Testing a split load CU today that another Electrician had fitted. It was in a very small office. There is one ring with 6 sockets & 2 lighting circuits (1 for the kitchen & toilet & 1 for the main room)
All CU switches were off & the circuits were connected in the CU, but when I measured from supply Live to load Neutral on the main switch I got 139Volts
When I measured on the supply Live to the Neutral bar on the RCD side with the RCD on I got 113Volts.
If I removed 1 circuit at a time from the CU the voltage dropped until all circuits were removed & the voltage was zero.
Load live to load Neutral 0v
What do you think is going on here ?
All CU switches were off & the circuits were connected in the CU, but when I measured from supply Live to load Neutral on the main switch I got 139Volts
When I measured on the supply Live to the Neutral bar on the RCD side with the RCD on I got 113Volts.
If I removed 1 circuit at a time from the CU the voltage dropped until all circuits were removed & the voltage was zero.
Load live to load Neutral 0v
What do you think is going on here ?