Intermittent RCD Tripping - opposite side of board

[Hollinbusk]

I think it's got to be a bit of trial and error here. Could even be something happening that's purely coincidental. test circuits for IR where possible.

Yes I agree, will be doing IR’s on next visit, just wanted to try and make sense of how it can happen ….. for my own sanity lol.

 

[Chivers]

My Wife's friend had an RCD keeping tripping. Turned out to be a Fridge

 

[Brains]

Cant get my head round this

I understand N-E faults cause RCD's to trip, but I cant understand why on these 2 occasions, googled allover but no real answer. I have 2 intermittent faults on the go, one Dual RCD board, one split load, 1 RCD.

Dual 2 RCD
Occasionally the left RCD trips when load is used on right, not a new install, no alterations and no crossed neutrals as far as I'm aware (assume this would have caused issues on board install if crossed neutrals day 1). Both RCD tests done and working fine .

Split load 1 RCD
Intermittent RCD tripping, seems to be when turning oven off (oven fed from non RCD side of board)

Any explanations appreciated.

Suggest you check both for excessive leakage current by carrying out differential current test using a leakage current clamp meter such as Megger DCM305E.
Also check for insufficient insulation resistance.
Check load profile vs RCD type

 

[Hollinbusk]

Suggest you check both for excessive leakage current by carrying out differential current test using a leakage current clamp meter such as Megger DCM305E.
Also check for insufficient insulation resistance.
Check load profile vs RCD type

Thanks for your reply, yes I will be returning with a leakage clamp - can you explain why the RCD's are tripping the opposite side ? especially when the single board RCD is tripping with a circuit on the non RCD side ? - cant seem to get an answer off anyone