- Reaction score
- 17,085
There is no Regulation requiring out buildings to be TT.
The main reason for considering making an out building TT is simply cost.
Is it cheaper to run a 10mm bonding conductor from the house MET to the out building, or to install an earth rod at the out building?
For an installation with 10mm bonding then I doubt there is much cost difference.
However if the installation needs 50mm bonding and an outbuilding is to have a 32A submain the TT option may be considerably cheaper