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Do-It-Yourself (DIY) Question & Answer Forum
advice on reason of tripping rcd
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<blockquote data-quote="Rack Failure" data-source="post: 76789" data-attributes="member: 5665"><p>It is likely that a neutral and earth cable were touching when they were taped. The reason RCD would trip even although lights MCB was off is because all circuit neutrals are connected together at the neutral bar in CU. Therefore any neutral shorting to earth effectively shorts all circuit neutrals to earth.</p><p></p><p>The time delay in RCD tripping would be dependant on the load being drawn from the CU. Would require 30mA imballance to trip RCD.</p><p></p><p>Charge either min 1 hour or whatever you charge for a call out.</p></blockquote><p></p>
[QUOTE="Rack Failure, post: 76789, member: 5665"] It is likely that a neutral and earth cable were touching when they were taped. The reason RCD would trip even although lights MCB was off is because all circuit neutrals are connected together at the neutral bar in CU. Therefore any neutral shorting to earth effectively shorts all circuit neutrals to earth. The time delay in RCD tripping would be dependant on the load being drawn from the CU. Would require 30mA imballance to trip RCD. Charge either min 1 hour or whatever you charge for a call out. [/QUOTE]
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advice on reason of tripping rcd
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