I am currently charging my Audi Q5 hybrid using the Audi supplied portable control unit. This is from my garage which is a separate TN-C-S 3phase supply, from a separate 32A RCBO through an industrial socket to get the full 7kw - and all is well.
I have an option to supply from the separate house single phase supply (which I'm sure is also TN-C-S), through a pre-installed buried 4mm/2 cable. When testing this arrangement, as soon as I plug in and switch the isolator for the same Audi unit cable (no load), both RCD's on the house split board trip. If it were just the half of the board where its fed from, I might suspect cumulative leakage being taken over the top. But why would both RCD's trip?
Any ideas or similar experience?
I have an option to supply from the separate house single phase supply (which I'm sure is also TN-C-S), through a pre-installed buried 4mm/2 cable. When testing this arrangement, as soon as I plug in and switch the isolator for the same Audi unit cable (no load), both RCD's on the house split board trip. If it were just the half of the board where its fed from, I might suspect cumulative leakage being taken over the top. But why would both RCD's trip?
Any ideas or similar experience?