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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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    I think the manufacturers have, for the most part, sorted the open PEN issue such that the risk is now at a tolerable level. Should be as simple as fitting a shower! 
    All the fuss about shock has dissipated but I was always more concerned about fire than shock. The COP has loads of pages devoted to open PEN concerns but really little to say about the fire risk.

    Likely with the withdrawal of the grant for the private domestic sector we will have all sorts of uncontrolled installations driven by cost to the lowest levels of concern for safety. Packed plastic consumer units buried under a pile of tat under the stairs with a charge point squeezed in for good measure! Open PEN, bah by comparison!

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  • 0

    I think the manufacturers have, for the most part, sorted the open PEN issue such that the risk is now at a tolerable level. Should be as simple as fitting a shower! 
    All the fuss about shock has dissipated but I was always more concerned about fire than shock. The COP has loads of pages devoted to open PEN concerns but really little to say about the fire risk.

    Likely with the withdrawal of the grant for the private domestic sector we will have all sorts of uncontrolled installations driven by cost to the lowest levels of concern for safety. Packed plastic consumer units buried under a pile of tat under the stairs with a charge point squeezed in for good measure! Open PEN, bah by comparison!

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