CK Tools :) The professionals choice when it comes to Electrical Tools
This official sponsor may provide discounts for members

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

M

markthespark

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

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
 
SuperlecDirect - ElectriciansForums.net Electrical Suppliers
This official sponsor may provide discounts for members
T

TonyM58

  • Thread Starter Thread Starter
  • #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

  • Thread Starter Thread Starter
  • #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.
 
Instyle LED Lighting Specialists UK
This official sponsor may provide discounts for members

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

Top Bottom