New DB instal in my house and rcd tripping please help

[Bruley88]

Hi all
I'mhaving trouble with a new instal its a spilt board 10 way DB
first half of the board has
down stairs lights
upstairs sockets
boiler
second half
kitchen
upstairs lights
and down stairs socket

The problem im having is the downstairs light in the hall is tripping the both rcd when turned on, I then removed the circuit from the rcd and wiring straight into MCB not touching the rcd just to fault find.when light is then turned on the rcd which is used to be run through doesn't trip but the second half of the DB trips the rcd although this rcd has nothing to do with the downstairs lights.
I have checked the factory wiring which runs from neutral terminal to top on both rcd each rcd neutral then runs to its own bar. I wired the circuit straight into the neutral terminal where rcds get there neutral feed from but still tripping second rcd.
sorry for rubbish explanation im a three phase and panel guy so this is abut out the ordinary for me any help would be great appreciated.

 

[telectrix]

It only happens with the hall light all other light down stairs work fine. I was thinking a borrowed neutral but didn't want to jump to conclusions. Well that the thing the light circuit is no longer on the rcd it's just run through the MCB but still knocking the second rcd off.

probably because the N for that circuit is still in the RCD N bar.

 

[andrewokeeffe]

Borrowed neutral

 

[Knobhead]

Be interesting to see which of you start moaning there’s no work about.

 

[Octopus]

Be interesting to see which of you start moaning there’s no work about.

Won't be me. he, he.

 

[UNG]

Something odd here a guy that does 3 phase and appears to have not come across an RCD on a 3 phase system and appears a bit light on single phase knowledge mmm

 

[telectrix]

i prefer 3 phase. there's more chance of getting at least one of them right. :waving:

 

[bigbaddave]

Time to come clean. Who fitted the board? what tests were done? Do you have an EIC? Was it notified?

Ha Ha, That made me chuckle.. I suspect that we allready know the answer..

 

[GLENNSPARK]

Get whomever fitted it back to fix it or stick both lighting ccts on the same rcd not ideal but better than nothing

same MCB more like...