Earth connection is vital to electrical safety. When you disconnecte an fault equiment, you must disconnect the earth pin_________.Isolated equipment is reconnected and work site is made safe in accordance with established safety procedures. The earth pin must be connected___________.
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Fuses or circuit breakers are used to protect circuits/wiring against ______________ and/or ____________
Aresidual current device(RCD) must drip if the residual current more then______mA within ______ms.
I can fix my "fuse frequently blown problem" by fitting a thicker fuse wire or a copper wire.
A. 对
B. 错
If the fuse or circuit breaker keeps brown/trip, one of the fixing is to change a larger capacity fuse or circuit breaker.
A. 对
B. 错