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EV Charger Design Advice

NE-ELEC-12

Hi All,

We are currently liaising with a Client regarding a project where they have not been with the D&B contractor in terms of quality of the installation, and ultimately the electrical design. The Client is asking for us via a new D&B Contractor to review the design and current installation to see what can / cannot be utilised going forward.

 One of the items of concern that stands out immediately is the original design is the use of a 5 core SWA cable to supply 2 No. EV charging points. With both charging points being single phase on separate ways within the distribution board. Way L1 using cores 1+2, with way L2 using cores 3+4 we have not yet opened up the EV Charge points to see if core 5 is spare with the SWA being a common CPC, or whether core 5 is used as common CPC. 

We have concerns regarding the use of a cable with multiple single phase circuits within it, and the use of a common CPC for both circuits, is this allowable with in the regulations?

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    If I understand correctly there are 2 neutrals in the cable, as well as two lives ? That is OK, and the CPC will sensibly only be called upon to serve and disconnect a dead short fault in one charger at a time, so that sounds OK too.  It is a slightly unusual use of  SWA intended for 3 phase, but not breaking any rules,  and fine so long as neutrals are clearly identifiable. 

    It sounds like you could add a 3rd charger if you put a 3 phase ganged breaker at the supply end and then had a little breakout pillar beside or near the chargers to break out the 3 phases.

    Mike.

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  • 0

    If I understand correctly there are 2 neutrals in the cable, as well as two lives ? That is OK, and the CPC will sensibly only be called upon to serve and disconnect a dead short fault in one charger at a time, so that sounds OK too.  It is a slightly unusual use of  SWA intended for 3 phase, but not breaking any rules,  and fine so long as neutrals are clearly identifiable. 

    It sounds like you could add a 3rd charger if you put a 3 phase ganged breaker at the supply end and then had a little breakout pillar beside or near the chargers to break out the 3 phases.

    Mike.

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