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EV Charging in Car Park

Mark Fleming

Hi All,

We are looking at installing a number of  EV chargers in a 2 storey car park. The chargers will be located on the ground floor around the perimeter within the building footprint.

The car park is not enclosed and is exposed to the elements as shown in the picture, so the question is can we still connect direct to a PME supply as it is indoors or would you recommend we do a calculation to satisfy 722.411.4.1 (ii) using the embedded structural steel work as the earth electrode?

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    Electrically speaking, there is a far greater shock hazard from having the metal steels and the car body not connected, as the chance of a solid contact to both is very credible.  The outdoor thing is a red herring, as only users with limbs like Mr Tickle will be able to make good contact to ta parked  car and the earth outside without touching the steel. Earth to the steel and do not split the earthing. Do however verify how the building steel is earthed - I suspect it will make a pretty decent electrode - far better than anything you could hammer in without major works and a digger, unless for some reason the joints are insulating - so that should just be checked.

    Mike.

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    Electrically speaking, there is a far greater shock hazard from having the metal steels and the car body not connected, as the chance of a solid contact to both is very credible.  The outdoor thing is a red herring, as only users with limbs like Mr Tickle will be able to make good contact to ta parked  car and the earth outside without touching the steel. Earth to the steel and do not split the earthing. Do however verify how the building steel is earthed - I suspect it will make a pretty decent electrode - far better than anything you could hammer in without major works and a digger, unless for some reason the joints are insulating - so that should just be checked.

    Mike.

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