Dual rcds tripping

[Davem]

Evening gents bit of advice required please I have recently finished a partial rewire (upstairs sockets upstairs lights and smokes). All is fine apart from when I turned under unit lights on in kitchen it tripped both rcds. There is 1 2 gang switch in kitchen 1 for main kitchen light and 1 for under unit I have taken link out from main light switch the under unit light switch and this rectified the problem no tripping but when I put link back in both tripped again and ideas guys cheers by the way pretty new to the game so be nice

 

[Pete999]

You need to carry out an IR test on the suspect circuit, more than likely a NE fault.

 

[spark 68]

More than likely you have one or more N in the wrong N bar if it is tripping both

 

[Zebra Stripe]

Big mistake mate with the "new to the game" and "be nice bit"..tripped both RCDs?? christ why does none of this exciting stuff happen to me?

 

[GMES]

As above sounds like crossed neutrals, time to get the tester out

 

[onions1066]

Did you check for a borrowed neutral before swapping the board?.

 

[Johnuk]

as above mate

 

[GMES]

Did you check for a borrowed neutral before swapping the board?.

I'll have a tenner on that being a no

 

[Zebra Stripe]

Hey little bit of advise, type your post up in word, then go away for 10 mins or so, then come back and read it, edit it then post it.

 

[Davem]

Back there tomorrow guys working Sundays love it so will do as advised I have tested all new installation and all is fine gotta test old bit tomorrow looking forward to it a will get back to you with results cheers guys

 

[onions1066]

It's more important to test the existing installation prior to installing a new board. It will save you being in the situation you are in now.

 

[telectrix]

bet it's a shared neutral between 2 lighting circuits or a N in wrong bar in CU.

 

[Zebra Stripe]

bet it requires a bit of simple logical thinking and some know how and possibly a dash of electrician

 

[Davem]

No borrowed neutral all lighting is segregated to individual circuits Everything works fine other than under unit lights

 

[onions1066]

Where are the under unit lights switched from? I had a similar problem once . They picked the live from the kitchen switch and a neutral from a kitchen socket.

 

[Marvo]

Did you IR test the lighting?

 

[Zebra Stripe]

Can you do a diagram of how youve wired them? if not I'd have to come round and have a look at £30 per hour......sorry but nothing like this ever happenes to me cos Im perfect.

 

[GMES]

This is exactly the reason why pre-testing is so important and should be as important a job as making sure the kettle is boiled before you kill the power. test test and test again

 

[SPARTYKUS]

Let us know what the fault is.

I will be nice, all I ask of you is that you do not take offence to any comments! Take it as tea break banter,

and you will be a winner

 

[telectrix]

No borrowed neutral all lighting is segregated to individual circuits Everything works fine other than under unit lights

it's possible that the L feed to these under cupboard lights comes from another circuit. rather a borrowed L than a borrowed N.

 

[onions1066]

it's possible that the L feed to these under cupboard lights comes from another circuit. rather a borrowed L than a borrowed N.

Tel that's post stealing at its finest :30:

 

[Zebra Stripe]

jesus, hunt the mistake with nothing to go on but jiberish..gooodluck to all that sail in her

 

[R G]

Tenner says its a borrowed neutral , you say that there is a link at the 2 gang kitchen switch , as already mentioned the neutral has got to be from another circuit fed from the other RCD, most likely the kitchen sockets .

 

[GMES]

Tel that's post stealing at its finest :30:

it's possible that the L feed to these under cupboard lights comes from another circuit. rather a borrowed L than a borrowed N.

Where are the under unit lights switched from? I had a similar problem once . They picked the live from the kitchen switch and a neutral from a kitchen socket.

There is an uncanny resemblance to these posts :cheesy:

 

[Davem]

it's possible that the L feed to these under cupboard lights comes from another circuit. rather a borrowed L than a borrowed N.

This maybe true mate mate link from main kitchen common to under hint common

 

[Davem]

Tenner says its a borrowed neutral , you say that there is a link at the 2 gang kitchen switch , as already mentioned the neutral has got to be from another circuit fed from the other RCD, most likely the kitchen sockets .

Sounds good to me mate I will check and test tomorrow mate appreciate guys

 

[SPARTYKUS]

Im with Ray Galea

 

[longboat]

This is exactly the reason why pre-testing is so important and should be as important a job as making sure the kettle is boiled before you kill the power. test test and test again

And a pan full of water on the hob..... just in case

 

[GMES]

And a pan full of water on the hob..... just in case

thinking even further in front / I like it
But make sure you have a lighter or matches in case it is an electric ignitor

 

[mayfair]

Good advice then you will see your spelling mistakes

Hey little bit of advise, type your post up in word, then go away for 10 mins or so, then come back and read it, edit it then post it.

 

[HandySparks]

Where are the under unit lights switched from? I had a similar problem once . They picked the live from the kitchen switch and a neutral from a kitchen socket.

Here's exactly this situation I found a couple of years ago. Neutral borrowed from the oven circuit:
Andrew Neish, Electrician and Handyman

Pics 3 and 4.

 

[Zebra Stripe]

But little fella, you understood the communication, and thats the point......communication..not spelling, ask Einstein (copy and paste just for you)

 

[R G]

Nice film on over christmas called the borrowers , just don't let em loose on the wiring!!

 

[longboat]

thinking even further in front / I like it
But make sure you have a lighter or matches in case it is an electric ignitor

Yeah most of my regular customers bring me a fresh brew every hour or so.
The one's that are out all day say "help yourself to tea and buscuits" and buy in extra tea bags.

 

[Octopus]

Evening gents bit of advice required please I have recently finished a partial rewire (upstairs sockets upstairs lights and smokes). All is fine apart from when I turned under unit lights on in kitchen it tripped both rcds. There is 1 2 gang switch in kitchen 1 for main kitchen light and 1 for under unit I have taken link out from main light switch the under unit light switch and this rectified the problem no tripping but when I put link back in both tripped again and ideas guys cheers by the way pretty new to the game so be nice 

I'm curious how you located this. That said you say it stopped the tripping, but what isn't working now?

 

[Davem]

I'm curious how you located this. That said you say it stopped the tripping, but what isn't working now?

Under unit lights mate no live feed to them because I took link out

 

[Davem]

Morning gents had a look and there is a borrowed neutral from socket in kitchen also IR reading for neutral to earth is reading at 154 M ohms could this be due to the borrowed neutral ?? Thanks for advice as we'll guys cheers

 

[Richard Burns]

So the supply for your undercupboard lights should be fused down from the sockets and the line from the fused down sockets goes to the switch for the undercupboard lights and you are sorted.
Alternatively get a neutral from the kitchen lights to supply the undercupboard lights and leave the switch as it is.
154Mohm is fine.

 

[Davem]

So the supply for your undercupboard lights should be fused down from the sockets and the line from the fused down sockets goes to the switch for the undercupboard lights and you are sorted.
Alternatively get a neutral from the kitchen lights to supply the undercupboard lights and leave the switch as it is.
154Mohm is fine.

Spot on cheers mate appreciate response