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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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    Mike

    I have tested one 30 mA so far. The results are interesting, particularly that I couldn't make it work on a 250W isolating TX with TN-S output at all, PFCC 16A. So a bit of wiring to give me a non-RCD protected 13A socket, and things got better. I used a Megger MFT 1552 tester which gives 4 options for the delta In test, 0, 180 degrees and +,- DC. I used a lab supply with CC output strainght across the N of the RCD, no Rs and Cs for me! DC current measured with a Fluke multimeter as below the PSU meter resolution. The RCD (I will not reveal the make yet) was brand new supplied in a 18th ed metal CU. First test at 0 DC although all the equipment connected gave (30 mA ramp) AC 0 12ms, AC 180 7.6ms,DC + 18ms and DC - 7.5ms. So all passed with flying colours, trip times about 20ms at 30 mA all round. 10 MA of DC changed the AC 180 to 21 mA and DC+ to 12 mA,Others much the same, but results very  repeatable. 20mA DC not much change. 30 mA DC stopped AC trip altogether (both phases) and DC-, but DC plus still tripped at 18ms.


    Next change to 5 delta In (150 mA). Here up to 100 mA of DC made little change on AC test, I haven't done DC yet as SWMBO is wanting a hedge trimmed! I will look out some others to see what they do, but not exactly as expected for a EN61008-1 RCCB (80A).
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  • 0
    Mike

    I have tested one 30 mA so far. The results are interesting, particularly that I couldn't make it work on a 250W isolating TX with TN-S output at all, PFCC 16A. So a bit of wiring to give me a non-RCD protected 13A socket, and things got better. I used a Megger MFT 1552 tester which gives 4 options for the delta In test, 0, 180 degrees and +,- DC. I used a lab supply with CC output strainght across the N of the RCD, no Rs and Cs for me! DC current measured with a Fluke multimeter as below the PSU meter resolution. The RCD (I will not reveal the make yet) was brand new supplied in a 18th ed metal CU. First test at 0 DC although all the equipment connected gave (30 mA ramp) AC 0 12ms, AC 180 7.6ms,DC + 18ms and DC - 7.5ms. So all passed with flying colours, trip times about 20ms at 30 mA all round. 10 MA of DC changed the AC 180 to 21 mA and DC+ to 12 mA,Others much the same, but results very  repeatable. 20mA DC not much change. 30 mA DC stopped AC trip altogether (both phases) and DC-, but DC plus still tripped at 18ms.


    Next change to 5 delta In (150 mA). Here up to 100 mA of DC made little change on AC test, I haven't done DC yet as SWMBO is wanting a hedge trimmed! I will look out some others to see what they do, but not exactly as expected for a EN61008-1 RCCB (80A).
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