Test Meter - Forum Sponsors since 2007!
This official sponsor may provide discounts for members

Discuss Neutral CPC short circuited in PME system, is that correct? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

M

mikex79

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

HI
Doing a test with a voltage detector/continuity tester on live PME/TN-C-S system installation at a socket outlet either with load and without the load shows voltage between live and neutral and live and earth but live-earth seems to be short circuited and the continuity tester indicates continuity which for me means thet they are short circuited (and I recon they are short circuited ot the orgin as the system gets only one PEN conductorfrom the supplyer which acts as a neutral and CPC at the same time) but the probelem is that even if I switch off the MCB which seems to be very old type like from 20-30 years ago nothinch changes and the continuity between earth and neutral still exist. my question is if it is cused becouse the mcb may not be a double pole switch? if it safe (all appliances connected to the sockets work propelly but the question is if they are safe)? what test should i do on top of what i have dont to make sure all of above?
many thanks
 
Last edited by a moderator:
Instyle LED Lighting Specialists UK
This official sponsor may provide discounts for members
S

Spudnik

  • Thread Starter Thread Starter
  • #2
You need to ensure main switch is off before carrying out any of the tests you describe.

You could try an IR test between all conductors and it should read clear, with the main switch off, all mcb's off.
 

old dog

-
Arms
You need to ensure main switch is off before carrying out any of the tests you describe.

You could try an IR test between all conductors and it should read clear, with the main switch off, all mcb's off.
disconnect neutral from the cu or both neutral and cpc you will find it will clear
if not you have a problem
 
S

Spudnik

  • Thread Starter Thread Starter
  • #4
disconnect neutral from the cu or both neutral and cpc you will find it will clear
if not you have a problem
No need to disconnect the neutral if the main switch is off:confused:

Or do you mean disconnect each circuit neutral and cpc to test?
 
M

mikex79

  • Thread Starter Thread Starter
  • #5
You need to ensure main switch is off before carrying out any of the tests you describe.

You could try an IR test between all conductors and it should read clear, with the main switch off, all mcb's off.

shall I disconnect the CPC and neutral conductors before I do an insulation test?

You need to ensure main switch is off before carrying out any of the tests you describe.

You could try an IR test between all conductors and it should read clear, with the main switch off, all mcb's off.

shall I disconnect the CPC and neutral conductors from the cosumer unit before I do an insulation test?
 
Last edited by a moderator:

old dog

-
Arms
No need to disconnect the neutral if the main switch is off:confused:

Or do you mean disconnect each circuit neutral and cpc to test?
i dont normally isolate the whole board to test one circuit thats why i just focust on the circuit in question
 
Electrical2Go - Online Electrical Supplier
This official sponsor may provide discounts for members

Reply to Neutral CPC short circuited in PME system, is that correct? in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

SuperlecDirect - ElectriciansForums.net Electrical Suppliers
This official sponsor may provide discounts for members
Top Bottom