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First random trip happened 2 weeks ago, then once in last week. Instant tripping started 3 days ago. Called an electrician, who suspected short-circuit and changed quite a few old sockets, replaced the old mcb(all mcb no rccb). Tested and it lasted for 5 minutes. Suggested full wiring inspection, which is very expensive for my budget. Turned the breaker on again after he left, this time it lasted 6 hours, next time was 16 hours, and then 3 hours, all without plugging in extra appliances, just a fan or a light running occasionally. As of two hours ago it is back to it's instant trip phase.

I would like to know what I might be dealing with here? can't be overload without load? using the same setup for past 4 years, no faulty devices as they are running fine on power outlet from other rooms. Short-circuit? is a major suspect but the irregularity of trips is casting doubt on that too. And is the diminishing interval between the trips any kind of pattern? like static/current buildup if that is even possible.

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    Current can't build up. Have you unplugged and turned off absolutely everything you can? Not sure where you are located, you might also try turning off all the other breakers and then turning on one at a time until the problem comes back. Of course if this is a ring main setup with few breakers that's not going to tell you much, but it's something at least.
    – KMJ
    Jul 13, 2023 at 23:32
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    Not quite sure what a MCB is, but if the new replacement is doing the same, then maybe a tiny break/problem in the insulation somewhere. Very good(expensive) tools that an electrician should have should find it. A light circuit might be able to use a plain circuit breaker(if allowed) and fix it, but with a different circuit it might be dangerous to you.
    – crip659
    Jul 13, 2023 at 23:33
  • Thank you for replying, I'm not knowledgeable when it comes to this and was just looking for patterns Jul 13, 2023 at 23:34
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    MCB is short for Miniature circuit breaker, the one in question is single pole upgraded from C10 to C16. I'm from Dhaka, electricians here mostly use cheap equipments. Everything is unplugged and it still flips. Jul 13, 2023 at 23:39
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    If the breaker trips with it's load wire disconnected, the breaker is bad. If it doesn't but the breaker flips with everything unplugged, house wiring is bad.
    – keshlam
    Jul 14, 2023 at 0:09

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Found the problem. I share a wall with my next door neighbor. Due to some unfortunate drilling on her side she damaged the wires inside my side of the wall. Though I disconnected that wall outlet years ago, apparently the damage grew over few months leading to current situation.

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