TN-S or TN-C-S

[Engineer54]

mmmmm so you look at your main incoming cable/cables in your main switch and the neutral is bolted/connected directly onto earth as has been stated is sometimes done............how would you say that is TN-S?

A N-E link at the main switchboard won't be at the main switch, but between the earth and neutral switchboard bus bars. The link will also normally be a removable bus bar link.... It won't necessarily be in the same compartment as the main incoming switch either, but in a cabling compartment!!

 

[Norwich]

see engineer54's comments above, I would agree, we see it often always TNS on reports and backed by NICEIC on annual inspection last year

 

[Engineer54]

see engineer54's comments above, I would agree, we see it often always TNS on reports and backed by NICEIC on annual inspection last year

Well that's not much of a back-up then!! lol!!

 

[44ALLAN]

A N-E link at the main switchboard won't be at the main switch, but between the earth and neutral switchboard bus bars. The link will also normally be a removable bus bar link.... It won't necessarily be in the same compartment as the main incoming switch either, but in a cabling compartment!!

Ahhhh right..........was having trouble visualizing that.
Good explanation thanks.

 

[44ALLAN]

see engineer54's comments above, I would agree, we see it often always TNS on reports and backed by NICEIC on annual inspection last year

Yup I think I can see it now.............I'll digest the info better tomorrow morning after a lie in lol

 

[snowhead]

To the O.P,
Ask the TNC-S believers to explain what a TNS set up would look like on your site.

 

[Knobhead]