RCD tripping after moving MCB | Page 2 | on ElectriciansForums

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hotspothannon

Hi all...advice needed.
I have just replaced a MCB on my girlfriends board...as it was faulty and tripping intermittently. Whilst doing that I decided to 'tidy' up the board as it's a bit of a mishmash with labels and such. Whilst labeling....I went through the whole house finding what MCB fed what, now I found a 16amp MCB labelled 'immersion heater'. This took my interest as I knew she had this ripped out when she brought the house 10 years ago. I finally found this one breaker fed one single socket in her kitchen. This breaker was on lighting side of the consumer unit ie 'no RCD' protection. Behind the said single socket there is a pair of twin n earth, one connected to the supply on the socket, one left in the back - which is dead. I can only assume someone broke into the immersion heater supply and made this single socket part of the radial circuit.
I decided to just move the MCB over to the RCD protected side of the bus bar.... And that was that...labeled it up...everything great. Great until she came to use it. Normally all she had plugged in it was a 'air freshener'.... And this was OK. However we seen since you plug anything else in then as soon as it's switched on - the RCD trips. This is with any appliance, except ones without an earth...ie air freshener, phone charger etc.
Now here's my question.....would it be OK just to put the MCB back to the 'non RCD protected' side....where it worked perfectly well for 10 years? I have tried to find the route of the cable but it is in the kitchen behind a tiled wall right next to the door frame. I can't even make out if the cable goes up or down. Downstairs she has solid wood flooring ( so that ain't coming up) ....upstairs I have had the carpet up where all the old immersion heater was, and all the old wiring, however the feed to the single socket is not there.
I'm thinking there is a N-E fault somewhere...but it's like where????
Any advice would be appreciated
 
When you have the line supplied via RCD but the neutral not, this will cause an unbalanced load on the RCD, so it will trip when a load draws current. Move the neutral over to the RCD neutral bar and problem should be solved!
 
When you have the line supplied via RCD but the neutral not, this will cause an unbalanced load on the RCD, so it will trip when a load draws current. Move the neutral over to the RCD neutral bar and problem should be solved!

What, like Tel suggested in post No.3?

Do keep up at the back! :6:
 
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