Hi
I recently had a PV system we installed switched off after the Electrical Contractor got a shock off the Neutral. He was wiring lighting but after a processes of elimination found the fault was on our PV circuit.
We did dead tests on the circuit
Insulation resistance (1000v)
Continuity
Polarity
But no faults came up. He would not let us re connect it until the fault was found. Now the question:
He would let us connect the live but not the neutral (in case it livens up all the neutrals and earths in the school), so live and earth was connected to their DB). We disconnected the PV system so we just had a 20m 3 core flex from plant room to roof. When the live was connected to he live DB we would get 104v across neutral (not connected to DB and earth (connected to the DB)
When the micro-inverters were connected we would get 240v across earth to neutral.
When we finally connected the neutral to the DB the voltage between earth and neutral dropped to 1v.
Anyone shed any light on this? Happy to give more info if it's not clear but it's a long post already.
Thanks people
I recently had a PV system we installed switched off after the Electrical Contractor got a shock off the Neutral. He was wiring lighting but after a processes of elimination found the fault was on our PV circuit.
We did dead tests on the circuit
Insulation resistance (1000v)
Continuity
Polarity
But no faults came up. He would not let us re connect it until the fault was found. Now the question:
He would let us connect the live but not the neutral (in case it livens up all the neutrals and earths in the school), so live and earth was connected to their DB). We disconnected the PV system so we just had a 20m 3 core flex from plant room to roof. When the live was connected to he live DB we would get 104v across neutral (not connected to DB and earth (connected to the DB)
When the micro-inverters were connected we would get 240v across earth to neutral.
When we finally connected the neutral to the DB the voltage between earth and neutral dropped to 1v.
Anyone shed any light on this? Happy to give more info if it's not clear but it's a long post already.
Thanks people