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Topic Title: TN-C-S / TN-S
Topic Summary: Confusion
Created On: 28 September 2017 04:28 PM
Status: Read Only
Linear : Threading : Single : Branch
 TN-C-S / TN-S   - MikeLuker - 28 September 2017 04:28 PM  
 TN-C-S / TN-S   - weirdbeard - 28 September 2017 05:25 PM  
 TN-C-S / TN-S   - leckie - 28 September 2017 05:26 PM  
 TN-C-S / TN-S   - MikeLuker - 28 September 2017 05:45 PM  
 TN-C-S / TN-S   - MikeLuker - 28 September 2017 06:17 PM  
 TN-C-S / TN-S   - AJJewsbury - 28 September 2017 06:29 PM  
 TN-C-S / TN-S   - MikeLuker - 28 September 2017 06:43 PM  
 TN-C-S / TN-S   - AJJewsbury - 28 September 2017 08:00 PM  
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 28 September 2017 04:28 PM
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MikeLuker

Posts: 21
Joined: 01 February 2017

Hi All,

Today we have a previously certified TN-S Main Switch Panel with 300mm single line conductors 3 phase and a seperate bare earth conductor. Test readings show as TN-C-S as tested line conductors to earth and neutral, very much the same reading. Opened up the bottom of the panel and the DNO have a 35mm black single cable link to the earth bar, so effectivly changing this to a TN-C-S arrangement via a small link cable lowering the incoming impedance. Would TN-S bonding conditions apply as this is not PME. Is the link cable a DNO neutral reference to earth, is this correct with such a small cable on a 300mm supply or would this not effect any neutral currents, would this still be certified as TN-S with a note that a reference link has been installed thus creating TN-C-S low impedance readings, very confused by this one at the moment and any good advice would be appreciated.

Regards Mike
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