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A

adam.h

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Changed my cu yesterday and all seemed fine. Not added any new circuits as yet. But I turned on one of the kitchen lights (there are 3 sets of downlights) and it tripped both rcds. I couldnt reset the rcd at first but it did after a while, not good....... every thing worked but this one set of lights. Not got time to look at it tonight (it just happend) But why would it trip both RCDs?
I will look further into it tomo, but if anyone has any info that may help would be good.
Cheers!
 
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im guessing you have a split rcd board and you have 1 lighing circuit and 1 on another and the 2 circuis have borrowed neutrals


did you take readings after changing the board
 
A

adam.h

  • Thread Starter Thread Starter
  • #3
im guessing you have a split rcd board and you have 1 lighing circuit and 1 on another and the 2 circuis have borrowed neutrals


did you take readings after changing the board

ahhh, could a borrowed neutral do that? The kitchen was re done a while back (I didnt do any of it as I was not qualified back then) But I did find that the front room lights had been a live link in the switch for the back room (the rooms where knocked through into one many many years ago) and the back room light had a borrowed neutral from somewhere. But the back room is now part of the extension so new light circuit wired but not yet wired into the cu.
all downstairs lights are on one rcd and all up stairs are on the other. if there is a borrowed neutral and this one light circuit now has a fault would it cause both to trip?

mate who has been a spark did testin and said all was fine. But imgoing to re test everything again tomo.
 
C

cjddj

  • Thread Starter Thread Starter
  • #4
As stated, borrowed neutral is favourite, or a line coming from one half of the board and the corresponding neutral wired to the neutral connector belonging to the other half.
 
A

adam.h

  • Thread Starter Thread Starter
  • #5
Cheers peeps. Though I thought normally a shared neutral would have been from the stairs landing, and they work fine. I got a feeling there might be a fault as all the other kitchen lights work with no problen at all. But then again, the kitchen was extended many many years ago too and I dont know how it was wired when the new kitchen was installed.
All fun stuff
 
G

gunner

  • Thread Starter Thread Starter
  • #6
cant help notocing you say all upstairs and downstairs lights are on rcd,s.only the bathroom lighting needs to be protected by rcd
 
M

m4tty

  • Thread Starter Thread Starter
  • #7
I thought that if the cables were not buried more than 50mm deep etc etc it needed to be rcd'd. :confused:
 
A

adam.h

  • Thread Starter Thread Starter
  • #8
I was under the impression that they had to be now?
 
S

Spudnik

  • Thread Starter Thread Starter
  • #9
They do, unless it can be proved otherwise.
 
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Reply to RCD Tripping in the Electrical Forum area at ElectriciansForums.net

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