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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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  • Former Community Member
    0 Former Community Member

    Sparkingchip:

    What are the standards for “granny leads”?




    IEC 62752 In-cable control and protection device for mode 2 charging of electric road vehicles (IC-CPD)

    or the localized BS EN 62752




    Can they and do they actually leak DC current, why don’t they have an inline RCD in their flex like some of the portable hot tubs?




    "Granny Leads" incorporate some kind of type B RCD, a 2-pole contactor for L and N, a contactor for CPC, a CPC-checker and some stuff to generate and monitor the CP-signal.


    Even though the tires are made of rubber they contain some carbon black.

    So an EV presents an earthing resistance of a few kOhms to some 100 kOhms.

    This impedance is far to high to provide a safe earthing but also far from insulation.

    So we have to verify the CPC connection by the charging cable.


    Before closing the CPC contact the "Granny Lead" can compare the voltages at both ends of the CPC conductor.

    If the voltages are almost the same then the upstream CPC is most likely connected to Earth and you can proceed by closing the CPC connection.

    After establishing a PE-connection to the EV the "Granny Lead" can communicate to the EV using the CP-Signal.

    If the EV requests charging the "Granny Lead" closes the second contactor and connects N and L to the EV.


    The charging current is now monitored by some kind of a type B RCD.

    The tripping curves are a little bit different from IEC61423 (type B RCD) to IEC 62955 (RDC-DD) to IEC 62752 (IC-CPD) but they all monitor DC-fault currents.


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  • Former Community Member
    0 Former Community Member

    Sparkingchip:

    What are the standards for “granny leads”?




    IEC 62752 In-cable control and protection device for mode 2 charging of electric road vehicles (IC-CPD)

    or the localized BS EN 62752




    Can they and do they actually leak DC current, why don’t they have an inline RCD in their flex like some of the portable hot tubs?




    "Granny Leads" incorporate some kind of type B RCD, a 2-pole contactor for L and N, a contactor for CPC, a CPC-checker and some stuff to generate and monitor the CP-signal.


    Even though the tires are made of rubber they contain some carbon black.

    So an EV presents an earthing resistance of a few kOhms to some 100 kOhms.

    This impedance is far to high to provide a safe earthing but also far from insulation.

    So we have to verify the CPC connection by the charging cable.


    Before closing the CPC contact the "Granny Lead" can compare the voltages at both ends of the CPC conductor.

    If the voltages are almost the same then the upstream CPC is most likely connected to Earth and you can proceed by closing the CPC connection.

    After establishing a PE-connection to the EV the "Granny Lead" can communicate to the EV using the CP-Signal.

    If the EV requests charging the "Granny Lead" closes the second contactor and connects N and L to the EV.


    The charging current is now monitored by some kind of a type B RCD.

    The tripping curves are a little bit different from IEC61423 (type B RCD) to IEC 62955 (RDC-DD) to IEC 62752 (IC-CPD) but they all monitor DC-fault currents.


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