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EV Chargers with built in RCD and 537.2.2

Ian Cheek

I read 537.2.2, and wonder if this applies to our EV charge points which offer built in 30ma and 6ma DC RCD's. Im sure these RCD must be electronic in nature. 

Upstream is a traditional MCB, so the EV Charger could be isolated.

However looking at 411.3.2.1 it has the line "the protecticve device shall be suitable for isolation of at least the line conductor"

So as 411.3.2.1 uses the term isolation, and the RCD is a protective device, should the inbuilt RCD comply with 537.2.2?

I'll stop reading the regs and have a cup of T, Thank you for looking, and in advance of your advice.

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  • 0

    411.3.2 is about ADS - so in a TN system the protective device is likely to be the MCB, with any RCDs providing only additional protection, rather than ADS.

       - Andy.

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  • 0

    411.3.2 is about ADS - so in a TN system the protective device is likely to be the MCB, with any RCDs providing only additional protection, rather than ADS.

       - Andy.

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  • 0 in reply to AJJewsbury

    Thank you for your time in replying. I’m happy with the position of the RCD in the hierarchy of the installations regarding ADS, additional protection etc.

    More my questions is of the electronics. Electronic isolation can not be used, based on my experience with electronic isolation, in its off state, it is only off if it tries to pull current, you can often still measure the input voltage at the output when it is switch (driven) off.

    The device will have a let through current before its state is realised, although the let through current is very small.

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