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EVSE Earth leakage limits

Sailbadthesinner

Anyone know what earth leakage current limit applies for an EVSE?

For regular Type 2 Mode 3 32A 7kW or 21kW AC charge points.

For the purposes of in service inspection and testing is there an earth leakage limit specified by an applicable product standard?

I'm not talking about DC leakage currents (whole different can of worms).

They are (generally) built double insulated so does a 0.25mA Class II limit apply?

They supply an EV which is definitely Class 1, they are not handheld but are certainly a similar touch voltage shock risk, so does a 0.75mA limit apply?

They are fixed equipment (strictly the EV isn't fixed but that's splitting hairs), but not motor operated (certainly while charging), so does a 3.5mA limit apply?

Your learned thoughts appreciated?

Parents
  • +1

    AC EVSE (without vehicle) has the following touch-current limits according to BS EN IEC 61851-1:2019 and BS EN 61851-22:2002.

    The test is made when the EVSE is functioning with a resistive load at rated output power.

    In addition, BS EN 61851-21 permitted up to 5 mA of additional "leakage" from the vehicle.

    Therefore, up to 8.5 mA AC may be expected - I always tell people to expect 9-10 mA combined because occasionally, it's on the verge of "might just operate" the 30 mA RCD mandated by BS 7671. There's certainly no overhead for other equipment on the same circuit.

    Plus on the protective conductor itself (between PC and PE) there is the DC/pulsed DC of the pilot, don't forget.

  • 0 in reply to gkenyon

    This is a new one to me, and it seems quite oddly worded - as I presume you have a copy, could you clarify what is a 'network pole' in this context please ?  It also reads as if touch current is interpreted quite differently to the way we would for an appliance and really means non diverted CPC current.

    M

  • 0 in reply to mapj1
    mapj1 said:
    could you clarify what is a 'network pole' in this context please

    Live conductor - not uncommon.

    mapj1 said:
    It also reads as if touch current is interpreted quite differently to the way we would for an appliance and really means non diverted CPC current.

    I think you can view it like that, but again this is becoming more common in product standards.

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  • 0 in reply to mapj1
    mapj1 said:
    could you clarify what is a 'network pole' in this context please

    Live conductor - not uncommon.

    mapj1 said:
    It also reads as if touch current is interpreted quite differently to the way we would for an appliance and really means non diverted CPC current.

    I think you can view it like that, but again this is becoming more common in product standards.

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