EV Charging in Car Park

Question

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?

AJJewsbury · Accepted Answer

If all that metalwork is nicely bonded, I'd be happy treating it as "indoors" (see also 717.411.4 (ii) for a similar situation addressing the same problem) - really it's the extent of what we used to call the main equipotential zone that's the consideration, rather than exposure to the weather per se. 
 Use an open-pen detection device (often built into charge points these days) if you want some additional reassurance. 
 - Andy.

EV Charging in Car Park

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