SAFETY DATA SHEET (SOS) - LagunaClay.com Carbide... · SAFETY DATA SHEET (SOS) (
09 Electrical Safety SOS (14!08!2013)
-
Upload
abaidurrehman -
Category
Documents
-
view
214 -
download
0
Transcript of 09 Electrical Safety SOS (14!08!2013)
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
1/40
WELCOME
ELECTRICAL SAFETY AT WORK
Safety theme for September 2013
Compiled by M. Zahid Siddiqui
http://localhost/var/www/apps/conversion/tmp/scratch_5/Phasors.gifhttp://localhost/var/www/apps/conversion/tmp/scratch_5/Phasors.gifhttp://localhost/var/www/apps/conversion/tmp/scratch_5/Phasors.gifhttp://localhost/var/www/apps/conversion/tmp/scratch_5/Phasors.gif -
7/29/2019 09 Electrical Safety SOS (14!08!2013)
2/40
Electrical current is the flow of electrons through a conductor.
A conductor is a material that allows electrons to flow through it.
An insulator resists the flow of electrons.
Resistance opposes electron flow.
Fundamentals of Electricity
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
3/40
Fundamentals of Electricity continued.
ELECTRICAL SAFETY AT WORK
Current Flows in a Loop or Circuit
Circuits are AC (alternatingcurrent) or DC (direct current).
Current is usually AC.
AC current has five parts:
(1) Electrical source
(2) HOT wire to the tool.
(3) The tool itself
(4) NEUTRAL wire returnselectricity from the tool
(5) GROUND
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
4/40
Fundamentals of Electricity continued.
ELECTRICAL SAFETY AT WORK
How Shocks Occur
Current travels in closed circuits through
conductors (water, metal, the human
body).
Shock occurs when the body becomes apart of the circuit.
Current enters at one point & leaves at
another.
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
5/40
ELECTRICAL SAFETY AT WORK
Shocks Occur in Three Ways
Contact with both
conductors
Contact with oneconductor and ground
With a tool: contact with
hot metal part and
ground (1), (2) & (3)
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
6/40
Take Electricity Seriously
Electricity is the second leading cause of death in construction.
Electrocutions make up 12% of construction fatalities annually.
Over 30,000 non-fatal shocks occur each year.
Over 600 deaths occur annually due to electrocution.
It doesn't take a lot of electricity to kill you. The amount of current
needed to light an ordinary 60-watt light bulb is five times what can kill a
person. Thus, all electrical equipment on construction sites is potentially
deadly.
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
7/40
Take Electricity Seriously continued.
ELECTRICAL SAFETY AT WORK
Severity of the Shock depends on:
Amount of current
Determined by voltage and resistance toflow
Path through the body
Duration of flow through the body
Other factors such as general health and
individual differences. LOW VOLTAGE DOES NOT MEAN
LOW HAZARD!
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
8/40
Leading Causes of Electrical Accidents
Drilling and cutting through cables
Using defective tools, cables and equipment
Failure to maintain clearance distance of 10 feet
Failure to de-energize circuits and follow Lock out/Tag out procedures
Failure to guard live parts from accidental worker contact
Unqualified employees working with electricity
Improper installation/use of temporary electrical systems and equipment
By-passing electrical protective devices
Not using GFCI (ground fault circuit interrupters) devices
Missing ground prongs on extension cords
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
9/40
Leading Causes of Electrical Accidents
ELECTRICAL SAFETY AT WORK
Use of Flexible Cords
Are more vulnerable than fixed wiring.
Should not be used if recognized wiring
methods can be used instead.
Flexible cords can be damaged by: Aging
Door or window edges
Staples or fastenings
Abrasion from adjacent materials
Activities in the area Improper use of flexible cords can cause
shocks, burns or fire.
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
10/40
Leading Causes of Electrical Accidents
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
11/40
Leading Causes of Electrical Accidents
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
12/40
Meaning of Hazard
Hazard means:
any potential or actual threat to the wellbeing of people, machinery or
environment
Electrical hazard safety means:
taking precautions to identify and control electrical hazards
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
13/40
Electrical Hazard Awareness
It is essential to know about it Because failing to take the necessary
precautions can lead to:
injury or death
fire or property damage
Electrical hazards exist in almost every workplace. Common causes
of electrocution are:
making contact with overhead wires
undertaking maintenance on live equipment
working with damaged electrical equipment, such as extension
leads, plugs and sockets
using equipment affected by rain or water ingress
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
14/40
ELECTRICAL SAFETY AT WORK
Electrical Hazard Awareness
Difference between incident and emergency:
An incident is something that has already happened that may need
attending too quickly, whereas an emergency is something that will need tohave attention because it may make the situation less harmful
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
15/40
How do you respond to electrical incidents?
What should you do in an electrical emergency?
For low voltage electricity >50 V AC and 110 V DC
remove the source of electricity supply
commence CPR if trained call the emergency number on site
For high voltage electricity >1000 V
call the emergency number for your site
dont go near the casualty
dont touch the casualty or try to free them with anything
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
16/40
Your respond to electrical incident
If you come across a person receiving an electric shock:
if possible, disconnect the electrical supply (switch?)
assess the situation never put yourself at risk
take precautions to protect yourself and anyone else in the vicinity
apply the first aid principles (e.g. DRSABCD)
assess the injuries and move the casualty to
a safe area if required
administer first aid if trained
seek urgent medical attention
ELECTRICAL SAFETY AT WORK
Electrical Hazard Awareness
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
17/40
How do you respond to electrical incidents?
You could be the victim if you:
Dont follow proper procedures aroundelectricity
Use electrical equipment improperly
Use faulty electrical equipment
Following are the types of injuries due to
electric shock:
Falls
Electric shock; Electric burn;
Fires of electrical origin;
Electric arcing;
Explosions initiated or
caused by electricity.
ELECTRICAL SAFETY AT WORK
Electrical Hazard Awareness
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
18/40
Effects of Current Flow
Levels of effect of current on human body
More than 3 milliamps (mA): painful shock
More than 10 mA: muscle contraction More than 20 mA: considered severe shock
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
19/40
Effectsof Current Flow
How do you respond to electrical incidents?
Levels of effect of current on human body continued
More than 30 mA: lung paralysis - usually temporary
More than 50 mA: possible ventricular fibrillation (usuallyfatal)
100 mA to 4 amps: certain ventricular fibrillation (fatal)
Over 4 amps: heart paralysis; severe burns
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
20/40
Effects of Current Flow continued.
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
21/40
Effects of Current Flow continued.
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
22/40
Effects of Current Flow continued.
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
23/40
How do you respond to electrical incidents?
All electrical incidents must be reported
Electricity is invisible this in itself makes it
dangerous
It has great potential to seriously injure or kill
The company has a duty of care to its employees
and contractors
Everyone is exposed to electrical hazards, not just
electricians
Report all electrical shocks and near misses
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
24/40
How do you respond to electrical incidents?
Protect yourself and your colleagues from electricity
Dont wear metal objects
Turn power off
Wear appropriate clothing Dont touch live parts
Dont install or repair
electrical equipment
Use qualified personnel
Clean and dry leads and
plugs before use
Use PPE
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
25/40
How do you respond to electrical incidents?
Some more safety measures
Heed warning signs
Use the right equipment
Study the operation manual
Take care of extension leads
Use only approved extension lamps
Dont pull on leads
Use residual current devices RCDs
Use the proper fuses and circuit breakers
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
26/40
How do you respond to electrical incidents?
Regular safety inspections
are a part of YOUR job...
Electrical equipment should be
checked each time before use fordefects
If not tagged or the tag is out of date
then report it and place it out of service
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
27/40
How do you respond to electrical incidents?
ELECTRICAL SAFETY AT WORK
Controlling Electrical Hazards
Employers must follow the OSHA Electrical Standards (Subpart
K)
Electrical installation
Subpart K includes four proactive methods:
Electrical Isolation
Equipment Grounding
Circuit Interruption
Safe Work Practices
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
28/40
Power line to be approached safely
How do you respond to electrical incidents?
Up to and including to 33 kV
2.3 m when passing underneath and 3 m when
passing to the side
Above 33 kV
4 m when passing underneath and 6 m when
passing to the side
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
29/40
How do you respond to electrical incidents?
ELECTRICAL SAFETY AT WORK
Controlling Electrical HazardsCircuit Protective Devices
Circuit Breakers and Fuses
Only protect the building, equipment, and tools from heat build-
up!Never depend on circuit breakers or fuses to prevent shocks!
Ground Fault Circuit Interrupter (GFCI)
It is one of the device which will protect the worker from shockand electrocution!
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
30/40
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
31/40
How do you respond to electrical incidents?
ELECTRICAL SAFETY AT WORK
Circuit Protective DevicesResidual Current Device (RCD):
An RCD is a safety device that
disconnects a circuit when it detects animbalance of the electric current. Itworks on the principle that the electricityflowing into a circuit must be equal tothe current flowing out of a circuit. Whena person receives a shock, it means
some current is diverted through thebody directly to earth.
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
32/40
How do you respond to electrical incidents?
ELECTRICAL SAFETY AT WORK
Circuit Protective DevicesResidual Current Device (RCD) continued..
If the RCD detects an imbalance in the electrical current, indicating aleakage to earth, it immediately cuts the electricity supply to preventelectrocution.
An RCD cannot detect all types of faults, for example if a person receivesa shock between the active and neutral conductors. However, thesecircumstances are rare and the vast majority of incidents occur betweenthe active conductor and earth, which is protected by an RCD.
If a person comes in contact with a live electrical conductor, electricityflows through their body, causing an electric shock. Effects can vary froma tingling sensation or muscular pain to breathing difficulties, burns andheart failure.
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
33/40
How do you respond to electrical incidents?
ELECTRICAL SAFETY AT WORK
Circuit Protective Devices
Residual Current Device (RCD): continued..
RCDs are extremely sensitive, disconnecting within 10 to 50milliseconds of detecting a leakage current. This is usually 30
milliamps for domestic residences but may be lower in other locationssuch as hospitals. This stops the flow of electricity through someonesbody to earth. Importantly, this response time is much faster than thecritical section of the cardiac cycle and therefore significantly reducesthe risk of death or serious injury.
RCDs also protect against fire caused by faults in appliances, toolsand wiring. If these faults go undetected they could cause a fire orpersonal injury. RCDs provide a means of early fault detection.
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
34/40
How do you respond to electrical incidents?
ELECTRICAL SAFETY AT WORK
Circuit Protective Devices
Residual Current Device (RCD): continued.
RCDs are required to be fitted at the meter box (main switchboard) ordistribution board for the residence.
Various brands of RCDs are available; however they can all beidentified by the test button located on the front of the device.
If you press the test button, or the RCD has detected an imbalance,
the on/off switch will jump to the off position.
Residual-current device is a generic term covering both RCCBs andRCBOs
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
35/40
How do you respond to electrical incidents?
ELECTRICAL SAFETY AT WORK
Circuit Protective Devices
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
36/40
Power Line Corridor
How do you respond to electrical incidents?
MSI Regulation 5.28 defines a power line corridor as the area under
any overhead power line that has not been properly isolated, and 10
metres either side of the power line.
It is essential that these areas are respected. They are there for
the safety of everyone
Do not store equipment, machinery, buildings or structures in
power line corridors
Do not construct, fabricate or maintain structures, buildings,
machinery or equipment in power line corridors
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
37/40
First obtain permission to dig
How do you respond to electrical incidents?
Be aware of the potential hazard from buried electrical cables for the
following activities:
excavation
drilling
trenching
levelling
digging
driving of stakes or pegs
Do not commence excavation work near buried cables unless a
permit has been issued by an authorised person
Do you know what precautionary measures need to be taken?
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
38/40
The key messages are
The risk of electric shock from correctly installed and
maintained power sources is negligible, provided that sensible
precautions are taken by the operator and correct work
procedures are followed
Ensure that the right person is carrying out electrical work
licensed versus competent
Electricity is essential but, improperly used, it can be DEADLY!
ELECTRICAL SAFETY AT WORK
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
39/40
ELECTRICAL SAFETY AT WORK
References 29 CFR 1926.400; Subpart K
National Electric Code (NEC)
AD EHSMS RF Version 2.0 February 2012
CoP 15.0 Electrical Safety
-
7/29/2019 09 Electrical Safety SOS (14!08!2013)
40/40
End of the presentation
ELECTRICAL SAFETY AT WORK