Post on 13-Feb-2017
SAFETY PRECAUTIONS WHILE WORKING ON
ELECTRIC INSTALLATIONS
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.
DISASTERS Fire caused by excessive overloading of
current. Short circuit due to improper insulation
of wires. Electric shock by leakage of current.
SAFETY MEASURESEarthing
Types of earthing :1. Pipe Earthing2. Plate Earthing
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 fuse2. Cartridge fuse3. HRC fuse
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. MCB2. MCCB3. ELCB
ELCB, MCB AND MCCB
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.
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.
THANK YOU