TN-S vv TN-C-S

[xraytek]

Both have disadvantages TN-S for instance - if the sheathing of the cable breaks down this could go un-noticed for years as the bonding conductors would be providing a paralell path to earth. You would know straight away if a TN-C-S conductor was lost.

But the bonding conductors would provide a parallel path for a TN-C-S supply too.
In fact it could be argued that its even more dangerous to loose the PEN conductor of a PME, because the neutral will take a path from the earth connection at the service head and through bonded extraneous parts.

 

[Guest123]

its even more dangerous to loose the PEN conductor of a PME

Thats what I mean, you would notice it straight away.

 

[Spudnik]

Indeed, and now the DNO's are trying to do away with PME and go back to TNS!

I wish they would make up their minds