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Discuss Earth Rod on TN-CS in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

M

markthespark

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Hi ive been working at a place where a guy has been out to test the installation and found some problems i was sent to rectfy these.

On one part fo the installation, he mentioned that the main earth was a TN-CS system but didnt comply because there was an earth rod also installed.

Whats wrong with having an earth rod installed on a TN-CS system is it something to do with different potenials?

Ive asked a couple of people and knowone knows the correct answer.

Any ideas chaps?

Cheers
 
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T

TonyM58

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  • #2
Mark

read the defintion of a TN-C-S system in Part 2 Defeneitions in BS7671:2001, in particular the diagram for a TN-C-S

the write up underneath specifically says that an earth rod may be required at the consumers installation (or words close to that, aint got the regs in front of me)
 
M

markthespark

  • Thread Starter Thread Starter
  • #3
Cheers mate ill have a look tommorow.
 
A

alan

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  • #4
TN-C-S is called a PME or protective multiple earthing .
Regular joints are earthed out via rods in the ground. In case the combined neutral earth open-circuit. This happens more often than you would think.
So any reading Ze higher than 0.35 has to be reported, because the Zs is compromised.
 
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