New install lighting circuit tripping

[prhambly]

Installing some lighting in a new extension. The RCD is tripping, and it's doing my head in. I can't work out if the problem is upstream or downstream of my junction box.

Basically I have 1 in and 7 out via wago connectors. L, N and E. The live feeds go to various switches,

If I remove both neutral and live IN, it doesn't trip. 240v detected across L and N
If I just remove live IN, it trips.
If I connect the L to any of the 7 outs individually, with N connected, it trips.

So the question is: where's the leak? If nothing has a live feed, how can there be a leak?

Note there is no load on any of the circuits yet. I had turned it on to test some lighting sockets, but never got that far. I have also installed normal sockets which are working and tested, as well as feeds for an aircon and a blind, none of which were turned on at the CU while this was going on

Thanks in advance

P

 

[EFLImpudence]

A neutral touching an earth will cause an RCD to trip.

 

[prhambly]

Thanks! I presume that means it's downstream of the junction box?

 

[EFLImpudence]

Thanks! I presume that means it's downstream of the junction box?

If you mean that is all you have altered then - presumably.

 

[prhambly]

Well I've installed the consumer unit and the feed to the junction box too.

I'll take out all the neutrals and add them one by one. If they all trip it then I'll assume it's upstream

 

[pete01]

If you can't rectify a simple fault you shouldn't be installing consumer units.

 

[EFLImpudence]

Well I've installed the consumer unit and the feed to the junction box too.

Circuit neutral in the wrong CU neutral bar then.

I'll take out all the neutrals and add them one by one. If they all trip it then I'll assume it's upstream

Do you mean in the CU or your light cables?

 

[prhambly]

light cables

 

[EFLImpudence]

Ok. That will narrow it down if all except one don't trip.