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I’d be keen to hear your thoughts on 1 of my customers problem.
Split board, TT system. Located in a village, neighbours report no problems.
Customer getting random tripping of sometimes 1, sometimes both RCCD’s. Totally random, no particular reason. I’ve tested the installation, nothing showing up out of the ordinary. Customer keeps a log of when these events occurs.
Tested both RCCB’s numerous times, nothing untoward. Replaced 1 with another known good 1, no difference. Moved some circuits around to try and find what’s tripping, and added another board with RCBO’s, fed from MCB from main board ( after main switch, before RCCB’s). These trip very occasionally.
Nw I’m starting to think that this maybe a supply fault, as sometimes the customer says the power comes back on without him resetting anything. Have known RCCBs to trip when power is restored, especially after a very small outage.
Ze is low for a TT around .14, measured many times.
Your thoughts gentlemen please.
 

DefyG

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Could be DNO problem;
Got called to investigate same problem, no obvious faults within premises.
Later that night my client was witness to a 'wonderful firework display' as they called it when a pole transformer exploded and caught alight.
Tripping fault disappeared after transformer replaced! and been ok since (approx 7years ago).
 

littlespark

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Trying the basics, here… but have you checked any appliances still plugged in?

Number of times it’s been: “yes, everything’s unplugged…” but either it’s just turned off at the wall, or there’s an old freezer in the garage
 

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