Replacing 63A 30mA trip

mikeecho · 25-06-2023 10:01PM #1

Which one should I get?

This is what I have.

IMG20230625213012.jpg

and these are what I'm looking at

1. https://www.dwyers.ie/product/hager-63a-30ma-type-a-dc-2-pole-rcd/

2.

https://www.dwyers.ie/product/hager-63a-300ma-2-pole-a-curve-rcd/

Which one do I need?

Lenar3556 · 25-06-2023 10:17PM

No. 1

mikeecho · 25-06-2023 10:19PM

https://www.boards.ie/discussion/comment/120765138#Comment_120765138

Ahhh.. I just noticed 30mA & 300mA

Thanks

mikeecho · 25-06-2023 11:41PM

By the by .. the reason I'm looking to replace the trip switch, is because it trips completely randomly.

This has been going on for years.

During that time, the immersion, dishwasher, washing machine, dryer, cooker, toaster, kettle microwave have all been replaced.

When I go in holiday everything is unplugged, and yet it still happens, I suspected the fridge, but this time I unplugged the fridge while away, and the trip still went.

It trips at completely random times, usually when the house is unoccupied, but not always.

Risteard81 · 26-06-2023 03:53AM

Far more likely to be a fault thana faulty RCD. Although it's still worth replacing it with a Type A. This isn't DIY work though so not sure why you're sourcing the device.

JL spark · 26-06-2023 07:31AM

Get a REC in with a tester , might not be the rcd , and as said above, that’s not a diy job to change

mikeecho · 26-06-2023 03:55PM

I thought it would be fairly straight forward.

Disconnect power.

Remove cover

Swap out rcd.

Reassemble

Power back on

Antenna · 26-06-2023 06:31PM

https://www.boards.ie/discussion/comment/120765623#Comment_120765623

Check behind all sockets , in junction boxes for buildup of dust, dirt, grime etc (and remove) , it could be slightly conductive between L and E., or issues of moisture behind sockets ? It would also be an opportunity to check if all terminals are tight and look for other issues (damaged insulation etc).

mikeecho · 26-06-2023 06:49PM

https://www.boards.ie/discussion/comment/120769286#Comment_120769286

There's about 40 double sockets around there house, maybe more .

It'll be quicker to rule out the trip.

But thanks for the advice, it's something I'll look into.

Sleeper12 · 26-06-2023 07:42PM

By law only a REC can do this job. This is why it's been suggested that it's not a DIY job. Where I personally believe a REC is the best option is because they may spot something a miss that you wouldn't. They also have, annually calibrated, testing equipment that you won't have so they will be doing more than replacing a trip switch.

10-10-20 · 27-06-2023 11:11AM

https://www.boards.ie/discussion/comment/120769367#Comment_120769367

https://www.boards.ie/discussion/comment/120769652#Comment_120769652

As a keen DIYer, I'm in agreement here as a REC has the test equipment to identify the source of this and messing around in a consumer unit isn't safe at the best of times. There are live exposed bus-bars there. Keep safe, we prefer to have you still posting afterwards. 😁 👍️

kirk. · 27-06-2023 07:45PM

Its unlikely that rcd is faulty

Can't say i came across too many trips that wasn't a wiring fault

If the installation is big you might need separate rcbos sometimes

Antenna · 28-06-2023 10:28AM

Is it possible a nail or a screw has pierced a power cable in a wall ?

this could happen hanging pictures, installing cabinets on a wall etc

If it didn't firmly short out the supply, you could have intermittent issues like above

mikeecho · 28-06-2023 12:04PM

I've had this problem for about 10yrs.

Completely random.

Usually goes when I'm on holiday, and most things are unplugged, but can go when I'm there as well with everything plugged in.

I could go months without the trip going, and then it could be twice in a week.

kirk. · 28-06-2023 12:07PM

https://www.boards.ie/discussion/comment/120776566#Comment_120776566

Probably not that i would think

Can't say I ever noticed much issues with faulty rcds . Sometimes a delayed trip on new work or an old one seized up or won't reset.

They can trip over 15 ma so 'standing leakage ' plus something minor can trip it

Rain then for an occasional trip always a possibility

Testing might find something or maybe separate rcbos if nothing shows up

mikeecho · 27-02-2025 04:19PM

Just an update. I haven't had the rcbo replaced yet, but I was reading on a solar PV Facebook page, that the regs were updated last year, (from 30mA) to allow 100mA 32Amp rcbo for the PV rcbo.

Is it the same for the regular rcbo in the house ?

I might just get both replaced, when I'm getting some electrical work done this year.

CiaranMT · 04-03-2025 10:54PM

You have an RCD tripping, which is different from an RCBO. The reason for the 30mA designation is to prevent risk of shock (anything above 30mA of current through the body and you'll likely die).

The RCD is monitoring whatever MCBs are fed off it. I see the immersion is one of them, do you know what else is on this? It could be an accumulation of residual current from the various circuits that causes the RCD to trip. You could put each circuit on RCBOs and so you'll more quickly identify the circuit causing the trip, but it wouldn't be that cheap.

Like others have said, it's a job for a qualified electrician really. They'll come in and identify the trip fairly quickly. With any luck it'll be an easy fix, and won't require any work at the board.

Lenar3556 · 04-03-2025 11:26PM

https://www.boards.ie/discussion/comment/123215955#Comment_123215955

I believe 100mA is now permitted for the inverter connection to deal with nuisance tripping issues.

Everything else should still have 30mA protection fitted. As the last contributor has advised, the problem is often the cumulative effect of small leakages from multiple circuits and the most comprehensive solution is to fit individual RCBO’s (MCB and RCD combined for each individual circuit)

mikeecho · 05-03-2025 07:37PM

https://www.boards.ie/discussion/comment/123232361#Comment_123232361

The thing is, the tripping is completely random.

It could happen a few times a day.. few times a week. Or not at all for 6 months.

One summer we went on holiday, and I unplugged everything, including the fridge.

It still tripped.

This has been going on for years, we've replaced many appliances over the years, and it still happens.

I just can't narrow it down.

Cerco · 08-04-2025 01:24PM

Do you have any outdoor sockets or lights running from an internal socket?

Hotblack Desiato · 23-04-2025 03:22AM

About 18 months ago we had had infrequent random tripping over a period of months which started to become more frequent. Then one morning it tripped and wouldn't reset. This is what it looked like when the REC replaced it:

Replacing 63A 30mA trip

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