General > General Technical Chat
Issues with circuit breaker/RCD randomly tripping
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edpalmer42:
Have all the outlets been inspected?  Maybe spiders/ants/wasps built a nest in one (particularly the outdoors ones).

Has the weather been consistent while this problem has been occuring?  Evening - things cool down enough to cause condensation inside an outside outlet that combines with some dust or dirt to create a path?  During the day everything dries out and works fine.
andy3055:

--- Quote from: Halcyon on August 11, 2021, 05:26:11 am ---
--- Quote from: andy3055 on August 11, 2021, 04:29:43 am ---Agree on the replacement of the breaker. Sometimes even if they are not bad per say, they can trip due to age related deterioration. Also, have the electrician check the lugs that make contact with the breaker (don't know the correct term) in the panel. Just a thought.

--- End quote ---

We don't have "lugs" here. The breakers sit on a normal DIN rail and the cables screw directly into the breaker. As long as the screws are nice and secure, it'll be a good connection.

--- End quote ---

Are you saying both sides of the breaker are screwed on type? I know the load side is. In the US panels, the supply side is not screwed.
andy3055:
I just remembered this. You could be having a loose neutral in one of the sockets on that circuit. It could even be a loose live wire. But mostly I have seen a loose neutral doing that.
MrMobodies:
I once had a rusty pump that started to leak and it would trip the whole fuse box if the rcd for that circuit was switched back on.

It was intermittent at first and everything would come back on when resetting the main RCD. Then it would just reset until I switched all the other switches off and I traced it to the boiler switch and found the pump was slowly dripping.
james_s:

--- Quote from: andy3055 on August 11, 2021, 06:26:55 pm ---Are you saying both sides of the breaker are screwed on type? I know the load side is. In the US panels, the supply side is not screwed.

--- End quote ---

Most places outside of North America use DIN rails just like the ones we used in our industrial equipment. The breaker clips to a mounting rail and has screw terminals on both sides.
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