rcd tripping on a ring main | Page 2 | on ElectriciansForums

Discuss rcd tripping on a ring main in the UK Electrical Forum area at ElectriciansForums.net

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Ok help before a pull out the rest of my hair got an rcd that trips when ring main breaker turned on got continuity but still trips when only live connected ant ideas
 
OP is saying he has only lives connected, energises mcb & then RCD trips. That 'lecky is going somewhere, and as already suggested there must be a parallel path to earth. Even 16 MΩ sounds like there's an issue somewhere, connected load or earth fault.
 
ok so got continuity not shorts insulation resistance low but not too low at 16meg and again all I have connected or two lives of the ring no neutrals for any circuit no earths for any circuit. RCD stays on until I turn the breaker on. Never come across a fault like it
Why would you energise without cpcs connected (let alone neutrals)?

This is not a safe way of fault finding.
 

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