Borrowed Neutral / Board Change

[m4tty]

Hi,

Whats the best way to check for a borrowed neutral on a board change before you start??

Thanks

 

[monkey5]

Hi,Whats the best way to check for a borrowed neutral on a board change before you start??

Thanks

good question. i would aslo like to know...

 

[Andy™]

isolate circuit A. turn on all lights on circuit B and note what is on and what isnt. isolate board and remove neutral from DB for circuit A. power back on. if this neutral is now live, or a light on circuit B doesnt work, then borrowed neutral.

if alls good, do opposite

i never check any of thise before a CU change

 

[bulmer]

Just an idea, but couldn't you not disconnect each of the neutrals at the CU, then check for continuity between up and down neutrals?

 

[Zeespark]

Just do a seperation of circuits test at the CU. That will find out if you have a shared neutral and on what circuits.

AndyGuinness

 

[Evans Electric]

Yes , could do that. The link will almost always be on the landing/ top of stairs light.

 

[Zeespark]

I dont doubt that Evan but it does prove to the client that there is a shared neutral there before you start work at least

AndyGuinness

 

[Jacko29]

Hi,Whats the best way to check for a borrowed neutral on a board change before you start??

Thanks

This may be off help, but I always check the 2 ways visually and if you see single cable connections at both switches (instead of two cables from one), probably crossed neutrals,

Sometimes see a loop circuit if its a double switch with 2 way etc.

Also find that one of the lights (usually upstairs hallway etc) will work of the downstairs radial.

Hope that makes sense