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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

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  • +1
    Mark Fleming said:
    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? 

    Not if you want to comply with BS 7671:2018+A2:2022.

    Mark Fleming said:
    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?

    See Note 1 to A722.3 - you may be able to use 200 ohms as the answer if you have calculated the load imbalance neutral current correctly and it meets the criterial in Note 1.

Reply
  • +1
    Mark Fleming said:
    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? 

    Not if you want to comply with BS 7671:2018+A2:2022.

    Mark Fleming said:
    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?

    See Note 1 to A722.3 - you may be able to use 200 ohms as the answer if you have calculated the load imbalance neutral current correctly and it meets the criterial in Note 1.

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