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EV charger on outside of wooden detached outbuilding

Alan B

Hi

I am being asked to quote for installing a domestic EV charger on the outside of a detached outbuilding that's constructed of wood. the charger is constructed of plastic.

The building is 20 or 30m from the house is 20 or so meters from the house so no risk of fire spreading to a dwelling.

The SWA from house to DB in the building is protected by an MCB and my plan is to use a metal DB in the building with RCBO's for each circuit which will help reduce the risk of fire to some extent.

Looking through BS7671 and guidance note 4 I can't find any rules requiring me to mount the charger on a non flammable surface but not sure I am comfortable with it.

The charger won't get hot under normal conditions but given it's carrying quite a lot of current presumably there is a chance that a fault could cause fire.

I am wondering if there are rules I have missed, if others would take any precautions and what they are.

I have looked at fibre cement board which could be a solution for internal mounting but I think the charger would be better outside and I don't see the customer accepting fibre cement board being visible outside.

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    We've a long history of mounting all sorts of things on wooden surfaces - from pine clad ceilings to timber wall paneling to joint boxes in floor voids, even (in older days and possibly not technically correctly) open backed CUs on softwood boards - without any major problems. I'd assume the charge point plastic case will be of the usual electrical grade plastic that's at least meant to be survive a glow-wire test, so to be honest I wouldn't be too worried about it.

       - Andy.

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    We've a long history of mounting all sorts of things on wooden surfaces - from pine clad ceilings to timber wall paneling to joint boxes in floor voids, even (in older days and possibly not technically correctly) open backed CUs on softwood boards - without any major problems. I'd assume the charge point plastic case will be of the usual electrical grade plastic that's at least meant to be survive a glow-wire test, so to be honest I wouldn't be too worried about it.

       - Andy.

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