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While I have not yet done anything that requires me to know my supply type, It would be good to know for the future... I had always thought it to be TN-CS because the earth connection is made on the supply head rather than the protective sheathing of the supply cable. However, the supply cable has three wires within the sheathing... Live (red), Neutral (black) and Earth (uninsulated but not part of sheathing)... So it is TN-S afterall right?
This cable comes from a metal box outside the property to which my neigbour's house is also connected (I assume this box is like a 'service junction box' of some sort, I believe it has three phase coming into it because power cuts have frequently occured where I am affected and my neigbours are not/vice versa).
The earth supply at one point must have been TT... there is a rather antiquated earth rod in the back yard... The supply we now have was installed in 1983.
I know I'm probably being stupid here, but it's just not how they picture it in the diagrams...
This cable comes from a metal box outside the property to which my neigbour's house is also connected (I assume this box is like a 'service junction box' of some sort, I believe it has three phase coming into it because power cuts have frequently occured where I am affected and my neigbours are not/vice versa).
The earth supply at one point must have been TT... there is a rather antiquated earth rod in the back yard... The supply we now have was installed in 1983.
I know I'm probably being stupid here, but it's just not how they picture it in the diagrams...
