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.
