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Topic Title: Which Type of Earthing?
Topic Summary: TN-S or TNC-S
Created On: 04 February 2013 05:50 PM
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 04 February 2013 05:50 PM
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Igot3ears

Posts: 364
Joined: 24 December 2004

Hi all

Went to look at a job today in a 2-bedroom flat. A 16mm earthwire comes from the consumer-unit to the earthing connection of the supplier's cut-out (normally TNC-S). Another 16mm earthwire comes from the same terminal and goes to a clamp on the lead sheath of the incoming cable with a "safety electrical earth - do not remove" label (so normally TN-S).

What type of earthing would I put on the certificate? Assuming I get the job of course!

Regards

3ears
 04 February 2013 06:15 PM
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ennisteve

Posts: 10
Joined: 10 December 2012

TNCS- the lead earth is probably been deemed not good enough earth and so the electricity company has made a PME connection and bonded the sheath to prevent a potential existing between them.
 04 February 2013 06:23 PM
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daveparry1

Posts: 6378
Joined: 04 July 2007

Be careful though as sometimes that earth terminal block on the cut-out isn't connected to the neutral inside! To test, turn off the main switch, disconnect the earthing cable from that terminal and then measure for continuity from there to the neutral tail,

Dave.
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