SuperlecDirect - ElectriciansForums.net Electrical Suppliers
This official sponsor may provide discounts for members
Advertisement - Content continues below
Advertisement - Content continues below

Discuss RCBO's on to old wiring....HELP!!! in the Industrial Electrician Talk area at ElectriciansForums.net

S

sliver

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

I seem to be having alot of trouble after installing anew consumer unit with 5 RCBO's I have got really high milli second readings and dont understand why I am looking at 350 x 1 and no operation on x 5. IR is fine and so is R1 + R2. Any suggestions????:confused:
 
CK Tools :) The professionals choice when it comes to Electrical Tools
This official sponsor may provide discounts for members
Advertisement - Content continues below
M

Mike P

  • Thread Starter Thread Starter
  • #2
Check the size of your main MET and check your Ze if the main MET is to small or poor connection this will give you those sort of problems.
 
S

sliver

  • Thread Starter Thread Starter
  • #3
thanks for the reply mike. i've a rod which is installed beneath the lounge floor and am getting a reading of 56ohms .i've the possiblity of pme which will bring it down to 0.35,but am concerned that there may be a borrowed neutral on one of the old circuits,will this be a factor to effect newly installed circuits??
 
S

shedfull

  • Thread Starter Thread Starter
  • #4
Borrowed neutral's usually take an RCD out as soon as you power up, have you tried swapping the Rcbo's around ( where the amps are the same ) to see if it's a duff rcbo?

Lee
 
S

sliver

  • Thread Starter Thread Starter
  • #5
thanks lee,i've got a problem that when the bathroom lighting is energised the rcbo trips out,so i think that is where the neutrel problem lies,but yes i,ve swaped ,and also installed other rcbo's to double check readings from the original onesand they come up with the same reading.thanks for the input the more views i can get on this the easier to solve for me
 
M

Mike P

  • Thread Starter Thread Starter
  • #6
It probably is borrowed neutral. Some people have a habit of nicking the neutral from a shower feed to feed a light over the shower. If you have the choice of type of supply go for pme.
 
S

sliver

  • Thread Starter Thread Starter
  • #7
Cheers Mike will be looking at it monday will let you know how i get on!!!
 

old dog

-
Arms
It probably is borrowed neutral. Some people have a habit of nicking the neutral from a shower feed to feed a light over the shower. If you have the choice of type of supply go for pme.
hi do you have up and down stairs lighting this seems to be the most likely
place to find borrowed neutral
 
Test Meter - Forum Sponsors since 2007!
This official sponsor may provide discounts for members
Advertisement - Content continues below

Reply to RCBO's on to old wiring....HELP!!! in the Industrial Electrician Talk area at ElectriciansForums.net

Aico 3000 Range
This official sponsor may provide discounts for members
Advertisement - Content continues below
Top Bottom