150m submain to multiple outbuildings earthing (PME)

[sparkydaryl]

This is not really something I have ever had to deal with. Always done commercial submains which have been tns. But as an electrician are we allowed to just change the earthing system as it suits us? I thought that kind of thing was down to dno.

 

[westward10]

This is not really something I have ever had to deal with. Always done commercial submains which have been tns. But as an electrician are we allowed to just change the earthing system as it suits us? I thought that kind of thing was down to dno.

The same would apply with TN-S the armour must be suitably sized. To overcome the problem of armour inadequacies you can create a TT earthing system.

 

[Wilko]

I think it's the owner's choice whether to use DNO means of earthing (if they've provided one) or not. Normal to use DNO means of earthing for the first building of the installation, but may be different answer if it's a larger site with multiple small outbuildings that also need bonding.

 

[Midwest]

"Normally not" would not mean that you could not as long as it is correctly sized.

Too many 'not's' in there for me to make sense of it