Main Switchboard Safety Devices

Overload trip

Preferential trip

Under voltage trip

Over voltage trip

Reverse power relay (No voltage trip)

Reverse current trip

Fuse

A .C .B( Air circuit breaker )

Earth lamps.

Low frequency trip

Meters

Synchroscope

Emergency synchronizing lamp

Ebonite handrail and Rubber footstep

Precaution on Switch board

An insulation rubber or plastic mat is placed in front of the S.B

All metal parts of the S.B are connected to the earth

The operator is to put on the electrician hand gloves to operate the switches

Meters fitted on main switchboard ?

Ammeter, Voltmeter, Wattmeter, Frequency meter, Ohm meter, Synchroscope.

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