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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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    Martin Johnson: 
    Hello and thank you for taking the time to share your thoughts. Having given it more thought over the weekend, I've now decided to try and persuade the customer to replace the metal mounting post with one that's made of a non-conducting material such as wood or GRP. 

    Why is the metal post unsuitable? Would the replacement post be suitable in terms of accidental damage? I'm fully aware Regulation 722.512.2.203 talks about public areas and car park sites, but that doesn't remove the requirement to consider the issues associated with external influences (in this case possible accidental impact) in a private driveway, as per the “general rules” (Chapters 1 to 5 of BS 7671).

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    Martin Johnson: 
    Hello and thank you for taking the time to share your thoughts. Having given it more thought over the weekend, I've now decided to try and persuade the customer to replace the metal mounting post with one that's made of a non-conducting material such as wood or GRP. 

    Why is the metal post unsuitable? Would the replacement post be suitable in terms of accidental damage? I'm fully aware Regulation 722.512.2.203 talks about public areas and car park sites, but that doesn't remove the requirement to consider the issues associated with external influences (in this case possible accidental impact) in a private driveway, as per the “general rules” (Chapters 1 to 5 of BS 7671).

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