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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?

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  • 0

    Thanks to all for your contributions.

    Seems I was right to be confused.  I'm particularly surprised that 5mA is considered acceptable from the EV itself but the PE connection is monitored so the EVSE will disconnect in the event of a broken PE. 

    The EVSE signalling is not so much of a concern (barring significant faults) as the CP signal is 12v and a maximum of 9mA at 1kHz, or 12mA DC into a short circuit,  The PP signal is 5v and a maximum of 15mA into a short circuit.  These currents are only in the PE connection between the EVSE and EV not in the supply CPC so they are never seen by the rest of the installation.

    Many thanks.

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  • 0

    Thanks to all for your contributions.

    Seems I was right to be confused.  I'm particularly surprised that 5mA is considered acceptable from the EV itself but the PE connection is monitored so the EVSE will disconnect in the event of a broken PE. 

    The EVSE signalling is not so much of a concern (barring significant faults) as the CP signal is 12v and a maximum of 9mA at 1kHz, or 12mA DC into a short circuit,  The PP signal is 5v and a maximum of 15mA into a short circuit.  These currents are only in the PE connection between the EVSE and EV not in the supply CPC so they are never seen by the rest of the installation.

    Many thanks.

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  • 0 in reply to Sailbadthesinner
    Sailbadthesinner said:
    These currents are only in the PE connection between the EVSE and EV not in the supply CPC so they are never seen by the rest of the installation.

    Unless there's an N-PE fault between the EVSE and EV, in which case the current may be shared by the installation neutral through the point at which PE is split from N - i.e. in TN-C-S, the service head.

  • 0 in reply to gkenyon

    True, hence the 'barring significant faults'.  But as the open circuit voltages are so low these currents are not a safety concern unless they blind an RCD, then the RDCDD or Type B RCD should deal with that.

    Thanks.

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