Fuseboards

[rob69]

I am in the process of a job (first time) to convert from one fuseboard to two fuseboards due to physical constraints. Each fuseboard has its own RCD . Each fuseboard is supplied from same meter tails and linked from one to the other. I am finding that when I test the circuits on one fuseboard, the RCD on the opposite fuseboard is occasionally tripping too??? I understand that the two RCD's are in parallel but not sure how to correct this. PLEASE only reply if you are going to help thanks.

 

[Pete999]

What tests are you trying to carry out? what test instrument are you using?

 

[telectrix]

try switching one board off while testing the other, and vice versa.

 

[Octopus]

You need to post a picture to show the set up as your description isn't totally clear.

What you are correct about is not having 2 RCD's in series.

And why are you doing this?

 

[Silly Sausage]

I am in the process of a job (first time) to convert from one fuseboard to two fuseboards due to physical constraints. Each fuseboard has its own RCD .

Each fuseboard is supplied from same meter tails and linked from one to the other.
Implies the boards are in series.

I am finding that when I test the circuits on one fuseboard, the RCD on the opposite fuseboard is occasionally tripping too???

I understand that the two RCD's are in parallel
Now says they're in parallel.

but not sure how to correct this. PLEASE only reply if you are going to help thanks.

Pointless continuing without further input!!!

 

[Pete999]

Agreed

 

[Octopus]

So in 2009 you set up your domestic business and its now 4 years later....... surely this is a walk in the park

 

[HandySparks]

So what IR testing did you do before installing these new 'fuseboards' and what testing did you do to ensure that there was no interconnection between the circuits on one board and the circuits on the other?

 

[Andy78]

Don't think he is coming back to us on this one.

 

[Pete999]

I wonder why?

 

[Octopus]

I am in the process of a job (first time) to convert from one fuseboard to two fuseboards due to physical constraints. Each fuseboard has its own RCD . Each fuseboard is supplied from same meter tails and linked from one to the other. I am finding that when I test the circuits on one fuseboard, the RCD on the opposite fuseboard is occasionally tripping too??? I understand that the two RCD's are in parallel but not sure how to correct this. PLEASE only reply if you are going to help thanks.

Can we say we'll only respond IF YOU provide us with a sensible description of what you've done, tested and a photo or 2 - otherwise you will get heaps of flack from all over the place

 

[Richard Burns]

This is a diagram of various possibilities that may help you to identify how you have wired the two CUs.
From what you describe the RCDs are in series so you need to ensure that each RCD is supplied from the main supply and not from after another RCD.

 

[rob69]

Sorry all been busy with family stuff.
I have connected them up as per Richard Burns right hand diagram.
Also, the series / parallel issue is confusing as the RCD's are across R1 and RN although but in series in one of the diagrams above.
So, looking at that diagram (and following the circuit with both RCD's and main switches on)both RCD's are across R1 and RN so either could trip during testing as one could be more sensitive than the other???
Does anybody else see that??

 

[rob69]

SORRY, should of read......
So, looking at that diagram on the right (and following the circuit with both RCD's and main switches on)both RCD's are across R1 and RN so either could trip during testing as one could be more sensitive than the other???
Does anybody else see that??

 

[Octopus]

SORRY, should of read......
So, looking at that diagram on the right (and following the circuit with both RCD's and main switches on)both RCD's are across R1 and RN so either could trip during testing as one could be more sensitive than the other???
Does anybody else see that??

Not at all - if you follow the right hand drawing the RCD's WON'T affect each other.

So what tests have you done and why are you doing this work?