Basic Electrical Safety in
Construction.
PRESENTED BY :- ME 2A.
Objectives
In this course, we will discuss the following:
 Common electrical hazards
 Standards relating to those hazard...
Common Electrical Hazards
 Electric shock/electrocution occurs when current
flows through the body damaging the body.
 E...
 Explosions can be caused when electricity
provides a source of ignition for an explosive
mixture in the atmosphere.
 Fi...
 Listed, labeled, or
certified equipment
must be installed and
used in accordance
with instructions
included in the listi...
General Requirements
 Splices
 Splicing devices suitable for
use
 Welding/brazing/soldering
 Mechanically/electrically...
General Requirements
 Each service, feeder,
and branch circuit, at
its disconnecting
means or over
current device, shall
...
General Requirements
 Live parts of electric equipment operating at 50
volts or more shall be guarded against
accidental ...
Wiring Design and Protection
 Vehicle-mounted generators
 The frame of the generator is bonded to
the vehicle frame, and...
Wiring Design and Protection
 Equipment connected by cord and plug must be
grounded, if:
 In a hazardous location
 Oper...
Wiring Design and Protection
 Flexible cords and cables must be protected
from damage.
Wiring Design and Protection
 Conductors entering boxes, cabinets, or
fittings must be protected from abrasion.
Wiring Design and Protection
 Unused openings in cabinets, boxes and
fittings must be effectively closed.
Wiring Design and Protection
 All pull boxes, junction
boxes, and fittings must
be provided with a cover.
 If metal cove...
Wiring Design and Protection
 Permitted uses of flexible cords and cables
 Pendants
 Fixture wiring
 Portable lamps an...
Wiring Design and Protection
 Prohibited uses of flexible cords
and cables
 As substitute for fixed wiring of
structure
...
Safety-Related Work Practices
 Employer must not permit an employee to
work in such proximity to any part of an
electric ...
Tools for Identifying Hazards
 An electrical receptacle
voltage tester with GFCI
tester.
 Line voltage probes
Earth Leakage Circuit Breakers
ELCB
is used for the protection against electrical
leakage in the circuit. When somebody
gets an electric shock or the res...
Mini Circuit Breaker
It is used for protecting the circuit against
overload and short circuit. It can be used
in lighting ...
Moulded Case Circuit Breaker
It is used to control electric energy in
distribution network and is having
overload and shor...
Direct On Line Starter
DOL magnetic starter is mainly used for controlling
motors up to 7.5 HP .It also has an OVER LOAD R...
Presented by:- ME 2A.
1. CHAUHAN DHRUV (130810119014)
2. DIXIT MIHIR (130810119021)
3. MANAN KASABWALA (130810119040)
- VE...
Upcoming SlideShare
Loading in …5
×

Basic electrical safety.. or safety and protection.

1,625 views

Published on

basic electrical safety along with mcb, elcb , etc.
its useful for EEE subject. and ppt of it..

Published in: Engineering, Business
0 Comments
6 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
1,625
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
201
Comments
0
Likes
6
Embeds 0
No embeds

No notes for slide

Basic electrical safety.. or safety and protection.

  1. 1. Basic Electrical Safety in Construction. PRESENTED BY :- ME 2A.
  2. 2. Objectives 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. 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 conductors.  Indirect falls from ladders, scaffolds, or other walking and working surfaces.
  4. 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. 5.  Listed, labeled, or certified equipment must be installed and used in accordance with instructions included in the listing, labeling or certification. General Requirements
  6. 6. General Requirements  Splices  Splicing devices suitable for use  Welding/brazing/soldering  Mechanically/electrically secure before soldering  Covered with insulation equivalent to that of the conductors  Insulating device suitable for purpose
  7. 7. General Requirements  Each service, feeder, and branch circuit, at its disconnecting means or over current device, shall be legibly marked to indicate its purpose.
  8. 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. 9. Wiring Design and Protection  Vehicle-mounted generators  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, and…
  10. 10. Wiring Design and Protection  Equipment connected by cord and plug must be grounded, if:  In a hazardous location  Operated at over 150 V to ground » Except guarded motors and appliances permanently insulated from ground  Hand held motor-operated tools  Equipment used in wet and/or conductive locations  Portable hand lamps
  11. 11. Wiring Design and Protection  Flexible cords and cables must be protected from damage.
  12. 12. Wiring Design and Protection  Conductors entering boxes, cabinets, or fittings must be protected from abrasion.
  13. 13. Wiring Design and Protection  Unused openings in cabinets, boxes and fittings must be effectively closed.
  14. 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. 15. Wiring Design and Protection  Permitted uses of flexible cords and cables  Pendants  Fixture wiring  Portable lamps and appliances  Elevators cables, cranes, and hoists  Stationary equipment –  Frequent interchange  Appliances – to permit removal for maintenance and repair
  16. 16. Wiring Design and Protection  Prohibited uses of flexible cords and cables  As substitute for fixed wiring of structure  Run through holes in walls, ceilings or floors  Run through doors, windows or similar openings  Attached to building surfaces  Concealed behind building walls, ceilings, or floors
  17. 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 de-energized or guarded.
  18. 18. Tools for Identifying Hazards  An electrical receptacle voltage tester with GFCI tester.  Line voltage probes
  19. 19. Earth Leakage Circuit Breakers
  20. 20. ELCB 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 short-circuit.
  21. 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 system.
  22. 22. Moulded Case Circuit Breaker It is used to control electric energy in distribution network and is having overload and short circuit protection
  23. 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. 24. Presented by:- ME 2A. 1. CHAUHAN DHRUV (130810119014) 2. DIXIT MIHIR (130810119021) 3. MANAN KASABWALA (130810119040) - VENUS INTERNATIONAL COLLEGE OF TECH.

×