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Discuss Problem with 2 way landing whilst replace consumer unit in the Australia area at ElectriciansForums.net

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bodge64

I have just fitted a Dual RCD split board consumer unit to an existing installation. I wired the upstairs lights to one side and the downstairs lights to the other but when the landing light was switched on the RCD tripped so I looked inside the switches and the feed to the downstairs switch was shared with a hall light.I suspected an imbalance triggering the RCD. I then connected both upstairs and downstairs to the same RCD but had the same problem ,also with the other RCD. Does anyone have any suggestions please?
 
I then connected both upstairs and downstairs to the same RCD but had the same problem ,also with the other RCD.

Very unlikely and i shouldn't really ask this, but you haven't gone and had one of those blonde moments we all get time to time :), and moved the lives on to the same rcd and forgot the neutrals and left them seperate :eek:
 
thanks everyone! If I chase a neutral from another upstairs light should this do the trick? Not to familiar with domestic installations but more industrial!
 
I agree with Des 56. It is quite possible that you have either A) got your Neutrals mixed up between the split load bars or B) your Neutrals are correct and it is the Line conductors that are infact mixed up. This would seem to be pointing in the right direction I think as you mentioned that putting them together on both RCD’s respectively did not rectify the problem. This is an easy mistake to make and I know this speaking from experience.
Can I ask were or are the cable conductors easily traceable in the consumer unit and did you definitely identify the ends? I say this because sometimes what you think is Neutral or a Line of a cable may turn out to be one of another (especially if cables are compacted and tight and come through same hole).
I hope this makes sense. Even I got confused for a minute :)
I work for a housing association on voids and I find a lot of the time the "borrowed Neutral" setup where by there is usually a 2 gang switch in the downstairs hallway, one for the hall light and one obviously does the landing light. It is wired in what us lads call the "Cheshire Two Way" set up where the feed is looped from the common of the hall light over to the common of the 2 way and then a 2 core twin is sent to the upstairs landing light and thus a single core (Red) to the landing light.
As a rule of thumb and to keep within our spec we have to rewire it and pull in a new 3 core cable and a new twin to the light. Bit of a pin but I prefer this than running a new neutral between the upstairs and downstairs light.
Does the above sound like what you have?
 

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