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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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  • 0

    The Type B (or Type A or F plus RDC-DD) would still be required for the EVSE.


    I don't think there's a requirement (or need) for upstream devices to be anything more onerous than Type A, as the downstream device detects the DC residual current fault. A few manufacturers have been supplying Type A rather than Type AC for a few years now.



    If you've got a type B RCD for the charge point it seems you can't be confident that the d.c. fault will be disconnected unless the d.c. residual current is above 60mA - while 6mA appears to be sufficient to disrupt an upstream A type. I gather that d.c. faults in typical mode 3 system could be naturally limited - perhaps to 12 or 15mA - or even less when the fault may take parallel paths only some of which pass through the supply RCD(s).


    If you've got an A EV type RCD or RDC-DD for the charge point then d.c. faults over 6mA should be disconnected - which should indeed protect upstream A-type RCDs provided there are no other sources of d.c. fault currents. If you have multiple charge points then you're perhaps back to having a risk of the cumulative d.c. residual current seen by upstream RCDs exceeding 6mA again (depending on your view of how many faults to danger you're willing to accept, baring in mind that these faults may not be detected either automatically or during an EICR (as a broken c.p.c. should be)).


       - Andy.
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  • 0

    The Type B (or Type A or F plus RDC-DD) would still be required for the EVSE.


    I don't think there's a requirement (or need) for upstream devices to be anything more onerous than Type A, as the downstream device detects the DC residual current fault. A few manufacturers have been supplying Type A rather than Type AC for a few years now.



    If you've got a type B RCD for the charge point it seems you can't be confident that the d.c. fault will be disconnected unless the d.c. residual current is above 60mA - while 6mA appears to be sufficient to disrupt an upstream A type. I gather that d.c. faults in typical mode 3 system could be naturally limited - perhaps to 12 or 15mA - or even less when the fault may take parallel paths only some of which pass through the supply RCD(s).


    If you've got an A EV type RCD or RDC-DD for the charge point then d.c. faults over 6mA should be disconnected - which should indeed protect upstream A-type RCDs provided there are no other sources of d.c. fault currents. If you have multiple charge points then you're perhaps back to having a risk of the cumulative d.c. residual current seen by upstream RCDs exceeding 6mA again (depending on your view of how many faults to danger you're willing to accept, baring in mind that these faults may not be detected either automatically or during an EICR (as a broken c.p.c. should be)).


       - Andy.
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