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EV Charger mounting post - earthing arrangement

Martin Johnson

I'm looking for advice for mounting an EV Charger on a metal post that a customer has installed for this purpose, it's located in his parking space on his driveway. The charger he has purchased is a Pod Point model which has inbuilt PEN fault detection. The armoured cable to supply it will be protected by a double pole type A RCD. The supply is PME. My thoughts are:-

  1. The metal post set in the ground is an extraneous conductive part. The EV charger earth will not be connected to this metal post and therefore there will be a small potential difference between it and the car charger earth (which I guess is connected to the car?)
  2. I don't like the idea of bonding the (PME) supply to the metal post.
  3. Has anyone installed an EV charger on a metal post?  Several manufacturers sell them as accessories to their range of EV chargers, nearly all have built-in PEN protection now.
  4. All advice and comments will be gratefully received.
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    The EV charger is a Class 2, and a Class one device, according to their .pdf instructions.

    That's a common confusion - it's in a plastic case with no exposed-conductive-parts so as far as that box is concerned it's very much like Class II (i.e. it's a good arrangement to have outside the equipotential zone) - however it still needs a PE connection - not for itself but to pass onto the car (and possibly for its own functional use, but not to provide shock protection for itself) - so it needs to be supplied as if it were Class I. Sort of Class I + II really.

       - Andy.

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  • 0

    The EV charger is a Class 2, and a Class one device, according to their .pdf instructions.

    That's a common confusion - it's in a plastic case with no exposed-conductive-parts so as far as that box is concerned it's very much like Class II (i.e. it's a good arrangement to have outside the equipotential zone) - however it still needs a PE connection - not for itself but to pass onto the car (and possibly for its own functional use, but not to provide shock protection for itself) - so it needs to be supplied as if it were Class I. Sort of Class I + II really.

       - Andy.

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