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 Post subject: rcd tripping
PostPosted: Sun Dec 31, 2017 10:03 am 
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Hi. A few months ago i had the fuse board replaced with a new one in my property. It has two rcds on it to cover 2 different circuits. One is 63a and the other is 80a. It's the 63a (or 62) that keeps tripping.
Not long after installation one of the rcds kept tripping which i found to be the element in one of the ovens. This seemed to cure the problem.
The rcd still trips- only if its raining or really damp and only between 9am and 10am..
The only thing i can think of that may cause a problem is our solar panels. What do you guys think? It's driving me crackers at the moment..
If anyone has any other suggestions or advice please feel free to have a go. Thanks


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 Post subject: Re: rcd tripping
PostPosted: Sun Dec 31, 2017 11:48 am 
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Intermittent tripping can and is a pain to find. :cb

Being as its an RCD is twice as bad since it can be a Live problem or a Neutral problem.

The simplest way to find it is to disconnect things for X time. So if your RCD trips once every 24 hours, then you need to disconnect stuff for 25 hours (It covers the 24 known hours) As it can equally be a Neutral fault you need to disconnect both Live an Neutral, switching something off is no G'tee unless you know it has a double pole switch.

Knowing what time it trips is good because it means its likely to be something that happens at that time. (But that said if something gets wet, it may take a while for it to trip)

If it happens when its raining or damp that would imply either you have a leak (and water is getting in) or its something external, lights, sockets.......solar panels

I wish you luck.

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 Post subject: Re: rcd tripping
PostPosted: Tue Jan 02, 2018 4:17 am 
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Yesterday was interesting. Dry weather in the morning so no problems. Then at about 1pm it started to rain and within about 5 min the rcd tripped. I switched off the isolator switches for the solar panels and the rcd never tripped again.
I will have to get on the roof and investigate i think..


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 Post subject: Re: rcd tripping
PostPosted: Tue Jan 09, 2018 2:24 pm 
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Update:
Since isolating the solar system i have had no trouble. I called SMA (the manufacturer) today and they said i need a 100ma rcd as opposed to the 30ma rcd that's in already. They recon that is causing the cd to trip. Odd how it does it only in damp or rainy weather..
From what i know, 30ma is regs isn't it? What can i do now? Any ideas..


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 Post subject: Re: rcd tripping
PostPosted: Tue Jan 09, 2018 3:52 pm 
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There are three sizes quoted in the regs, in the main 30 mA but for fire protection it also quotes 300 mA and 500 mA however what matters is how the cables are run and what cables are used. SWA and Al-tube do not require RCD protection, neither do cables you can see, so you could use a delayed (S type) and in the main sizes go up by a factor of 3, so 10 mA, 30 mA, 100 mA, 300 mA and 1 amp.

However although you could do it, I would say any domestic item today should be able to run with a 30 mA trip, larger sizes are for commercial use where the installation is not in the control of an ordinary person. I would be looking at RCBO for the solar panels so only the solar panel goes through that RCD.


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