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EV CHARGING EQUIPMENT

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 David Stone over 4 years ago

Does anyone have any technical documentation (from IEC or whatever) as to why EV charging points need DC sensitive RCDs? I have a large inverter MIG welder (450A, approx 15kVA max) which is basically a large switch mode PSU. It has all the modern bells and whistles like PF of 1 and obviously gives DC out, just like an electric vehicle. Does this mean that its socket (3ph 63A) needs a fancy RCD if I were to fit one? After some analysis I cannot see why any reasonable fault would give a DC leakage sufficient to prevent normal RCD operation, and therefore wonder if this EV requirement is even sensible, or thought up by someone with nothing better to do or perhaps a manufacturer wanting to increase sales revenue. It is often quoted that this is due to the fact that the mains comes to a rectifier first which could pass current in only one direction, but whether this prevents RCD operation is a moot point. It would also require multiple faults (earth fault and electronic fault which did not stop operation), which is pretty unlikely. Perhaps I need to do some more experiments with rectified leakages? Thoughts welcome....
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0 David Stone over 4 years ago

Does anyone have any technical documentation (from IEC or whatever) as to why EV charging points need DC sensitive RCDs? I have a large inverter MIG welder (450A, approx 15kVA max) which is basically a large switch mode PSU. It has all the modern bells and whistles like PF of 1 and obviously gives DC out, just like an electric vehicle. Does this mean that its socket (3ph 63A) needs a fancy RCD if I were to fit one? After some analysis I cannot see why any reasonable fault would give a DC leakage sufficient to prevent normal RCD operation, and therefore wonder if this EV requirement is even sensible, or thought up by someone with nothing better to do or perhaps a manufacturer wanting to increase sales revenue. It is often quoted that this is due to the fact that the mains comes to a rectifier first which could pass current in only one direction, but whether this prevents RCD operation is a moot point. It would also require multiple faults (earth fault and electronic fault which did not stop operation), which is pretty unlikely. Perhaps I need to do some more experiments with rectified leakages? Thoughts welcome....
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EV CHARGING EQUIPMENT

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