This presentation is about precautions to be taken while working on Electric Installations.

1. SAFETY PRECAUTIONS WHILE
WORKING ON ELECTRIC
INSTALLATIONS

2. INTRODUCTION
 When working in the electrical laboratory or
when using electrical equipments, observing
proper safety precautions is equally
important as making accurate
measurements.
 Many deadly hazards exist in the
environment of the electrical laboratory. So
safety measures are required.

3. DISASTERS
 Fire caused by excessive overloading of
current.
 Short circuit due to improper insulation of
wires.
 Electric shock by leakage of current.

4. SAFETY MEASURES
Earthing
 Types of earthing :
1. Pipe Earthing
2. Plate Earthing

5. FUSE
 Fuse is a wire of short length having low
melting point which gives protection against
excessive current.
 Fuse wire melts when heat is produced due to
excessive current and causes the circuit to
break.
 Types:
1. Rewirable fuse
2. Cartridge fuse
3. HRC fuse

6. CIRCUIT BREAKERS
 A circuit breaker is a protective device that is
used for making and breaking of circuit.
 Maximum overload current may be as low as
5000A for a common household circuit breaker
and may be 50000A for industries.
 Types of Circuit Breakers:
1. MCB
2. MCCB
3. ELCB

7. ELCB, MCB AND MCCB

8. OTHER PRECAUTIONS
 Avoid water at all time when working with
electricity.
 Always use insulated tools while working.
 Know the wire code of country.
 Use fuse or circuit breaker with the
appropriate current rating.
 Use insulated wires.

9.  Do not use metal ladder while working at
height with electrical equipments.
 Always take care while soldering your
circuit boards.
 Working outside with underground cables
can be dangerous.

10. THANK YOU