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Please don't all kill me here but,

I replaced 3 lights tested those 3 and all working. Went to do a 4th a restored power and now the rcd trips.
Put everything back to how it was and no power to any outgoing circuits but all circuits have 240v.
No tripping at all unless I put in a plug top tester and the rcd goes
Split board 2 rcds, this is a job for a friend who won't be friends with me much longer.

I assumed if I remove lighting circuit (l, n, e)
that I worked on that would restore power to all other circuits but the problem remained
Any ideas?
 

Avo Mk8

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If this tripping has only started since you worked on the lights, it sounds like you may have inadvertently put a neutral back in the wrong neutral bar of the split board. eg with the circuit you are putting the plug top tester into , possibly the current fed from that RCD is going to a different neutral bar, so not back through the RCD, so there's an imbalance in L and N current of the RCD and it trips.
Just a thought. 🤔
 

timhoward

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I was about to ask the same question - how are you measuring this.
I'd say you have two different issues:
1 - why are you seeing 240v but nothing works ( if the measurement is reliable there is a Neutral issue somewhere, possibly something dislodged in consumer unit when you disconnected the lighting circuit)
2 - why is the RCD tripping.
 
OP
L
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I was about to ask the same question - how are you measuring this.
I'd say you have two different issues:
1 - why are you seeing 240v but nothing works ( if the measurement is reliable there is a Neutral issue somewhere, possibly something dislodged in consumer unit when you disconnected the lighting circuit)
2 - why is the RCD tripping.
Rcd doesn't trip anymore stays in but no power to any loads
 
OP
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Not a volt stick?
If the rcd test buttons no longer function and you have no power you may need to look if an rcd has tripped elsewhere, before the board.
No not a volt stick, there is only 1 board next to the metering, both rcd test buttons don't work but I thought that was a mechanical test and rcd can still operate if that doesn't work. I also tested at each breaker with rcd off and get no reading then 240v when rcd is on.
I have never seen this before, its extremely frustrating.
 

timhoward

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Really appreciate all the advice, I went back with a more logical approach and tested everything, tails all good but no neutral when the main switch was on.
Replaced main dist board switch and all back on, I think I lost a bit of common sense and it was late in the day.
Glad it's resolved just weird how a lighting fault came up then the main switch failed.
Glad you got it sorted. Yes, that is a rather horrible coincidence!
 

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