- Reaction score
- 85
In a commercial building that is owned by a landlord and then each office area has its own water supply and distribution board.
The sub-main comes from a panel from the main installation in the basement so the sub-main is a TN-S but main incomer is usually a TNCS.
When form filling you are asked what type of supply at the origin, I take it this means the main incomer where it enters the building, when asked for the Ze, what do you put in? is it a limitation as you cant turn the supply off to disconnect the earth.
As for the bonding, are they enquiring as to the bonding for the main building or your particular zone?
The sub-main comes from a panel from the main installation in the basement so the sub-main is a TN-S but main incomer is usually a TNCS.
When form filling you are asked what type of supply at the origin, I take it this means the main incomer where it enters the building, when asked for the Ze, what do you put in? is it a limitation as you cant turn the supply off to disconnect the earth.
As for the bonding, are they enquiring as to the bonding for the main building or your particular zone?