TN system

[Virtualcom13at]

Question=What is the minimum size of main equipotential bonding conductor on an TN system?

Again i have been looking in all the books and on google and must keep missing it. :angry_smile:

the options i have are 10mm2, 1,0mm2, 25mm2, 2.5mm2.

 

[Paul.M]

Again the C&G question does not give enough info. Is the TN system in a factory or a home? If we say for argument sake its in a house supplied at 230V then 10mm.

 

[Virtualcom13at]

Yeah again its word for word as it reads in the TMA. Guessing im going to get this thoughout my TMAs then.
I do think it is ment for domestic propertys.
Cheers mate.

 

[Paul.M]

What books do you have so we can tell you what sections and tables to look at? Hopefully osg/brb at least. Good way of learning and discussing on here what you don't understand.

 

[IQ Electrical]

544.1.1 CSA not less than half CSA required for the earthing conductor and in any event, not less than 6.0mm.Regardless of any other conditions, if made of copper, the CSA need not exceed 25mm.