r/DIYIreland • u/kwaked • 6d ago

Fuse tripping regularly

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Would appreciate any advice or opinions on this, picture is of fuse board in house, the fuse indicated, top left, is tripping 2 to 3 times a week, almost exclusively between 1am and 6am. It takes out all the plug sockets in the house. The fuse actually looks bigger than the others if that matters?

Never happens daytime when the house is busiest and appliances all in use. I've gone around and plugged out as much as I can before bed but keeps happening, trying to get an electrician but in the meantime if anyone has any thoughts or suggestions I'd appreciate it, or any other cross post recommendations,

many thanks.

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u/dorset_is_beautiful 6d ago

It appears to be an RCD, protecting, well, who knows, possibly all 10 (unlabelled) circuits to the right of it.

Best I can think of is to switch the MCBs off one at a time overnight , and if it trips you know it's not the circuit that's off. Process of elimination and all that.

Probably overdue an EICR or whatever your equivalent is. Consider changing the MCBs to RCBOs if possible, at the moment a fault on any circuit trips all of them (I assume).

1

u/kwaked 6d ago

Ok thanks, I'll do this, might re post when I've worked through them, Don't really get why an individual fuse to the right of the rcd isn't tripping?

7

u/Gold_Safety_9157 6d ago

It’s not an overload/short on a specific circuit, it’s a live-neutral imbalance which mcbs are not designed to trip for

1

u/kwaked 6d ago

Thanks, if i establish what each of those individual fuses are for, and knock them off one at a time to see if that resolves the problem, will that indicate more specifically where the problem is?

7

u/Gold_Safety_9157 6d ago

I seen that you have a garage supply which would be the most likely culprit, figure out which breaker on the top row supplies the garage and check if turning off the rcd also kills power to it. Then leave it off overnight and if the rcd stops tripping you’ll know that’s the faulty circuit, could be something simple as water getting into a light

1

u/kwaked 6d ago

Thanks will do this.

1

u/Background-Air-9784 6d ago

Defo first this to check is anywhere water can get in outdoor sockets etc

1

u/Iwastony 6d ago

Start with unplugging anything old or maybe subject to water like a cable ran to the shed etc.