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Topic Title: earth loop test on a fault circuit
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Created On: 01 November 2013 08:38 PM
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 01 November 2013 08:38 PM
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jren

Posts: 4
Joined: 01 November 2013

Hi
New to the forum but have an unusual situation (well unusual to me)

I was called to a property where the customer said a socket was not working.

I tested the socket, took an eli. Socket working... (must have been the toaster )

CU was 17th edition so as a matter of course did an rcd test, nothing..
Went back to CU realised someone had replaced the rcd with a main switch; hence why rcd test failed.

Advised customer could either refit an rcd or could provide rcbos.
Cust agreed. On revisit reason for change to main switch becomes apparent. Neutral earth fault on sockets earths pulled out of board.

(Fault- neutral has dropped out of socket in bedroom and is touching the metal box) Some sc...bag has fixed the problem for her alright pulling earths out.and taking rcd out.

Anyway to get the point; How did I get an ELI at the kitchen socket on the previous visit.

a) parallel paths - earth has been picked up elsewhere and carried back to the board.
b) Wandering neutral onto another circuit and thereby earthed on this path
c) The neutral that has dropped out of the socket onto the back box has meant i have not taken an eli but the earth has travelled back up the neutral/earth fault and in essence done a l-n fault loop not a l-e loop.

Ps tester is 3 lead metrel??

Any ideas ??
All or any of the above??
 01 November 2013 08:52 PM
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ady1

Posts: 766
Joined: 19 April 2005

Hi mate
A simple R1 R2 and a mega will answer that ?
Compare your EL with your R1 R2 added to your Ze.
Probably A

Regards
Ady

-------------------------
Resistance is futile.
 01 November 2013 09:12 PM
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jren

Posts: 4
Joined: 01 November 2013

Cheers
I was leaning more to C
simply because now the fault is rectified I cant recreate the original r1 r2 even with the earths pulled.

Whereas with a n/e fault the tester shouldn't have been able to do an eli. Hence the poss of a l-n

The r1 r2 now wouldn't be comparable with the one done when the fault was one the board, hence why I was trying to work back

Thanks though
 01 November 2013 09:16 PM
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jren

Posts: 4
Joined: 01 November 2013

Have since been able to get an eli reading with the tester on n/e fault i.e. picking up the n/e fault back to board
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