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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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    Chris Pearson:




    gkenyon:

    BS 7671 does have another solution in Annex 722 for separation of the vehicle from the installation, if pockets are deep enough.




    And still this thread rumbles on.


    Graham if you had a PME supply (could be single or three phase) and deep pockets (deep enough to have bought an EV in the first place) which method would you choose please?


    Average semi with single-phase supply, I'd rather connect to the PME earth if at all possible, so I'd choose 722.411.4.1 (iii), (iv) or (v), with the following commentary:

    • My first choice would be a (iii) device, but for a single-phase supply a measurement earth electrode would be required. This may not always be practicable, as there has to be at least 2 m separation from this electrode buried metalwork connected to the PME system (see Annex I of 4th Ed CoP).

    • Following that, I would choose either (iv) or (v) device.


    With either option, of course, the first time I used the product I'd want to do some due diligence on the product.


    But overall in a small curtilage single-phase property, I think it's better to connect to PME using one of these devices, than try and make a separate TT system, given all the attendant issues of separation and the risk of striking buried services ... and the problems in future maintaining the separation.


    If I was going to install V2G system, then that's a different story, as the 722.411 (iv) and (v) devices are not available - but again in this case I'd prefer to use 722.411.4.1 (iii) device with earth electrode than a separate TT system.



    Please also clear up what may seem to be an elementary question. I understand the need to separate the earthing arrangements of different systems, which could lead to difficulty placing either a TT earthing rod or a reference electrode. So does the separation have to be from a PME electrode (in my case, I assume that would be a street lamp by the corner of my property) to an installation electrode; or does it have to be from a service cable to an installation electrode?


     




    The separation has to be between the separate TT installation earth electrode, and any buried uninsulated metalwork connected to the PME earthing system. If the PME (or public supply TN-S) service cable is PILC (paper insulated lead covered) then sure that's included as it's at PME earth potential.

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  • 0

    Chris Pearson:




    gkenyon:

    BS 7671 does have another solution in Annex 722 for separation of the vehicle from the installation, if pockets are deep enough.




    And still this thread rumbles on.


    Graham if you had a PME supply (could be single or three phase) and deep pockets (deep enough to have bought an EV in the first place) which method would you choose please?


    Average semi with single-phase supply, I'd rather connect to the PME earth if at all possible, so I'd choose 722.411.4.1 (iii), (iv) or (v), with the following commentary:

    • My first choice would be a (iii) device, but for a single-phase supply a measurement earth electrode would be required. This may not always be practicable, as there has to be at least 2 m separation from this electrode buried metalwork connected to the PME system (see Annex I of 4th Ed CoP).

    • Following that, I would choose either (iv) or (v) device.


    With either option, of course, the first time I used the product I'd want to do some due diligence on the product.


    But overall in a small curtilage single-phase property, I think it's better to connect to PME using one of these devices, than try and make a separate TT system, given all the attendant issues of separation and the risk of striking buried services ... and the problems in future maintaining the separation.


    If I was going to install V2G system, then that's a different story, as the 722.411 (iv) and (v) devices are not available - but again in this case I'd prefer to use 722.411.4.1 (iii) device with earth electrode than a separate TT system.



    Please also clear up what may seem to be an elementary question. I understand the need to separate the earthing arrangements of different systems, which could lead to difficulty placing either a TT earthing rod or a reference electrode. So does the separation have to be from a PME electrode (in my case, I assume that would be a street lamp by the corner of my property) to an installation electrode; or does it have to be from a service cable to an installation electrode?


     




    The separation has to be between the separate TT installation earth electrode, and any buried uninsulated metalwork connected to the PME earthing system. If the PME (or public supply TN-S) service cable is PILC (paper insulated lead covered) then sure that's included as it's at PME earth potential.

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