EVSE DC earth leakage limits with slowly increasing current

Hi, I am testing a product that has been certified to meet TUV IEC 62955.

I have tested the DC earth leakage and found that if the earth leakage rate of change is kept over 10uA per second the product will trip correctly (under 6mA).

If the rate of change is less than this the product will not trip until currents of 15mA (or greater) are reached.

Is this product safe to be installed?

Thanks,

Nick

 

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  • Tester manufacturers have been tweaking their testers due to testing issues, why are you testing?

    support.myenergi.com/.../4403885493265-zappi-6mA-DC-protection-to-IEC-62955

  • also very interesting - as an electronic equipment design authority, the test is not that ambiguous to me (!)- either the DC appears semi-prompt for one test, or rises by 4mA in 30 seconds from 2mA to 6mA in the other.

    Anything that is a non linear ramp has faster sections than the linear (hardest) case, so the responsible designer should be happy it will trip inside this, say linearly from just over 2mA to just under 6mA also ramping in rather longer than 30 seconds...
    With modern digital test gear smooth ramps may be thought of as hard by the software types , and faked by a staircase on a DAC, but a combination of suitably fine steps and or analogue smoothing of that should be possible. I wonder how they can make something that  fails that and not notice.

    Mike

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  • also very interesting - as an electronic equipment design authority, the test is not that ambiguous to me (!)- either the DC appears semi-prompt for one test, or rises by 4mA in 30 seconds from 2mA to 6mA in the other.

    Anything that is a non linear ramp has faster sections than the linear (hardest) case, so the responsible designer should be happy it will trip inside this, say linearly from just over 2mA to just under 6mA also ramping in rather longer than 30 seconds...
    With modern digital test gear smooth ramps may be thought of as hard by the software types , and faked by a staircase on a DAC, but a combination of suitably fine steps and or analogue smoothing of that should be possible. I wonder how they can make something that  fails that and not notice.

    Mike

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