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在几个社会制度中发生作用的经济规律是( )。
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Isolated equipment is reconnected and work site is made safe in accordance with established safety procedures. You must check the resistance between the equipment metal casing and a known earth is not grater then_______Ω. (Australian Standard)
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___________.
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.
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