.3.2 Opening Protection 3.3.2.1 Fire door

A fire door is an important part of a building’s passive fire protection system. The doors provide life safety by providing people to escape quickly when necessary and it also stop the spread of fire, smoke and toxic gases. This fire door requires a proper installation and maintenance is a critical part of the building fire protection system. Still, the requirements remain a mystery for many architects and specifiers.


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Photo of a door closer 3.3.2.2 Types of door openings


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Example of one hour rating


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Example of two hours rating 3.3.2.3 Fibre Reinforced Plastic Door


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Fibre reinforced plastic (FRP) door can be found at the external opening of the building. It can be perform well in high corrosive area. A FRP door consists of fire resistance composite that can be used in the opening rated up to one and half hours. It is also protected by fire curtain. 3.3.3 Lighting and Signage 3.3.3.1 Emergency Exit An emergency exit is an another exit in a building that can be used in case of emergency in an event of fire. The purpose of emergency exit is to allow people to leave the building in a faster way or shortest time because when a building in fire, it may block all the normal exits. It is usually placed on the above of the fire exit door where it is clearly visible. 3.3.3.2 Emergency Evacuation Plan


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Emergency evacuation plan is to provide immediate and urgent movement of people away from the risk or real incidence of a danger. The purpose of an emergency evacuation plan is to facilitate and organize employer and employee actions during workplace emergencies. An emergency evacuation plan can be found on the wall nearby the lift of every floor. Based on the plan, it is clearly stated that the location of emergency staircase, fire extinguisher, bomba lift and fire alarms. It is to provide the people to find the emergency ways to leave the building in the fastest way. 3.3.3.3 Fire exit signs Fire exit signs with arrows is used to guide people to the emergency exits and staircase. It is usually placed at points around the PJ Trade Centre to provide information to tell people where should they go during in an event of fire and emergency situation. It is usually green and white in colour. This combination of colour is to tell people that it is a safe condition. It will also shows a pictogram of “ running to the door” on the sign.


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3.3.3.4 Fire Indicator Light

Fire indicator light can be found at PJ Trade Centre. It is usually placed above the entrance of every high risk room. It is used to tell people the safety status of a room before entering to the room. It will provide a notification to people by using different colour light, to tell people when they are in any emergencies. A fire indicator light contains of a green and red light bulb. A green light bulb is light up is to tell the users it is safe to enter the room while a red light bulb is light up is to tell the users that the room is in a dangerous situation. It is used to prevent people to enter into the room when it is in the dangerous situation. 3.3.4 Fire curtain


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A fire curtain can be found at the entrance of PJ Trade Centre. A fire curtains require side guides to provide a cover between the fabric and the structure of the building. The main purpose of fire curtain contains of smoke and it is used for 1 hour fire rated curtains is generally used for smoke curtains. This system is placed at every generator room in PJ Trade Centre. 3.3.5 Fire escape staircase

A fire escape staircase can be found at every floor in PJ Trade Centre. The fire escape staircase is used to allow people to escape to a safety place or outside of the building during emergencies and in an event of fire. It is not allowed to use the elevator when fire is in a building.


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3.4 UBBL By Law Requirements ACTIVE FIRE PROTECTION SYSTEMS UBBL By laws - Section 153 - Smoke Detection

- Smoke detectors are required in all lift lobbies

UBBL By laws - Section 225 - Fire Detection

- Fire alarm are provided together with highlighted exit signs to detect and

extinguish every buildings

UBBL By laws -Section 237- Fire Alarms

- Accordance with the Tenth Schedule to By-laws, fire alarm need to be

provided.

- Two stage alarm system are provided if the gross floor area in the buildings

exceeding 9290 square meters or exceeding 30.5 meters in height, excluding

car park and storage areas.

- For general evacuation of the premises, provisions shall be made by action of a

master control.

UBBL By laws- Section 238

- Sprinkler valves must be located on the exterior wall which is safe and

enclosed position. It should be accessible by Fire Authority

UBBL By laws -Section 239- Voice Communication System

- Two voice communications systems-Fire brigade communication system and

other public address system should separated approved and electrically

supervised.

(a)staircases, lifts, lifts lobby and corridors.

(b)The size of every office exceeding 92.9 square metres

(c)Fire brigade system combined with public address system in each dwelling unit

UBBL by laws- section 240 - Electrical Isolation switch - Electrical isolation switch are provided when size of zone of any floor

exceeding 929 square meters. It is located within staircase enclosure to permit

the disconnection of electrical power supply.

- Fireman’s switch must be similar with the specified type

UBBL by laws - Section 228 - Sprinkler valves


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- Sprinkler shall be readily to the fire authority therefore is located in safe

enclosed position on the exterior wall

- To provide automatic relay and immediate of alarm when activated, all sprinkler

system shall be connected to the nearest fire station.

UBBL By Laws -Section 231- Installation and testing of wet rising system

- Topmost floor of every building must provide wet rising systems when

exceeding 30.5 meters above fire appliance access level.

UBBL By Laws -Section 248 - Marking on wet risers

- Wet riser and sprinkler shall painted red.

- All fire installations that recessed in wall shall be clearly identified to fire

authority

UBBL By Laws - section 227- Portable extinguishers

- Portable fire extinguisher must be positioned visible on exit routes and

provided with relevant codes of practice.

PASSIVE FIRE PROTECTION SYSTEMS UBBL By laws - section 10 - No obstruction in staircases 1) There might be no obstacle in any staircase between the highest landing there and the exit discharge on the ground floor. UBBL By laws - section 164 - Door closers for fire doors 1) The automatic door closers of hydraulically spring operated type can fit with all fire in the proper sequence. 2) To ensure that leafs close in the proper sequence, the double door shall be provided with the coordinating device. 3) Fire doors might be held open provided the hold open device incorporates a heat actuated device to release the doors protecting openings to protected corridors or protected staircases. UBBL By laws - section 110 - Exits to accessible at all time 1) Except as allowed by law 167 at the very least two separate ways out might be given from every story together with such extra exits as might be necessary.


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2) The exits should be sited and the leave get to might be arranged to the point that the ways out are with the breaking points of travel separation as determined in the Seventh Schedule to these By-laws are promptly available at all circumstances. UBBL By laws - section 168 - Staircases 1) Except as allowed for in by-law 194 every upper floor shall have means of way out via at least two separate staircases. 2)Staircases should be of to such an extent that in case of any one staircase no being accessible for escape purposes the rest of the staircases might suit the most important occupancy load of any one story releasing into it figured as per arrangements in the Seventh Schedule to these By-laws UBBL By laws - section 172 - Emergency Exit Signs 1) Story exits and access to such exits should be set apart by promptly obvious signs and might not be covered by any decorations, furnishing or other equipment. UBBL By laws - section 198 - Ventilation of staircase enclosure 1)All staircase restricted in areas should be ventilated at every floor or landing level by either permanent openings or operable windows to the outside having a free area of at least 1 square meter for each floor. UBBL By laws - section 217 - Fire resistance of structural member 1) Fire resistance of not less than minimum period shall required by any structural member or overloading wall required by-laws for any element which it carries. UBBL By laws - section 222 - Fire resistance for walls 1) Other than external wall, enclosing a protected shaft shall, if every side of the wall is independently presented to the test by fire, having imperviousness to fire for at the very least time frame required by this part.


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4.0

MECHANICAL TRANSPORTATION SYSTEMS

4.1 LITERATURE REVIEW


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Mechanical transportation systems are the vertical transportation system which allows goods or people to move efficiently from floor to floor or between decks and levels of a building. These mechanical transportation systems are classified as escalators, travelators and elevators which are known as lifts. In PJ trade centre, they are using elevators only throughout the whole building. They do not require escalators as this is an office building which consists of 21 floors. Mechanical transportation system is usually used in a building to transport goods or passengers from floor to floor within a building. Elevators or lifts are used to transport vertically in a building. A set of staircase will be designed to the buildings that consists more than one storey. It is counted into consideration when they are designing the building because it is used to allow occupant or user in the building to travel from floor to floor. In accordance to Malaysia Uniform Building By-Laws (UBBL) 1984, clause 124: Lift is required for all non-residential buildings which are exceeding 4 storeys and above or below the main entrance. If the buildings that is not exceeding 4 storeys but there are seniors or disabled access, lifts are required as well. Other than clause 124, it must fulfill the requirement of Clause 153 in UBBL as it state smoke detector must be provided at the lift lobbies in order to detect if there is any fire occurred. Elevators are powered by electric motors. It is activated by driving traction cables or counterweight systems, for example: hoist. The hydraulic fluid will be pumped to raise the cylindrical piston. Quality of the elevator is an important factor in the choice of tenants. Elevator performances mostly are depend on speed of door operation, acceleration, car speed, stability of speed and performance with variations of car load. In PJ Trade Centre, there are 21 floors and traction elevators are used throughout the building. They are allowed to transport goods or people by using traction elevators. It can carry high loads compared to other type of elevators. Hoist mechanism is used in traction elevators. Hence, there are some types of hoist mechanism elevators:

I. Traction elevators II. Pneumatic elevators III. Hydraulic elevators IV. Climbing elevators


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4.2 ELECTRIC TRACTION ELEVATORS PJ Trade Centre is a high rise building which consists of 21 storeys. Hence, the speed of and efficiency of the elevator are very important. Electric traction elevators are used throughout the whole building. In more specific term, it is using geared traction elevators. Electric traction elevators have the ability to carry higher load which due to the height of the building. It provides efficiency and speedy properties to the occupants.


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Figure 1: Location of elevator in PJ Trade Centre

4.3 COMPONENTS There are some important components can be found in the lift motor room which is located at the highest floor. There are control valves, drive motor, controller and counterweight.


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Lift Car This is known as car of the lift. It is made of fire resistance material. The car is supported on a structural frame to which the lifting cables are attached to a top member. The car is guided by the guide shoes on its side member guide during vertical travel in the shaft. This car is equipped with ventilation, operating control system, safety doors, emergency exit, illumination and floor level indicators. The capacity of this car is 1365 kg and maximum passengers occupied are 20 persons. When the lift is broken down, the ventilation and light are still functioning. It can withstand for two hours in order to wait for technician to arrive.

Cables There are lifting ropes or cables in the lift in order to function the lift. There are groups of steel wires that are designed to carry and support the weight of the car and allowed to move from floor to floor. The cables are attached to the crosshead which is known as the top beam of the elevator. The cables are depending on the car speed and the capacity of the car. If there is an emergency happened in the lift, for example, the one of the lifting ropes in the lift has broken, the car will not fall to the lowest floor because there are emergency brakes that will brakes the car immediately. There will be other lifting ropes in the lift as well to support the car, so that there will be no accident happened to the lift and the occupants are safe. There are about four to eight cables in each lift to support the weight of the car with occupants.


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Geared Traction Elevator Geared traction machines are interposed between the hoisting sheave and driving motor. The electric motor in geared traction elevators is used to drive gear type reduction unit which allowed turning of hoisting sheave. It can be used for car speed up to 2.3m/s approximately. There is an electrical controlled brake between reduction unit and motor in order to stop and hold the car at the required floor level. A geared traction machine will gives accurate, smooth ride and high quality to elevator with appropriate drive and control system.

Counterweight Counterweight is made by cut steel plates which staked in a frame and attached to the opposite ends of the cables which are fastened to the car. The car is supported by the counterweight which the weight is almost same amount when it is loaded half full. It is located in the shaft and set into the wall of the shaft by two guide rails. Counterweight helps to reduce the energy cost and power demand. It also provides adequate traction at the sheave for the car of the lift.


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Shaft Shaft can be known as hoistway as well. It is basically the vertical passageway for the car and counterweights of the lift. There are guide rails on the walls of the shaft for counterweight. There are car and counterweight buffer at the bottom of the shaft which can be known as pit as well. The top of the shaft is designed as structural platform to support the machines of the elevator. The elevator machine room usually required one or two levels and it is located directly top of the shaft. Traction machine and some control system are located in the elevator machine room in order to activate the elevator. Hence, they are designed for vibration-free operation and quiet.

4.4 OPERATING PANEL


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General Control System These are the floor switch numbering for passengers to choose the floor that they wanted to stop. There is also an alarm button which connected to control room of the building. It allows the passengers to ask for help when they are trapped in the elevator. In this elevator, there is some information such as the capacity of the lift which is not allowed to exceed the capacity of the lift to prevent breakdown of the lift. Other than that, there are some controller switches for technician to control and service the elevators. Overload sensor can be found at the door of the lift and it is to prevent the car from exceeding the maximum load. It will trigger the alarm when exceeding the maximum load. Key Switch Panel


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Key switch panel is located at the control room of the building. It can control the car of the lift when there is an emergency or lift breakdown occurs. Also, when lift breakdown, the passengers are able to contact or ask for help from the control through the help button. When emergency or lift breakdown occurs, technicians are able to know clearly where the elevator has stopped through the key switch panel. 4.5 UBBL Bylaw Requirements UBBL By laws - Section 124 - Lift

- Lift is required for all non-residential buildings which are exceeding 4 storeys

and above or below the main entrance.

UBBL By laws - Section 153 - Smoke Detector

- Smoke detector must be provided at the lift lobbies in order to detect if there is

any fire occurred.

UBBL By laws - Section 154 - Emergency Mode

- On failure of mains power all lifts shall return in sequence directly to

designated floor, commencing with the fire lifts, without answering any car or

landing calls and park with doors open.

- After all lifts are parked the lifts on emergency power shall resume normal

operation: provided that where sufficient emergency power is available for

operation of all lifts, this mode of operation need not apply.


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5.0 Electrical Supply System 5.1 Literature Review Tenaga Nasional Berhad (TNB) and Independent Power Producers (IPPs) in the Peninsular Malaysia are using a Gird Code as main guidelines in electricity supply operation in order to make sure the electricity supply in Peninsular Malaysia are always reliable. The Grid Code and also the Distribution Code stated the responsibilities of parties that involved in managing the electrical supply system. Example of the responsible parties are generators, grid system operators, distribution system operators, single buyer and also the large power of consumer.

Structure of the Power System, responsible parties and applicable codes So, how TNB generate, transmit and distribute the electricity to all the consumer? The four main components that make up the electricity grid are generation plants, transmission lines, distribution substation and consumer use.


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The process of power supply from generation to end-use customer

There have varies type of power plant are used to generate electricity. For example, coal and nuclear power plants have less flexibility to adjust their electricity output which means it consume more time to step up or step down the electricity. Natural-gas fired plants can be ramped up faster and it often used to cope with the high demand. However, in Malaysia, we heavily use natural gas and coal to generate electricity because our country is rich on both resources. Next, transmission system is essential as it transmit the electricity from the generators to the distribution substation. Transformers are required to convert the low voltage electricity which generate by the power plants to high voltage electricity in order to reduce the loss of electricity during the transmission process over the long distance. Transmission lines are made by aluminium alloy and reinforced with steel and it can be overhead power lines or underground power cables. Typically, the transmission level voltages are at or above 138kV and the transmission system and carry up to 765kV. Besides, the distribution substation is where the transmission lines end and pick up by the distribution network. The distribution network start at the transformers which step-down the voltage of electricity from transmission lines and distribute the electricity to all the consumer from the area of heavy and light industry, commercial and residential.


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The diagram above has shown the electric supply system from the generators plants which generate 25 kV electricity and then step-up the voltage to 230/138kV and transmits through the transmission lines until the distribution substation. The transformers from the distribution substation step-down the voltage to 33Kv. After that, the electricity transmits through the sub-transmission lines and reach the TNB room which located at the basement of PJ Trade Centre and step-down the voltage to 11Kv which consider as medium voltage. If for residential area, it only required 400/230 volts which consider as low voltage.

The table shows the classification based on voltage levels.

The diagram shows the location of electrical room at PJ Trade Centre.


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In this section, we will introduce and explain the function of every electrical room such as TNB Room, Main Switch Room, Low Voltage Switch Room and Gen Set Room which located at the Basement 7 in Tower B of PJ Trade Centre. All the electrical room are located at the same area to reduce the loss of voltage over the distance travel. Moreover, we also will discuss about the process on how the electrical generate from the generator plants distribute throughout the building.

Besides, we will also explain about the design consideration through our observation when we having the site visit there. For example, for safety reason, each electrical room has an alternative emergency exit door and also carbon dioxide fire extinguisher to reduce fire losses especially human life. Lastly, we will discuss about the UBBL 1984 law that the PJ Trade Centre included in their design of all the electrical room.

5.2 TNB Substation


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The diagram shows the location of TNB Substation (orange colour) on the plan view. Substation is an important part in the electrical supply system as it links between generating station, transmission systems, distribution systems and the load points. The TNB Substation of PJ Trade Centre is an indoor substation and it is located at Basement 7 in Tower B. TNB Substation consists several electrical components such as power transformers, bus bars, switchgear and more. Bus bars is an electrical conductor that carry a large current from the generator plants or distribution substation. It is a thick strip or tube that made up of copper or aluminium. The main function of TNB Substation is to protect the transmission system, control the exchange of energy, make sure the transient stability, maintain the system frequency within the target limits and provide sufficient line capacity to secure the supply. Besides, the TNB Substation also able to determine the energy transfer through the transmission lines and it is a reliable supply by feeding the network at various load point. The types of substation can be classified in several ways which shows as following:

1. Classification based on voltage level. 2. Classification based on outdoor or indoor. 3. Classification based on configuration. 4. Classification based on application.


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5.3 Main Switch Room

The diagram shows the location of Main Switch Room (yellow colour) on the plan view.


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Main Switch Room Schematic Diagram

Incoming from Kepong Incoming from Klang

The electrical source for PJ Trade Centre comes from Kepong and Klang. In PJ Trade Centre, the main switch room is basically used to receive the electrical supply from TNB room and distribute it to every level of the building. Switchboard is a combination of several electrical panels. Each electric panel consists of switches that used to control the electric circuit and other power control equipment. The main function of switchboards is to receive, control and protect the electrical source, then divide the


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electrical source to smaller chunks and distribute it throughout the building. The electrical source distribute from switchboard will pass through transformer, panels and any other equipment to prevent the loss of electric sources over the distance travelled. Besides, the switchboard mounted several load sharing controls and gauges to control and monitor the electrical supply process. This can make sure the total amount of electrical source received by switchboard is equal to the total amount of electrical distributed. 5.3.1 Main Switch Room components and devices Circuit breaker

Circuit breaker is used at the equipment and machine that received the high volume of voltage. Circuit breaker as one of the important component in switchboard because it provides protection for high current incomers and feeders electrical supply. Besides, the circuit breaker must remain closed connection when short-circuits happened. This is to allow the downstream circuit breaker break down the faults. The circuit breaker functioning by using the time delayed basis. It using the two common method which are Electro Dynamic Withstand (EDW) and high thermal withstand characterised by a short time.

The criteria to settle a suitable circuit breaker:

1. Must comply with standard of BSEN 60947-2. 2. Must have high breaking capacity from 40 to 150 kA. 3. Must have stored energy operating mechanism which allow the source

coupling. 4. Must have shunt trip function.


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Fuses The function of fuses is act as a protection to the electrical equipment by preventing too much current enter the switchboards. Fuse is a low resistance device which will break down the electrical supply under faulty conditions. For example, when the electrical supply more than the desired value, the temperature will increase and cause the fuses disconnect the electrical supply.

Bus bars

Bus bars is a thick tube that made up by copper or aluminium. The bus bars normally act as electrical conductor to carry the high electric current from generation or distribution substation to the switchboards. The bus bars connect from the fuses to carry the high voltage to each section of connected switchboard and energize each section.

Step-down transformers

Transformers within panel box


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For large building such as PJ Trade Centre, more than one transformer is required to step-down the high voltage from the TNB substation. The transformers lower the voltage from 11Kv to 480/277 volts which is the usable level of power supply for the building. After the transformers have step-down the voltage of electric supply, the electric supply will then transmit to the switchboard and distribute to every level of the building. Voltage Light Indication

Voltage light indication is used to show the voltage of the switchboards. For the blue

light indicate the voltage of the switchboards is maintaining the desired level. While

for the yellow light indicate that the voltage level is slightly higher. In this stage, the

authority should take action in order to control the voltage and prevent the

switchboards from burning. If the red light brightens up, it means the voltage level is

very high. In this stage, immediately action is required to find out the problem and

solve it as soon as possible.

5.3.2 Analysis and observation on Main Switch Room

Air Conditioned

The temperature inside the main switch room

must be always maintain at 25°C because it is

one of the requirement of electric room. This is

to prevent the switchboards from overheating.

and prevent the switchboards from damaging.


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Main Switch Room Access

The main switch room door is open outward and it is always locked. This is to prevent

unauthorised person enter the room due to the hazards of high voltage electricity.

Besides, the room of electrical room must be designed to open outward to prevent

obstacle fall and block the door from opening when the electrical room in fire.

Sprinkler Systems

There have total 8 sprinkler heads throughout the

main switch room as it able to detect the high

temperature in the room and spray the water out to

reduce the fire losses and also prevent the spread of

fire.

CO2 FIRE EXTINGUISHERS

There have total 4 CO2 fire extinguishers in the

main switch room. It can be use when the

switchboards heated up and fire due to the high

voltage.


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Equipment hand on wall

The equipment that used to service or repair the switchboards is unique and expensive. Therefore, it cannot be taken away by authority. It should be always hang up on the wall after the use. Unfortunately, the one of equipment in main switch room have loss and they force to use the spare equipment.

5.4 Low Voltage Switch Room


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The diagram shows the location of Low Voltage Switch Room (blue colour)

The diagram shows the location of Low Voltage Switch Room (blue colour).

In PJ Trade Centre, the low voltage switch room is located between the TNB

substation and the main switch room. Low voltage switch room is the optimal solution

to provide a higher functional low voltage distribution equipment which means it able

to protect, control and monitor the electrical distribution systems in a more safety,

efficiently and efficiency way.

The low voltage switchgear is used to provide centralized control and protection to the low voltage power equipment and circuits in the building. It capable to provide


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electrical protection against the overload currents, short circuit currents and also insulation failure. Besides, the switchgear is allowed to control through the functional switching, emergency switching, emergency stopping and the off switch for maintenance or service purposes.

5.4.1 Low Voltage Switch Room components and devices Main Switchboards

There are total five main switchboards that used to separate the power distribution

system into five different zones. One switchboard will distribute the electrical supply to

the first zone which is from the ground floor level to basement 7. While another four

switchboards will separately distribute the electrical supply to from floor level of 1st to

5 th floor, 6 th to 10 th floor, 11th to 15th floor and 16 th to 20 th floor. The electrical disconnect

switch and circuit breaker are used to protect and control each of the switchboards.


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Low voltage drawout power circuit breakers

Low voltage drawout power circuit breakers connect to the primary and secondary

connections without nuts, bolts or connector kits. The main function of low voltage

drawout power circuit is to provide automatic protection to electrical circuit from

damage due to the overload circuit, short circuit currents and insulation failure.

Circuit Breaker Compartments

There have two type of circuit breaker compartment inside the switchboards which

are the horizontal circuit breaker compartments and vertical circuit breaker

compartments. Horizontal circuit compartments used to distribute the electrical power

to every switchboard section. While for vertical circuit breaker compartments are used

to distribute electrical power to every circuit protection device in a single structure.

Primary and Secondary Power Connections

The power connections divided into primary and secondary power. Primary power is

the connections from the main electrical distribution system directly to the load points.

While for secondary power, the connections are made by extending busbars into the

breaker compartments. It is used to connect the main system power components of

the drawout power circuit breaker. Whilst, the secondary power also provide power to

the equipment that use to control and monitor the electrical operation devices.

Secondary Control Compartments

The main function of secondary control compartments is to segregate and protect the

low voltage control and also used to monitor the cables from other areas where the


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switchgear located. It capable to connect devices in various control compartments to

others through the dedicated control circuit wire ways.

Busbars Couple

Busbars couple is made by silver or tin-plated copper. Vertical busbars couple are

connected to horizontal busbars couple and it used to distribute the power from

circuit breakers. The horizontal busbars couple are then distribute the power from one

switchboard to another switchboard.

Overhead Current Transmission Cable

The overhead current transmission cables are used to distribute the power from

switchboards to every level of the building.

5.4.2 Analysis and observation on Low Voltage Switch Room

Air Conditioned & Main Switch Room Access & Sprinkler Systems


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All the electrical room must fulfil the same requirement. Hence, the low voltage switch

room is designed in the same way as main switch room. The low voltage room is air

conditioned, have total 4 sprinkle heads, the door is open outward and located sign

board to prevent unauthorised and create awareness among people.

Apparent Death from Electric Shock Signboard

The apparent death from electric shock signboard was placed in both main switch room and also low voltage switch room. With this signboard, we able to conduct a cardiopulmonary resuscitation (CPR). CPR is a lifesaving technique that useful in emergencies case to someone who stop breathing or the heartbeat has stopped.

CO2 Suppression Systems

Normally, CO2 suppression systems used in unoccupied hazard room such as low voltage switch room. Difference from main switch room, the low voltage room used CO2 suppression systems instead of CO2 fire extinguishers. It can be operated automatically by remotely using electric.


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Equipment hand on wall

The equipment that used in the work of service and repair the low voltage switchboards is different with main switch room. However, the equipment in low voltage room is also required to hand on the wall nicely after use and it is prohibited to take out the room by any authority.

Temperature Sensor

There was only one temperature sensor in low voltage room. It is used to detect the temperature in the low voltage switch room to ensure the room temperature always maintain at 25°C. If the room temperature increase, it will detect by the sensor and the sensor will activate the alarm system at security room.

5.5 Electrical Riser Room


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Electrical riser room is located at every floor of the building which means at PJ Trade

Centre there have total 21 electrical rise room in each tower. The electrical riser room

is where the electrical distribution equipment such as switchgears and panels installed

to distribute the electrical supply to every load point. The electrical conduits feed the

various electrical equipment, switch, and AC units. Most of the electrical supply are

distribute to AC units as it requires a lot of electricity to provide a cool indoor

environment to the offices at every floor at PJ Trade Centre. Each office needed

around 240V of electricity. Riser is a rectangular hollow metal box which used to

protect the transmission cable from the electrical room at basement 7 and goes

vertically up to 21th floor of the building.

5.6 Meter Room


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The diagram shows the meter of Tujuan Gemilang Sdn. Bhd (Menara Bata) in block A

All the floor mounted metering cubicle placed a sticker which written the information

of the organization such as the name of the organization, address, C.T ratio, P.T ratio

and more. This is to allow the authority to know the meter is from which organization

in the building when conducting the electrical bill.

5.7 Battery Room


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Battery Bank

Battery room switchboard

The battery in battery room are used to supply stored to control and operate the substation when no power supply. Self-regulated battery charges are set to the battery to keep the battery in a fully charged level. The battery charger cannot reply upon to supply DC current that operate the protection equipment because it will increase the probability of fault happen and lead to the charger stop to function. This will affect the performance of the battery and cause interruption to local service, significant damage to substation equipment and major system disturbances in serious case. Extra caution should be taken if not having sufficient battery capacity available at all times. Besides, more attention should also be taken to abnormal situation including DC systems. For example, we must always ensure the battery is clean, no cracks, no leaks, dry on top, not lifting and always clean the excessive sedimentation. Besides, maintenance of the battery and chargers is essential to keep the efficiency of


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the battery. Replacement is necessary if the battery capacity is less than 80% of the manufacturer’s nameplate. The replacement of the battery should be made with one year.

5.8 Gun Set Room

Generator in gun set room

The diagram shows the location of Gun Set Room (red colour) on the plan view.


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Battery bank in gen set room

Control panel that shows the amount of electrical power generated by the generator.

This diagram shows the switchboard in gen set room


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.

This diagram shows the pipe that allow the smoke produced by generator transfer

outside the gun set room.


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When there is no power supply to the building, the generator in gun set room is useful to provide power supply in the event of failure of power supply automatically. Different electrical and physical configurations of generators are use depends on different applications. An electrical generator is a device that convey mechanical energy into electrical energy (output). The generator uses the mechanical energy to force the movement of electric charges that present in the wire of its windings through the external electrical circuit. The movement of electrical charges are the main key to produce the output electric current. The electric current supply will transmit through the transmission cable which connect from the generator to the common area and also emergency system such as fire alarm systems and also fire lifts. The common area include lobby, staircase and basement.

The following are the main components of the generator: 1. Engine

2. Alternator

3. Fuel system

4. Voltage regulator

5. Cooling and exhaust systems

6. Lubrication system

7. Battery charger

8. Control Panel

9. Main Assembly


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5.9 UBBL REQUIREMENTS AND REGULATIONS

UBBL By laws - Section 253 – Emergency Power Supply

Section 253 (1)

Emergency power system must be provide when failure of the normal supply or

accident happened to the elements of the system.

Section 253 (2)

Emergency power supply systems must provide power for:

1. Smoke control systems

2. Illumination

3. Fire alarm systems

4. Fire pumps

5. Public address systems

6. Fire lifts

7. Other emergency systems

Section 253 (3)

Emergency systems must have sufficient capacity and rating for all emergency

operation, including simultaneous operation of all fire lift and one other lift.

Section 253 (5)

Current supply must provide to emergency lighting or emergency power or both

within 10 seconds when failure of the normal supply or interruption of normal supply.

Section 253 (5) (a) – Storage Battery

Storage battery with suitable capacity and rating must supply and maintain not less

than 87 ½ % of the system voltage.

Total power supply to emergency lighting and emergency power must last at least 1 ½

hours.

Section 253 (5) (b) – Generator Set

Generator set automatically starting the prime mover on the event of failure of normal

supply.


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6.0 Overall Conclusion

Through this case study report, we have learnt a lot and gain the knowledge of the

mechanical ventilation air conditioning system, fire protection system, mechanical

transportation system and also electrical supply system. It is a great opportunity for us

to conduct a case study on PJ Trade Centre. We have learnt extra knowledge while

having the site visit and more understand about the theories that we learnt from the

lecture classes by applying it to the case study. Overall, it was a memorable

experience to all of us together to complete this case study report.


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Bs 2 group assignment

Education

Transcript of Bs 2 group assignment