Every time I try to switch ring main on it trips off at CUWhat exactly is tripping? Sounds like you need an electrician.
It is wired back to another CU in my workshop integral with the house which it trips as well as the mini CU in the garage.What trips off, MCB, RCD, RCBO.
How is it wired to garage FCU, mini CU come one give us a chance.
No changes to circuit & everything has been unplugged including electric doors.Have any changes been made to the circuit?
Have you unplugged absolutely everything on the circuit?
No changes to circuit & everything has been unplugged including electric doors.
Yes apologies the MCB for garage supply trips.Thing is, CUs do not trip. Some device inside them does. People need to know what is written on that device.
I am confident, that with your help here, I can find & fix the fault.Best next step is to get a competent local spark imho
Yes, I can understand that in principal but I am unsure how it is precisely achieved.When trying to trace a problem with my daughters house, I had to split the ring final. And then test smaller and smaller sections until I have found the section at fault. But pictures can replace a 1000 words, give us a clue what you have.
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