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Balanced 3 Phase Supply for EVC

Mark Fleming

Hi,

Please could someone advise on the following regarding EV chargers on a balanced 3 phase supply. 

We are proposing to install 3 x 75kw DC rapid chargers from a new DNO connection solely for the EV chargers. The chargers themselves only require 3 phase & earth and the only 230v supply from the new connection is a small anti-condensation heater within the feeder pillar (20w). 

Can I therefor still use the rule of thumb from CoP J4 as Regulation 722.411.4.1 (i) has now been removed from amendment 2? 

When I calculate using Regulation 722.411.4.1 (ii) I end up with a minus number so I assume this shows an earth electrode & PME supply is not suitable?

Thank you in advance.

Mark

Parents
  • 0

    Indeed, though here is a shiny new DNO connexion solely for the chargers isn't it?  - I presume that means that  the transformer is spoken for by the chargers, or at least a large chunk of it. This is not a small extra load on a big factory  installation.
    mike

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  • 0

    Indeed, though here is a shiny new DNO connexion solely for the chargers isn't it?  - I presume that means that  the transformer is spoken for by the chargers, or at least a large chunk of it. This is not a small extra load on a big factory  installation.
    mike

Children
  • 0 in reply to mapj1

    Yes, it will be a new connection solely for the chargers.

  • 0 in reply to Mark Fleming

    I wonder if Mike was thinking that if it's from a dedicated transformer you might be able persuade the DNO to give you a non-PME supply (TN-S or PNB).

       - Andy.

  • 0 in reply to AJJewsbury

    We do get a TN-S when possible, saves all the maths and a bit of money. 

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