The IET is carrying out some important updates between 17-30 April and all of our websites will be view only. For more information, read this Announcement

Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 13 replies
  • Subscribers 31 subscribers
  • Views 2616 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

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.
Parents
  • 0

    I'm struggling to imagine any situation when I'd want to bond the post to the supply CPC.

    The same earth as the car body perhaps - i.e. the one that is downstream of the PEN fault detector or TT - there I can see an argument that you may make good contact with both at once.

    I wonder how well the post is earthed, I think there are 2 cases, one where it is it's  own electrode, and a second where it is it sort of floating 

    Are there others ? 

    in neither case can  it introduce a dangerous voltage relative to someone standing beside it, nor that connecting it to a PEN would help very much.

    I suppose a problem if some odd fault inside the charger that makes the mounting screws live, but there must be better ways of making that incredibly unlikely that do not expose the PEN voltage to touch.

    Mike.

     

     

Reply
  • 0

    I'm struggling to imagine any situation when I'd want to bond the post to the supply CPC.

    The same earth as the car body perhaps - i.e. the one that is downstream of the PEN fault detector or TT - there I can see an argument that you may make good contact with both at once.

    I wonder how well the post is earthed, I think there are 2 cases, one where it is it's  own electrode, and a second where it is it sort of floating 

    Are there others ? 

    in neither case can  it introduce a dangerous voltage relative to someone standing beside it, nor that connecting it to a PEN would help very much.

    I suppose a problem if some odd fault inside the charger that makes the mounting screws live, but there must be better ways of making that incredibly unlikely that do not expose the PEN voltage to touch.

    Mike.

     

     

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines