3 wires come into the building.from the outside, and so I would have said TN-S overhead or TT split phases  but mostly  I think TNS.

Though maybe not clear as it looks like either something odd has been done with the earths and neutral at the cut-out, or more likely  that all 3 wires LNE duck down behind the board to supply another cut-out on the other side of the wall as a loop through supply.

Hopefully there is not an un-needed NE link or an NE transposition, unless this is an odd way of implementing a double fault to failure on TNS upgraded to  PEN.


Now the pole will be L1/L2/L3/N /E and presumably the 'spare' is a street lighting timed live, so that supports a TN-S assuming it has not been retrospectively PME'd.

3 wires come into the building.from the outside, and so I would have said TN-S overhead or TT split phases  but mostly  I think TNS.

Though maybe not clear as it looks like either something odd has been done with the earths and neutral at the cut-out, or more likely  that all 3 wires LNE duck down behind the board to supply another cut-out on the other side of the wall as a loop through supply.

Hopefully there is not an un-needed NE link or an NE transposition, unless this is an odd way of implementing a double fault to failure on TNS upgraded to  PEN.


Now the pole will be L1/L2/L3/N /E and presumably the 'spare' is a street lighting timed live, so that supports a TN-S assuming it has not been retrospectively PME'd.