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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:

    I am not disagreeing with you Graham, just trying to air the subject as fully as possible.


    The next question may be slightly painful to some, and that is: Who in a suitable position to understand the problem signed up to accepting standards which are basically faulty in concept? There appears to be no suitable way in an urban environment where an electric vehicle can be guaranteed to be free of the PME system, even if the supply is "TTed" with a local electrode. So quite simply the now common problem of a lost N connection can make a car significantly dangerous however many RCDs of whatever type are in place. The answer is that we now need to monitor electrode to neutral voltage and disconnect the vehicle completely, including the Earth and control wires, should this voltage exceed some value, say 55V RMS for discussions sake. This disconnection needs to be permanent needing a reset back to the no fault condition and substantially instant. Such a device is fairly simple and cheap to manufacture, but we don't have a requirement to fit one. Instead we have all kinds of very expensive RCDs which do not provide anything like the same level of protection. So lets make a new standard, to incorporate such a device in every charge point, which fixes the problem for good.




    Only the UK seem to have a serious problem with the lost Neutral ... other countries seem to be getting on with it with little or no fuss.


    Some other countries banned the use of Type A RCDs many years ago, so they will only need an RDC-DD (or that built into the charger).


    To a certain extent, the RCD issue has nothing directly to do with EV's - it's a problem generally, that will increase with the increasing use of embedded generation, and certain electronic devices (some of which are not so modern but were perhaps preventing Type AC RCDs from operating all along).

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    davezawadi:

    I am not disagreeing with you Graham, just trying to air the subject as fully as possible.


    The next question may be slightly painful to some, and that is: Who in a suitable position to understand the problem signed up to accepting standards which are basically faulty in concept? There appears to be no suitable way in an urban environment where an electric vehicle can be guaranteed to be free of the PME system, even if the supply is "TTed" with a local electrode. So quite simply the now common problem of a lost N connection can make a car significantly dangerous however many RCDs of whatever type are in place. The answer is that we now need to monitor electrode to neutral voltage and disconnect the vehicle completely, including the Earth and control wires, should this voltage exceed some value, say 55V RMS for discussions sake. This disconnection needs to be permanent needing a reset back to the no fault condition and substantially instant. Such a device is fairly simple and cheap to manufacture, but we don't have a requirement to fit one. Instead we have all kinds of very expensive RCDs which do not provide anything like the same level of protection. So lets make a new standard, to incorporate such a device in every charge point, which fixes the problem for good.




    Only the UK seem to have a serious problem with the lost Neutral ... other countries seem to be getting on with it with little or no fuss.


    Some other countries banned the use of Type A RCDs many years ago, so they will only need an RDC-DD (or that built into the charger).


    To a certain extent, the RCD issue has nothing directly to do with EV's - it's a problem generally, that will increase with the increasing use of embedded generation, and certain electronic devices (some of which are not so modern but were perhaps preventing Type AC RCDs from operating all along).

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