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Another tripping RCCB


CallumWK

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I have followed @carlyai thread with interest, as I have a similar issue, in my maid's quarters.

The maid's quarters is about 30 meters from the house and fed by an underground cable coming from the main house, and on a circuit that has a 63A RCCB.

 

MQ has never been occupied, and for the last few years the RCCB in the house tripped maybe once every few months, which I attributed to the pool pumps being on the same circuit. But when I closed the RCCB again, all would be fine.

About a month ago it tripped during heavy rain, and then I found out that the issue was in the MQ, because I couldn't close it until I opened the MCB to the MQ. I left it like that for more than a week, but then the problem still existed, so I started checking.

 

In the MQ there is a 2 pole 40A MCB (ABB S202M) and 5 single MCB's. Unfortunately, the breakers are not marked which circuit they cover.

Everything is switched off, I switch 2 pole MCB on, no problem. I can switch on MCB 1 and 3 without the RCCB in the house tripping.

Whenever I switch on MCB 2 - 4 or 5 the RCCB trips immediately, and can not be closed unless I open MCB 2 - 4 and 5. As said nothing is active in the MQ, nothing plugged in the sockets either.

 

I already removed all neutrals from the neutral bar, as suggested in the other thread, but that doesn't make a difference.

 

So now I would like to try another RCCB, but I'm not gonna part with 2500 baht for an ABB RCCB, just for testing purposes, so any suggestion on a cheaper/reliable brand are welcome.

 

I should add, the house and MQ have earthed electrics and are 12 years in use.

 

 

 

Edited by CallumWK
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While looking for my garage wiring circuit I found this about about a home built RCD test device.

The web site is This is Prathumthani, I think.

The information may be in the pinned threads at the start of the Electrical Forum as is from Crossy I think.20241014_045721.thumb.jpg.d50e96c3827959ef17a4f904852271fc.jpg20241014_045721.thumb.jpg.d50e96c3827959ef17a4f904852271fc.jpg

20241014_045704.jpg

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1 hour ago, carlyai said:

While looking for my garage wiring circuit I found this about about a home built RCD test device.

The web site is This is Prathumthani, I think.

The information may be in the pinned threads at the start of the Electrical Forum as is from Crossy I think.20241014_045721.thumb.jpg.d50e96c3827959ef17a4f904852271fc.jpg20241014_045721.thumb.jpg.d50e96c3827959ef17a4f904852271fc.jpg

20241014_045704.jpg

 

That's probably the only currently accessible copy of that website in the known universe!

 

The WaybackMachine is down after a cyber-attack although they say that the data is safe and they will be back "soon".

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15 hours ago, CallumWK said:

Whenever I switch on MCB 2 - 4 or 5 the RCCB trips immediately, and can not be closed unless I open MCB 2 - 4 and 5. As said nothing is active in the MQ, nothing plugged in the sockets either.

 

Time to find out what these MCBs control and investigate, I'll bet the damp has got in or the local wildlife has had a nibble.

 

If not already done, pop off all your outlets and light switches to get any damp or creatures out. Madam's hair-dryer is a useful tool!

 

Since you can get two MCBs active, check what they control (and record) so you at least have an idea what not to look at.

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