RCD Problem - HELP NEEDED!

[arry01]

First off I dont claim to be great with electrics!

I have installed a new consumer unit today, from the meter it has some 16mm T&E tails at considerable length - maybe 10 meters where I have put a KMF switch with an 80amp fuse.

The board is a 2 way split, when i open the main RCD switch at 100amp to the CU that sits open, when I open the 2 x 63amp RCD's one snaps back in a fault condition whilst under no load at all. The other sits comfortable operating some lights.

Assumed it must be a faulty RCD i thought i would swap them, same problem.

I cant work out what is going on here and would appreciate some help, has anyone seen this before please?

Many thanks in advance.

Harry

 

[gnselectricals]

Seen it loads of times, best to get a qualified sparky with suitable test gear to find the fault/s you obviously have.

 

[davesparks]

If circuits are live with the main RCD open then you have a very serious problem.

Why do you have an RCD main switch? Is it a TT?

 

[Hellmooth]

Don't claim to be great with electrics but you've attempted to install that lol?

 

[davesparks]

Don't claim to be great with electrics but you've attempted to install that lol?

Yeah, what's the worst that could happen?
It's not like electricity can kill a person in a fraction of a second is it?

 

[Leesparkykent]

Jeez!!

 

[Marvo]

First off I dont claim to be great with electrics!

Are you working in your own home or at a customer. If you're working for a customer you're required to be 'competent' and saying you're not great with electrics is making me wonder.:shocked:

I have installed a new consumer unit today, from the meter it has some 16mm T&E tails at considerable length - maybe 10 meters where I have put a KMF switch with an 80amp fuse.

The board is a 2 way split, when i open the main RCD switch at 100amp to the CU that sits open, when I open the 2 x 63amp RCD's one snaps back in a fault condition whilst under no load at all. The other sits comfortable operating some lights.

Assumed it must be a faulty RCD i thought i would swap them, same problem.

I cant work out what is going on here and would appreciate some help, has anyone seen this before please?

Did you test the circuits for insulation faults or crossed/borrowed neutrals before you installed the CU? If so what were the results?

 

[Leesparkykent]

It's notifiable work....

 

[Simonslimline]

First off I dont claim to be great with electrics!

I have installed a new consumer unit today, from the meter it has some 16mm T&E tails at considerable length - maybe 10 meters where I have put a KMF switch with an 80amp fuse.

The board is a 2 way split, when i open the main RCD switch at 100amp to the CU that sits open, when I open the 2 x 63amp RCD's one snaps back in a fault condition whilst under no load at all. The other sits comfortable operating some lights.

Assumed it must be a faulty RCD i thought i would swap them, same problem.

I cant work out what is going on here and would appreciate some help, has anyone seen this before please?

Many thanks in advance.

Harry

:juggle:

 

[telectrix]

I'm saying nowt for fear of a ban. where's glennsparks when you want him?

 

[Leesparkykent]

Thread should be closed IMO

 

[Marvo]

Yeah, I'm waiting for some further info from Harry first.

 

[Simonslimline]

First off I dont claim to be great with electrics!

I have installed a new consumer unit today, from the meter it has some 16mm T&E tails at considerable length - maybe 10 meters where I have put a KMF switch with an 80amp fuse.

The board is a 2 way split, when i open the main RCD switch at 100amp to the CU that sits open, when I open the 2 x 63amp RCD's one snaps back in a fault condition whilst under no load at all. The other sits comfortable operating some lights.

Assumed it must be a faulty RCD i thought i would swap them, same problem.

I cant work out what is going on here and would appreciate some help, has anyone seen this before please?

Many thanks in advance.

Harry

I believe its called not being competent!

Maybe best to call a local electrician to take a look.

 

[telectrix]

Harry Worth?

https://www.youtube.com/watch?v=f189hOfyYSY

 

[Octopus]

Popcorn at the ready

 

[telectrix]

Popcorn at the ready

need more than popcorn for this one. a large single malt might do,

 

[Marvo]

Okay the OP hasn't returned with answers to questions so I'm closing this. Arry01, you're welcome to PM me and state your case with more info if you want the thread reopening.

 

[Paul.M]

Popcorn at the ready

"Close Thread" button at the ready.

@ arry01. Please tell us that you have half a clue what you are doing? This is just a matter of your customers safety and your own!

 

[Paul.M]

Marvo 1 -0

ps I'm also welcome to any PM's from the OP.

 

[Paul.M]

After receiving a PM from the OP explaining a few more things, I'll be nice......


You have what is called a "borrowed/shared neutral". First point of call is to conduct a continuity test in between the neutral bars. Close attention should be given to the lighting circuits and the possibility of crossed over legs of RFC's.

With the Quals you have + your test equipment. You should figure this out in no time.



Thread re-opened