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After installing a new consumer unit, both rcds were tripping out. I had a hunt around for the problem and quickly found a link between the first floor lights and the ground floor lights. Seems the hallway ground floor light had a link from its common terminal to the common terminal of the other gang of the 2 gang light switch. A two core cable then went upstairs to the landing light switch marked first floor light. IR tested upstairs lights L/N to earth quite low 4.89 downstairs IR L/N to earth 18.79. Presumed the imbalance of current to two different neutral bars were causing the rcds to trip.
 
i prefer to call it a shared live. the best solution is to rewire the 2 way switching using 3 core/E and feeding the L to the landing from the upstairs light circuit. alternatively, you should put both circuits into 1 MCB. and the neutrals into the same N bar, this won't strictly comply with the division of circuits for safety ( forget the reg. no. without looking it up ).
 
i prefer to call it a shared live. the best solution is to rewire the 2 way switching using 3 core/E and feeding the L to the landing from the upstairs light circuit. alternatively, you should put both circuits into 1 MCB. and the neutrals into the same N bar, this won't strictly comply with the division of circuits for safety ( forget the reg. no. without looking it up ).


thanks, that's what I would call it too. Have already done the alternative for the time being.

here some switch ****

Hallway Light Switch

interconnected circuits 016d1b4eabcfae4750e1f9e0c41034dd0c9f04ff0b - EletriciansForums.net

Landing Light Switch

interconnected circuits 01aab722cbf31702aedaa63bb34657c95ec8ef5040 - EletriciansForums.net

In the last picture the link had been removed in the picture but was between common and common.
 
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i prefer to call it a shared live. the best solution is to rewire the 2 way switching using 3 core/E and feeding the L to the landing from the upstairs light circuit. alternatively, you should put both circuits into 1 MCB. and the neutrals into the same N bar, this won't strictly comply with the division of circuits for safety ( forget the reg. no. without looking it up ).

well.... If it's a dual RCD board it would depend on how the sockets are fused. If it's hi integrity board then slap in a RCBO and put all the lights on it. If it's RCBO board then do the same. A note on the cert too!

what has your schemes tech line suggested?
 
Last edited by a moderator:
well.... If it's a dual RCD board it would depend on how the sockets are fused. If it's hi integrity board then slap in a RCBO and put all the lights on it. If it's RCBO board then do the same. A note on the cert too!

what has your schemes tech line suggested?

it is dual rcd, sockets?

note it good idea

haven't spoke to niceic yet didn't think it was necessary..
 
i fail to see the relevance of socket circuits to a problem with a borrowed live or borrowed Neutral on lights.
 

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