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EV CHARGING EQUIPMENT

John Peckham
I am hearing from my network of contractors, that have actually read the new 722, that they have been asking charging equipment manufactures for documentary proof to comply with Note 5 of 722.411.4.


They are getting knocked back for asking or in one case a Declaration that says the particular device complies with BS 7671. I think that is wrong to declare that as BS 7671 is an installation safety standard and not a product standard. I believe that as a minimum the equipment must comply with the Low Voltage Directive and be CE marked. I also believe that manufacturers have to issue a Declaration of Conformity. 


BS 7671 722 has numerous references to the various standards required such as BS EN 61851 that the equipment must comply with. I am thinking it may be illegal to offer the sale of equipment that does not comply with the Low Voltage Directive and is not CE marked?


I am hoping the countries top man of equipment safety standards, Paul Skyrme , sees this post and will come on and give us his expert view?


Has any forum member asked for a Declaration of Conformity from EV charging equipment manufacturers and received one?
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    davezawadi:

    Yes Andy, but that will put the short circuit ability  (which may be an amp if its a good battery) through the RCD and we are working on milli-amps of DC! A 1k resistor also in the battery circuit will give 9mA etc.




    Agreed - that's effectively what we have with EV charging equipment pilot, but the source is 12 V not 9 V.


    How much is shared with the Neutral depends on the resistances of the conductors upstream back to the point of common coupling.


    Therefore in a TT system, the risk is less than a TN system, and TN-S lower DC current is likely to be shared than in a TN-C-S (PME) installation.

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  • 0

    davezawadi:

    Yes Andy, but that will put the short circuit ability  (which may be an amp if its a good battery) through the RCD and we are working on milli-amps of DC! A 1k resistor also in the battery circuit will give 9mA etc.




    Agreed - that's effectively what we have with EV charging equipment pilot, but the source is 12 V not 9 V.


    How much is shared with the Neutral depends on the resistances of the conductors upstream back to the point of common coupling.


    Therefore in a TT system, the risk is less than a TN system, and TN-S lower DC current is likely to be shared than in a TN-C-S (PME) installation.

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