Earth leakage trips at night??

[Jongseun]

I narrowed down the tripping problem. When I disconnect the neutral of the light circuit (Main bedroom, main bathroom, study & bedroom light), the tripping stops. I’ve inspected the light fittings and it all looks in proper working order, I replaced the main bathroom light fitting…….So I also think moisture or the cold weather could be the culprit here, but how will I fix something like this?

[murdock]

that could explain why it trips at night.

[Jongseun]

The funny thing is last week I did not have any trips, I did not disconnect anything.....and last week it was freezing here in Jhb! very strange, and very irritating!

[AndyD]

I admire your tenacity but if you haven't managed to pin the problem down by using elimination in the last three weeks then it might be time to call in the big guns (qualified electrician) or try your hand with a Mega tester if you're competent to know how to safely isolate and how to use one. Chances are the tripping is a cumulative issue where more than one or possibly even several IR faults are adding up to more than the 30mA tripping threshold.