Ask The Trades - RCD trips after 5-10 mins

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Ask The Trades › DIY Forum › Electrical Questions › RCD trips after 5-10 mins

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RCD trips after 5-10 mins (Read 7280 times)

peter

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RCD trips after 5-10 mins
Jan 29^th, 2005, 5:33pm

My RCD trips after approx. 1min on my new CU 17way split
load.

Ive tested and checked physically all the plugs on the ring using an electric mains plug tester and found no problem. I have two fused spurs running off the ring both are not in use and fuses removed at present both also wired ok.

The MCB is not tripping for the sockets its just the RCD. I assume this is supposed to happen if problems on RCD protected ring.

There is no load on any of the sockets when this occurs.
The downstairs ring circuit is the only one connected to RCD side at this time and is part of a newly built extension.

Does anybody have any ideas what the problem may be any help is greatly appreciated.

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scotspark Trade Member Offline mmmmm it's gonna cost you!! Posts: 3074 Total Thanks: 10 For This Post: 0 scotland Scotland Gender: Trade: Electrician	Re: RCD trips after 5-10 mins Reply #1 - Jan 29^th, 2005, 6:08pm mis balanced neutrals at db????????? have you removed the link between the 2 neutral bars??????????
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peter Junior Member Offline I love YaBB 1G - SP1! Posts: 14 Total Thanks: 0 For This Post: 0	Re: RCD trips after 5-10 mins Reply #2 - Jan 29^th, 2005, 6:31pm Thanks for reply scotsparks The CU is split load, a side for non RCD nuetrals and a separate block for RCD protected circuit, the only neutrals on the RCD side are the two from them protected MCB. Will there be another link that needs removing ?
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scotspark

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Re: RCD trips after 5-10 mins
Reply #3 - Jan 29^th, 2005, 6:41pm

[quote author=peter link=1107020035/0#2 date=1107023519]
Thanks for reply scotsparks

The CU is split load, a side for non RCD nuetrals and a separate block for RCD protected circuit, the only neutrals on the RCD side are the two from them protected MCB.

Will there be another link that needs removing ? [/quote]

there is often a copper link between the neutral bars that needs removed to use as a split load unit. just like you had to cut the busbar

brown to red and blue to f****&&&&ommited!!!!!!!!!!!!!!!!!!!!!!!!!!!

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peter Junior Member Offline I love YaBB 1G - SP1! Posts: 14 Total Thanks: 0 For This Post: 0	Re: RCD trips after 5-10 mins Reply #4 - Jan 29^th, 2005, 6:58pm Ive checked this scotspark and can not find any link to the neutral blocks, there is a plastic spacer dividing both. Should i try the MCB in the NON RCD side and see if it trips.
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scotspark Trade Member Offline mmmmm it's gonna cost you!! Posts: 3074 Total Thanks: 10 For This Post: 0 scotland Scotland Gender: Trade: Electrician	Re: RCD trips after 5-10 mins Reply #5 - Jan 29^th, 2005, 8:43pm It sounds like some sort of fault at the board to me can you post a couple of pics by any chance????????????
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Beanzy GDPR opt-out Total Thanks: 10 For This Post: 0	Re: RCD trips after 5-10 mins Reply #6 - Jan 29^th, 2005, 9:14pm No Kitchen stuff plugged in? Fridges & freezers are a bu99er for doing this.
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scotspark Trade Member Offline mmmmm it's gonna cost you!! Posts: 3074 Total Thanks: 10 For This Post: 0 scotland Scotland Gender: Trade: Electrician	Re: RCD trips after 5-10 mins Reply #7 - Jan 30^th, 2005, 9:01am I was assuming nothing was plugged in at all Quote: There is no load on any of the sockets when this occurs. but if there is unplug everything and then try
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peter

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Re: RCD trips after 5-10 mins
Reply #8 - Jan 30^th, 2005, 12:23pm

Yeah i have nothing pluged in.

Unfortunatley have not got camera to send photos.

The CU is setup as follows

Main switch having tales from supply entering above switch.

From under the Main switch a neutral bar connects to block terminal for NON RCD neutrals.

This block is than supplying (via a tale) neutral into RCD on opposite side of board.

From under main switch it supplies live to above RCD switch.

The RCD then supplies seperate neutral bar from under switch to a seprate neutral block.

Both side have own bus bar to connect with MCB's.

I hope above makes sense, would appreciate any advice.
???

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Beanzy

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Re: RCD trips after 5-10 mins
Reply #9 - Jan 30^th, 2005, 2:51pm

Have a fault finding checklist you can work through. It's yet to fail me if it's followed to the letter, even with finding external faults. I'll host if on my webspace, but won't get the time to do that until this pm. I didn't write it and it's not my copywright, so don't link it on other places.

Will update once I've go it on there.

Kiss

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peter

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Re: RCD trips after 5-10 mins
Reply #10 - Jan 30^th, 2005, 3:06pm

Thanks BEANZY

Ive Connected the downstairs old existing house sockets (MCB)to the RCD side of the board. It has been working ok for last hour.

Normally the RCD trips within 5 to 10 mins when i had new ring connected.(downstairs sockets new side).

Just connected new side also to see if it trips. Ive now got both rings for downstairs sockets on RCD. will post results later, maybe this will help. Undecided

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Beanzy GDPR opt-out Total Thanks: 0 For This Post: 0	Re: RCD trips after 5-10 mins Reply #11 - Jan 30^th, 2005, 11:45pm I've been trying to stick that PDF on the web for a bit now but my web host is coming up with an error. If you PM me an e-mail I can send it direct.
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Chaddy GDPR opt-out Total Thanks: 0 For This Post: 0	Re: RCD trips after 5-10 mins Reply #12 - Jan 31^st, 2005, 6:16pm Beanzy any chance you could mail it to me as well???? Cheers Ken
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Beanzy GDPR opt-out Total Thanks: 0 For This Post: 0	Re: RCD trips after 5-10 mins Reply #13 - Jan 31^st, 2005, 8:03pm No prob. just send e-mail address as a PM and I'll pop it off. Although I'm determined to beat this hosting glitch too
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