In this course, we will discuss the following:
Common electrical hazards
Standards relating to those hazards
Electrical equipment defects/hazards
Tools/techniques used in identifying hazards
ELCB and MCB.
3. Common Electrical Hazards
Electric shock/electrocution occurs when current
flows through the body damaging the body.
Electrical burns are caused by arc blast or hot
Indirect falls from ladders, scaffolds, or other
walking and working surfaces.
4. Explosions can be caused when electricity
provides a source of ignition for an explosive
mixture in the atmosphere.
Fires are caused by overloading a circuit or
appliance or by current flowing through
high resistance due to faulty
wiring, setting fire to insulation
and surrounding materials.
Common Electrical Hazards
5. Listed, labeled, or
must be installed and
used in accordance
included in the listing,
6. General Requirements
Splicing devices suitable for
Covered with insulation
equivalent to that of the
Insulating device suitable for
7. General Requirements
Each service, feeder,
and branch circuit, at
means or over
current device, shall
be legibly marked to
indicate its purpose.
8. General Requirements
Live parts of electric equipment operating at 50
volts or more shall be guarded against
accidental contact by cabinets or other forms of
enclosures, or by another suitable method.
9. Wiring Design and Protection
The frame of the generator is bonded to
the vehicle frame, and
Generator supplies only
equipment located on the
vehicle and/or equipment
plugged into the generator,
10. Wiring Design and Protection
Equipment connected by cord and plug must be
In a hazardous location
Operated at over 150 V to
» Except guarded motors and
appliances permanently insulated
Hand held motor-operated tools
Equipment used in wet and/or
Portable hand lamps
11. Wiring Design and Protection
Flexible cords and cables must be protected
12. Wiring Design and Protection
Conductors entering boxes, cabinets, or
fittings must be protected from abrasion.
13. Wiring Design and Protection
Unused openings in cabinets, boxes and
fittings must be effectively closed.
14. Wiring Design and Protection
All pull boxes, junction
boxes, and fittings must
be provided with a cover.
If metal covers are used,
they must be grounded.
15. Wiring Design and Protection
Permitted uses of flexible cords and cables
Portable lamps and
Elevators cables, cranes,
Stationary equipment –
Appliances – to permit removal
for maintenance and repair
16. Wiring Design and Protection
Prohibited uses of flexible cords
As substitute for fixed wiring of
Run through holes in walls, ceilings
Run through doors, windows or
Attached to building surfaces
Concealed behind building walls,
ceilings, or floors
17. Safety-Related Work Practices
Employer must not permit an employee to
work in such proximity to any part of an
electric power circuit.
If employee could
contact the power
circuit, it must be
18. Tools for Identifying Hazards
An electrical receptacle
voltage tester with GFCI
Line voltage probes
is used for the protection against electrical
leakage in the circuit. When somebody
gets an electric shock or the residual
current of the circuit exceeds the fixed
value, ELCB cuts off the power within the
time of 0.1s automatically protecting the
personal safety and preventing the
equipment from the fault. ELCB also
protect the circuit against over load and
21. Mini Circuit Breaker
It is used for protecting the circuit against
overload and short circuit. It can be used
in lighting and electric motor distribution
22. Moulded Case Circuit Breaker
It is used to control electric energy in
distribution network and is having
overload and short circuit protection
23. Direct On Line Starter
DOL magnetic starter is mainly used for controlling
motors up to 7.5 HP .It also has an OVER LOAD RELAY
for protecting the motor against overloading.
24. Presented by:- ME 2A.
1. CHAUHAN DHRUV (130810119014)
2. DIXIT MIHIR (130810119021)
3. MANAN KASABWALA (130810119040)
- VENUS INTERNATIONAL COLLEGE OF TECH.