Discuss RCD tripping problems in the UK Electrical Forum area at ElectriciansForums.net

G

gavin.sibley

Hello all,

I'm having a problem with a nuisance tripping RCD, ran an RCD test on a board and results showed that RCD was knackered, swapped this out for new and tester again failed to trip the RCD, however customer is telling me of nuisance tripping 6-7 times a day whenever they try to use an appliance.

Is there any fault in a system that could cause an RCD not too trip under test, but yet trip whenever an appliance is being used. I have done all other tests on circuit and all show reasonable results for age of installation.

Thanks,
Gavin
 
Sorry just noticed you tested at board. Try testing at socket outlet, some memshield do not trip if tested at board may have a similar problem.
 
Firstly if your 'new' RCD has failed to trip on testing, you need to be replacing it again...that's obviouslly if you meant it failed to trip at 1x and 5x on both cycles.

Secondly, yes - faulty appliances can take RCD's out...i would advise on PAT testing the appliances that seem to be causing the nuisance tripping.
 
Yes that's exactly what I meant, problem is, it trips with every appliance in the house and the shower, that's why I was wondering whether there was any sort of wiring fault that could cause this problem?
 
that's what i'm thinking. retest RCD with both load L and N dissed. if it trips then, it's a wiring fault, poss. a N-E fault that inhibits your tests but causes tripping when under load.
 
Ze from what I can remember (haven't been there for a few days as customer has been away) is around 0.15ish. There is a circuit in the install which is showing a dead short between all three conductors, although this is obviously switched off in the board, could this fault possibly be the cause of the RCD failing to trip?
 

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