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Discuss TNCS CPC not used in the Electrical Forum area at ElectriciansForums.net

There is nothing to stop anyone adding earth rods to a TNCS system. Amendment 2 mentions this.
The real questions are probably:
-is it TNCS system?
-does the earth rod have a specialist purpose that needs to be understood?
Feel free to stick some photos up.
(Obviously, measuring what you think is the external loop impedance from the supplier, as well as the L-N loop impedance would help.)
 
Sausages (just for tracking a min lol needed a word, I must be hungry)
They could have got there by many different means: it could have been TT and DNO now converted to TN-C-S, or it could still be TT if there was reason(s) to want to avoid the supplier's earth (for example, it feeds extensive outdoor metalwork, areas where PME is prohibited, etc).

As @timhoward says there is no harm, and often a small advantage, in adding rods to the supply earth, so if it simply is that situation then nothing really needs changing.
 
What type of installation is it? In certain circumstances such as temporary supplies to building sites the DNO can put in a TNCS supply but with hold the earth connection so that the site has to TT it.
 
Sausages (just for tracking a min lol needed a word, I must be hungry)

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