T
the-moog
Advice on this installation please.
The existing house wiring is single phase to an internal consumer unit, with incomming 3 phase on PME in an external box which also contains the isolator which is 4 pole.
i.e.
Incomming (3Ph) - Main Fuse (3Ph PME) - meter (3Ph) - isolator (4 pole 3Ph) - tails - CU (1Ph)
This external 4 pole isolator is to be connected to the garage which requires 3 phase. In the garage there is a new distribution board. As well as a mix of single and three phase equipment, the garage also supplies external lighting pond pumps etc on single phase with the required RCDs.
So, question 1 is; should the isolator on the garage dist board be 3 pole or 4 pole, remembering that the systems is PME?
Logic tells me 3 pole so equipment metalwork still has earth continuity when the main isolator is on and the garage isolator is off.
Question 2 is; should the garage have an earth rod?
The existing house wiring is single phase to an internal consumer unit, with incomming 3 phase on PME in an external box which also contains the isolator which is 4 pole.
i.e.
Incomming (3Ph) - Main Fuse (3Ph PME) - meter (3Ph) - isolator (4 pole 3Ph) - tails - CU (1Ph)
This external 4 pole isolator is to be connected to the garage which requires 3 phase. In the garage there is a new distribution board. As well as a mix of single and three phase equipment, the garage also supplies external lighting pond pumps etc on single phase with the required RCDs.
So, question 1 is; should the isolator on the garage dist board be 3 pole or 4 pole, remembering that the systems is PME?
Logic tells me 3 pole so equipment metalwork still has earth continuity when the main isolator is on and the garage isolator is off.
Question 2 is; should the garage have an earth rod?
