SECTION 26 05 33.13-ELECTRICAL BOXES AND FITTINGS.pdf

MINISTRY OF HOUSING Western Sector Projects Sitework & Infrastructure OMRANIA and ASSOCIATES Project Specification

ELECTRICAL BOXES AND FITTINGS SECTION 26 05 33.13 - 1

SECTION 26 05 33.13

ELECTRICAL BOXES AND FITTINGS

PART 1: GENERAL 1.01 SECTION INCLUDES

All types and sizes of electrical boxes and fittings including, but not limited to the following:

1. Outlet boxes.

2. Weatherproof outlet boxes.

3. Junction/pull boxes.

4. Cabinets/enclosures.

5. Floor boxes.

6. Conduit bodies.

7. Fittings.

1.02 RELATED SECTIONS

A Section 0133 00 Submittals Procedures.

B Section 01 61 00 Common Product Requirements.

C Section 01 78 36 Warranties

D Section 26 05 00 Common Work Results for Electrical.

E Section 26 05 53 Electrical Identification.

F Section 26 05 33 Electrical Raceways.

G Section 26 05 29 Equipment Connections and Supports.

H Section 26 27 26 Wiring Devices.

I Section 26 29 00 LV Controllers.

J Section 33 71 73.13 Electric Meters.

K Section 26 24 16 Panel Boards.

1.03 REFERENCES

A SASO Saudi Arabian Standards Organization.

B IEC 60364 Electrical Installations of Buildings.

C IEC 60529 Degrees of Protection provided by Enclosures (IP Code).

D BSEN 10346 Continuously Hot-Dip Zinc Coated Steel Flat Products.

E BSEN 12844 Zinc and Zinc Alloys for Castings - Specifications.



F BS 7671 Requirements for Electrical Installations (IEE Wiring Regulations).

G NFPA 70 National Electrical Code (NEC).

H SEC DPS SEC Distribution Planning Standards.

I SEC SDMS SEC Distribution Materials Specifications.

J SEC SDCS SEC Distribution Construction Standards.

1.04 SUBMITTALS

A Comply with section 01 33 00.

B Submit manufacturer's catalogues and technical data including dimensions of all electrical boxes and fittings.

C Submit samples of each type of proposed boxes and fittings.

1.05 QUALITY ASSURANCE

A Manufacturers: Firms regularly engaged in manufacture of electrical boxes and fittings of all types and sizes required, whose products have been in satisfactory use in similar service for not less than 5 years. Preference shall be given to local manufacturers and agents/suppliers.

B Installer: Firms regularly engaged and qualified with at least 5 years of successful installation experience on projects with electrical installation work similar to that required for this project.

1.06 DELIVERY, STORAGE AND HANDLING


B Store electrical boxes and fittings indoors with appropriate protection against corrosion and damage.

1.07 WARRANTY


1.08 SEC/MUNICIPALITY COMPLIANCE

A Contractor shall comply with all applicable SEC distribution material specification, construction and planning standards for power distribution networks and municipality specification for road lighting. Some of the specifications and standards are attached with the contract documents for guidance, however contractor shall obtain copy of all applicable specification and standards from the concerned authorities as required on site or instructed by the Engineer.

B Any conflict found between this project specification and SEC or municipality specification/standards shall be immediately brought to the notice of Engineer for final decision.

PART 2: PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS



Not Used.

2.02 OUTLET BOXES

A Provide galvanized flat, rolled sheet steel interior outlet wiring boxes of types, shapes, sizes and depths to suit each respective location and installation. Construct threaded screw holes with corrosion-resistant screws for securing box covers and wiring devices.

B Provide a terminal with screw inside the box for grounding connection of all metallic outlet boxes with appropriate earth mark.

C Accessories for outlet boxes such as mounting brackets, wallboard hangers, extension rings, fixture studs, grounding connection, cable clamps, metal straps for supporting outlet boxes, etc. shall be compatible with outlet boxes being used and fulfilling requirements of individual wiring situations.

D Exposed or surface mounted boxes, when used with rigid steel conduits, shall have threaded hubs. These boxes shall be cast from ferro-alloy or malleable iron, hot-dip galvanized.

E Ceiling boxes shall be 75 mm circular or square, and 50 mm deep complete with fittings where required to support fixtures.

F Provide gang boxes at locations where more than one device is to be mounted.

G Provide combination boxes with barriers for wiring of more than one system.

H Provide panel mounted fixing frames where outlet boxes are installed in paneling.

I Outlet box shall be of adjustable grid type.

J All circular PVC boxes where used to support light fittings shall be provided with steel insert clips.

2.03 WEATHERPROOF OUTLET BOXES

A Provide weatherproof outlet boxes for interior and exterior locations exposed to weather or moisture or where shown on the drawings.

B Provide corrosion-resistant cast metal weatherproof outlet wiring boxes of types, shapes, sizes and depths to suit each location and installation as shown on the drawings.

C Weatherproof outlet boxes shall be provided with threaded conduit ends, terminal with screw for ground connection, cast metal face plates with spring-hinged waterproof caps, suitably configured for each application, including face plate gaskets and corrosion resistant fasteners.

D All weatherproof outlet boxes shall be provided with corrosion free epoxy powder coat, to provide corrosion resistance with appropriate gasket.

E For outdoor applications and areas with corrosive atmosphere, boxes for use with PVC coated steel conduits shall be galvanized cast boxes with a PVC factory applied coating of 40 mm minimum thickness. Boxes shall have hubs with extruded sleeves extending the hubs.

F The outlet boxes in hazardous (classified) locations and special occupancies shall conform to NEC, Chapter 5, articles 500 through 517.

2.04 JUNCTION/PULL BOXES



A Provide hot-dip galvanized, zinc coated, code gauge sheet steel junction and pull boxes with screws on cover, of types, shapes, sizes and depths to suit each respective location and installation. Minimum depth shall be 50 mm.

B Junction/pull boxes shall be provided with welded seams and appropriate cast covers, equipped with stainless steel nuts, bolts, screws, washers and terminal with screw for ground connection.

C All junctions on lighting, power, signaling, communications, alarms and control wiring shall be provided with terminal strips. Terminal strips shall have screw type terminals and cable identification strip.

D Sufficient draw-in/pull boxes shall be provided to permit easy wire pulling during installation as well as for maintenance.

E Not more than two right-angled bends or 10 meter length of conduit shall be permitted between draw boxes. Vertical conduit runs more than 3 meter shall provide cable support using a draw-in box.

2.05 CABINETS/ENCLOSURES

A Provide cabinets/enclosures with welded seams and appropriate cast covers, equipped with stainless steel nuts, bolts, screws, washers and terminal with screw for ground connection.

B Cabinets/enclosures shall be provided with hinged covers, where required.

C Cabinets/enclosures shall be provided with reinforced steel back plates for mounting interior components, and to ensure rigidity and accurate alignment.

2.06 FLOOR OUTLET BOXES

A Provide corrosion resistant, hot-dip galvanized, zinc coated sheet steel floor outlet boxes of the types, shapes, sizes and depths to suit each respective location and installation. The floor outlet boxes shall be suitable for raised floor trunking or under floor ducting system as required.

B Depths of floor outlet boxes shall be sufficient to accommodate conduit entries from sides and all kinds of wiring devices with plugs from the top.

C Cover of floor outlet boxes shall be capable of closing completely after installation of plugs and connecting devices inside the box. The cover shall be suitable for flush floor installation with provision of fixing carpet, vinyl sheet, etc. above the cover to match with the finish of the floor.

D Floor outlet boxes shall be waterproof when fully closed. Appropriate rubber grommet for cable protection shall be available for cable outlets from the floor base. The grommets shall have an automatic lock function that prevents the cables from getting cut should traffic pass over the box. The trap shall be fully reversible to allow for change of direction of cable exit without the need to remove the trap frame.

E The floor outlet boxes shall have a fully flexible plate configuration within them to ensure that difficult configurations are achieved with ease.

F Service outlet boxes for raised floor trunking system shall comprise an electro-galvanized steel base frame to be installed in the raised floor tile. A die cast zinc alloy service outlet frame and trap shall be mounted in the base frame. The base unit, service outlet frame and traps shall have an oven baked epoxy powder paint finish for protection against rust and corrosion. Provide flexible conduit of minimum 3 meter length to connect the service outlet box to the raised floor trunking.



G Provide service outlet boxes and junction boxes for under floor ducting system, constructed from high pressure zinc alloy die casting base frame and fixed to heavy gauge hot-dip galvanized steel base plate adequate in strength and performance. These boxes shall comply with the following requirements:

1. The design of the base frame shall cast the whole unit in one piece without any joints/fabrication to prevent corrosion and concrete slippage into the box during casting of concrete or screeding. The boxes shall be constructed with provisions for ducting or conduit access on all four sides. Unwanted entries shall be blanked off with detachable side blanks. All exposed portion of the boxes shall be epoxy coated.

2. Cover for service outlet boxes shall be made of high pressure zinc alloy die casting provided with suitable hinges designed to enable the trap cover to open through 180 degrees and giving access at all times to the power, data, telephone and other outlets.

3. Covers for service and junction boxes shall be made of high pressure zinc alloy die casting secured by counter sunk screws. The covers shall be provided with recess to accept the same floor finish.

4. All boxes shall be adjustable in height, independent of the ducting system to take account of difference in floor / screed thickness.

5. Adequate segregation shall be provided between service runs within junction boxes by using cross-over bridges and rigid compartments.

6. Cables emerging from service outlet boxes shall be protected against damage by means of nylon cable-exit grommets or equivalent and approved material and shall be reversible to close position when not in use. The lifting handle and cable grommets shall be provided in opposite sides of the trap cover to allow easy access to lifting handle and to avoid damage of the cable insulation.

H All floor outlet boxes shall be complete with waterproof gasket and circuit protective conductors between the covers and the boxes.

I Provide combination of slab boxes under raised floor and PVC grommets flushed with raised floor tile when required and shown on the drawings for raised floor trunking system. The slab box shall be constructed from hot-dip galvanized sheet steel suitably sized to accommodate all power, data, telephone and other outlets fixed on top cover plate or on the sides as required and approved by the Engineer. The grommets with lid shall be suitable for the raised floor tile and have opening sufficient to allow passage of all the cables and plugs through it.

2.07 CONDUIT BODIES

A Provide galvanized conduit bodies of types, shapes and sizes such as capped elbows and service entrance elbows to suit respective locations and installation, with corrosion-resistant screws for fixing.

B Conduit bodies and covers shall be constructed from the same material and shall have the same finish or protective coating as that of associated conduits.

C Conduit bodies shall be appropriately threaded for conduits and equipped with corrosion resistant screws for fixing inspection covers.

D Weatherproof conduit bodies and covers shall be provided with corrosion-free epoxy powder coat, to provide resistance again corrosion. Covers shall be gasketed.



2.08 FITTINGS

A Provide corrosion-resistant fittings for electrical boxes such as punched-steel box knockout closures, conduit locknuts, malleable iron conduit bushings, offset connectors, covers of types and sizes to suit respective uses and installation.

B Covers of junction/pull boxes, cabinets/enclosures, etc. shall be of the same thickness and material as that of the box and shall be reinforced where required due to size. Screws for covers shall be stainless steel or high quality brass.

PART 3: EXECUTION 3.01 PREPARATION

A Determine exact locations of outlets on site after co-ordination with architectural, furniture and equipment layouts.

B Locations of junction/pull boxes and other fittings and accessories are generally not shown on the drawings, but contractor shall provide these in compliance with applicable requirements, ease of maintenance, manufacturers written instructions and recognized industry practices.

3.02 GENERAL

A Coordinate installation of electrical boxes, fittings and cabinets/enclosures with wire/cable and raceway installation work.

B Provide knockout closures in all types of electrical boxes and cabinets/enclosures to cap unused knockout holes where blanks have been removed.

C Install all types of boxes and conduit bodies at accessible locations to ensure easy installation and maintenance of electrical wiring.

D Provide electrical and earth connections for all types of electrical boxes and cabinets/ enclosures.

E Fastenings for all types of exposed/surface mounted electrical boxes shall not penetrate more than 30 mm into reinforced concrete beams or more than 20 mm into reinforced concrete joists and shall not contact main reinforcing steel.

F All types of outlet boxes and conduit bodies shall be supported at 150 mm (approx) from each side.

3.03 OUTLET BOXES INSTALLATION

A Provide interior or weatherproof outlet boxes for each light fixture, receptacle, equipment connection and other conduit termination points.

B Avoid using round boxes where conduit must enter through side of box, which would result in difficult and insecure connections when fastened with locknut or bushing on rounded surface.

C Fasten boxes rigidly to substrate or structural surfaces, or solidly embed electrical boxes in concrete or masonry.

D Boxes and supports shall be fastened with toggle bolts on hollow masonry units and with machine screws or welded studs on steel work.



E In open overhead spaces, cast metal boxes threaded to raceways need not be separately supported except where used for fixture support. Support cast metal boxes having thread-less connectors and sheet metal boxes directly from the building structure or with bar hangers.

F Where conduit supported outlet boxes are installed and conduit is suspended from the structure with hangers, attach hangers to raceways on opposite sides of the box and support with approved fasteners not more than 1 m measured each side from the box.

G In suspended ceilings where outlet boxes support fixtures in which the ceiling suspension system does not have sufficient strength to prevent visible deflection of the ceiling surfaces, boxes shall be supported by structural members, secured to the building structure.

H Covers of outlet boxes shall not be used to support fixtures.

I Locate boxes in hung ceiling spaces so that they do not interfere with the removal of ceiling tiles or equipment.

J Where outlet boxes are installed flush in exposed concrete blocks in finished areas, blocks shall be cut by using appropriate tools as approved by the Engineer. Ensure that openings are cut to fit boxes so that edges of openings are not visible after installation of cover plates. The use of mortar to patch oversize or ragged openings will not be permitted.

K Do not mount boxes between the same pair of studs, on opposite sides of sound-rated partitions. Seal spaces between boxes and gypsum board with acoustical sealant.

L Outlet boxes shall be secured by sheardized class 1 or stainless steel screws of a minimum size of 30 mm x No.8 or equal.

3.04 JUNCTION/PULL BOXES INSTALLATION

A Requirement for pull boxes shall be determined based on maximum allowable conduit runs to facilitate the pulling-in of cables/wires, as described in section 26 05 33 (Electrical Raceways).

B Where pull boxes (existing and new) are connected to conduits running underground in the site, they shall be provided with suitable provision for draining.

C Locate junction and pull boxes so as to be accessible at all times. Boxes may be installed in mechanical, electrical, storage or janitor rooms or in hung ceiling space.

D Provide access hatches for junction/pull boxes installed in ceiling spaces unless ceiling tiles are of lay-in or snap-in type.

E Locate junction and pull boxes so that piping, ductwork or equipment will not restrict or block access.

F Cables connected to terminals or passing through boxes shall be identified on the strip and by cable markers.

G Terminal strips may be omitted where there are less than 3 connections in a junction box, but all conductors shall be identified by cable markers.

H Terminals may be omitted for through cables which are not broken at a junction box.

3.05 FLOOR OUTLET BOXES INSTALLATION



A Mark the locations of all service outlet boxes and junction boxes on the floor slab as per approved shop drawings, and review all practical aspects before start of installation.

B Cover junction boxes and service outlet boxes in under floor ducting system with the disposable screeding lids, approximately leveled and tapped to ensure no cement/mortar gets into the boxes during screeding.

C Adjust floor outlet boxes so that closure plates are flush with the surface of the floor tile, or the floor if carpeting is specified. Provide under floor duct fittings and outlets or single flush outlets with waterproof covers, as indicated on the drawings.

END OF SECTION

SECTION 26 05 33.13

SECTION 26 05 33.13-ELECTRICAL BOXES AND FITTINGS.pdf

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