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EVC's & RCD's - a question for Mr Kenyon

Tolly

Mr Kenyon,

If you would be so kind, elsewhere, it has been suggested that an EVC can be supplied from one of the RCCB's in a domestic split-load board. I, however, referred to Section 6.12.3 of the EVC CoP (4th ed) that states that 'Every charging point shall be individually protected by an RCD...', taken to mean that the RCD shall only supply the EVC, on its own cct, nothing else. This was countered, however, with the idea that the CoP statement is ambiguous because it could equally mean that the RCD can simultaneously protect the EVC and other circuits, it's just that it must protect only one EVC along with the other ccts. 

Therefore, what is your intention with the entry in 6.12.3: the RCD connects to only one cct, or it can connect to a number of ccts, but only one cct can have an EVC? 

Thanks

T.

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    One of 10 22Kw twin units we installed from Garo. RCDs individually protect each socket. 300mA type A S-type RCD as main incomes in the DB supplying this pillar. 
    As far as I can see on the domestic side, the EVSE circuit is normally bunged in with other circuits in a split load board so RCD is not individual to the EVSE.

  • 0 in reply to lyledunn
    lyledunn said:
    As far as I can see on the domestic side, the EVSE circuit is normally bunged in with other circuits in a split load board so RCD is not individual to the EVSE.

       whilst this may have been happening, I think I know why, but it didn't make it right. Let me explain. Back in 2018, the requirement began as follows:

    722.531.2.101 Except for circuits using the protective measure of electrical separation, each charging point shall be protected by its own RCD of at least Type A, having a rated residual operating current not exceeding 30 mA.

    So, this said the outlet ('charging point') ought to have its own RCD although there would be nothing to stop that being fed by another, presumably one in a split load board??? (I will come back to this very shortly ... please keep reading.)

    Those who are diligent in reading BS 7671 and its amendments will be aware that in 2020 the requirement changed again in Amendment 1, and there was no mention of the charging point (outlet) having its own RCD:

    722.531.3.101 Unless supplied by a circuit using the protective measure of electrical separation, each chargingpoint incorporating a socket-outlet or vehicle connector complying with the BS EN 62196 series shall be protected by an RCD having a rated residual operating current not exceeding 30 mA.

    Is this an omission? Well, not if you consider that the general rules, Regulation 531.3.2, ought to have indicated unwanted tripping of a split-load board arrangement, or a single 30 mA RCD supplying two outlets ('charging points').

    However, it's clear the messages are getting mixed, and in 2022 we are back with a statement in 722.531.3.101 in my earlier reply, with the word 'individually' to at least try and indicate an issue.

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  • 0 in reply to lyledunn
    lyledunn said:
    As far as I can see on the domestic side, the EVSE circuit is normally bunged in with other circuits in a split load board so RCD is not individual to the EVSE.

       whilst this may have been happening, I think I know why, but it didn't make it right. Let me explain. Back in 2018, the requirement began as follows:

    722.531.2.101 Except for circuits using the protective measure of electrical separation, each charging point shall be protected by its own RCD of at least Type A, having a rated residual operating current not exceeding 30 mA.

    So, this said the outlet ('charging point') ought to have its own RCD although there would be nothing to stop that being fed by another, presumably one in a split load board??? (I will come back to this very shortly ... please keep reading.)

    Those who are diligent in reading BS 7671 and its amendments will be aware that in 2020 the requirement changed again in Amendment 1, and there was no mention of the charging point (outlet) having its own RCD:

    722.531.3.101 Unless supplied by a circuit using the protective measure of electrical separation, each chargingpoint incorporating a socket-outlet or vehicle connector complying with the BS EN 62196 series shall be protected by an RCD having a rated residual operating current not exceeding 30 mA.

    Is this an omission? Well, not if you consider that the general rules, Regulation 531.3.2, ought to have indicated unwanted tripping of a split-load board arrangement, or a single 30 mA RCD supplying two outlets ('charging points').

    However, it's clear the messages are getting mixed, and in 2022 we are back with a statement in 722.531.3.101 in my earlier reply, with the word 'individually' to at least try and indicate an issue.

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