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Hi.

We have a new build with a detached garage with its own fuse board that comes from the main fuse board in the house. The garage is currently supplied off a 40 amp fuse in the main board but can be increased to 50 amp. Can an EV wall charger be wired to this fuse box in the garage or does it have to go back to the main fuse box? An electrician tested the load in the garage and confirmed there is spare capacity for a 32 amp charger if the garage breaker was increased to 50 amp in the main board.

To avoid external cable runs I would ideally like the power to come from the fuse board in the garage and fix the charger to the external wall. The cable running to the garage is 10mm.

Any suggestions would be appreciated.
 

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If its a 10mm cable then no problems at all ! will probably need an earth rod if one not already fitted, and a separate RCD
 

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You may need to ensure that other garage circuits are on a 16a breaker(total for all circuits), as no diversity is allowed on charging circuits. Otherwise should be fine
 

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You may need to ensure that other garage circuits are on a 16a breaker(total for all circuits), as no diversity is allowed on charging circuits. Otherwise should be fine
Diversity is allowed on submains though...

You dont go thru the main house distribution board and ensure the breakers all add up to less than the main fuse... This is no different. Its a 50A submain feeding a DB, which happens to be feeding an EV charger amongst other things.

Personally, i'd split the tails and feed the garage submain from a switchfuse, just to ensure its away from the house RCD's etc.
 
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