Test a socket ring main.

[kammx4]

A photo of the main house CU would be useful

Here is my main unit the 2nd RCD on the right is the bar one inside but the whole thing trips from the RCCB to the right side.

 

[Murdoch]

Here is my main unit the 2nd RCD on the right is the bar one inside but the whole thing trips from the RCCB to the right side.

Is the 2nd CU supplied by the unlabeled B32 MCB?

 

[kammx4]

A photo of the main house CU would be useful

 

[kammx4]

Is the 2nd CU supplied by the unlabeled B32 MCB?

Yes it is. just unplugged everything and everything stayed on for 10 mins then tripped out the RCCB in the house??.

 

[Murdoch]

My advice to you is to get the RCD's and RCBO's tested.

The 2nd CU has been installed "poorly" by somebody who doesn't really understand the regs and to "hang" an EV charger off it wasn't a great move.

Without proper test kit and competence you are wasting your time

 

[ProDave]

A single pole rcbo only disconnects live in the event of tripping, it leaves the neutral connected. Certain applications require a 2 pole protection device that disconnects both.

 

[Bruspark]

You can guess all you like... you'll be right eventually

... as others have said tripping can be one big issue or a result of many smaller issues. With appliances, wiroing This can cause much head scratching

After checking for visible water issues or cable damage you need a methodical approach and some test gear to narrow this down

 

[UNG]

Only a EV charging point by a qualified installer last August which is on a separate RCD.

Looking at the distribution arrangement I would have to ask an installer qualified in what, I doubt the proper application process has been carried out for the extra connected load of an EV and looking at the size of the sub main to the bar I doubt any calculations have been done to verify it has the capacity to feed an EV chargepoint as well as the bar which I would assume is heated using electric heaters so it is likely that it is overloaded at times

 

[ipf]

Qualified electrician required. Your son should be able to contact one.