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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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    I see no issue providing you have faith in the open pen device. It opens the earth connection to the car in the event of an open pen.. Metal post to body of car in normal operation could tingle, however. 
    There must be millions of bits of class 1 kit  sitting outside buildings that are permanently connected to TN-C-S systems. At least your kit has an additional control measure in terms of the open pen device. 
    As you are both designer and contractor , you do right to explore the risks as you would have a duty to consider them under CDM Regs.

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    I see no issue providing you have faith in the open pen device. It opens the earth connection to the car in the event of an open pen.. Metal post to body of car in normal operation could tingle, however. 
    There must be millions of bits of class 1 kit  sitting outside buildings that are permanently connected to TN-C-S systems. At least your kit has an additional control measure in terms of the open pen device. 
    As you are both designer and contractor , you do right to explore the risks as you would have a duty to consider them under CDM Regs.

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