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RCD TESTING BS7671:2018+A2:2022

sparkiemike

Anybody notice the changes to 643.7.1 and 643.8 when it comes to RCD testing. In the note it says that "Regardless of the RCD type, effectiveness is deemed to have been verified where an RCD disconnects with in the time stated below with an alternating current test rated at residual operating current I△n"

So the minimum requirement is to set your instrument to RCD type AC and carry out the test even if you have a Type A or Type B RCD.

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  • Twenty years ago I was taught not to test RCDs rated at more than 30 mA at five times the test current, because it is not required and it would be at least half an amp (5 x 100 mA = half an amp) which too dangerous to put into the earthing system, I was also taught to do an earth loop impedance test before the RCD test to ensure the touch voltage would not be exceeded, particularly important in the days before test meters would abort the test if the touch voltage would be too high.

    So, going back to the original post, to test Electric Vehicle Supply Equipment we need a testing adapter to mimic an EV under charge to activate the output, but we can use a twenty year old RCD tester to test the RCD and don't actually need the very latest all singing and dancing tester that injects DC current?

    I wasn't sure if to put the question mark at the end of that paragraph, I think it is a statement rather than a question.

  • in reply to Sparkingchip

    I think that is correct, assuming the EVSE adaptors from the likes of Metrel, Megger, Kewtech etc can be used with any MFT. My trusty Fluke 1653B may still have a few more years left.

    Although I am sure the manufactures would rather we splashed out on a new "18th Edition" MFT and EVSE adapter as a set. 

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  • in reply to Sparkingchip

    I think that is correct, assuming the EVSE adaptors from the likes of Metrel, Megger, Kewtech etc can be used with any MFT. My trusty Fluke 1653B may still have a few more years left.

    Although I am sure the manufactures would rather we splashed out on a new "18th Edition" MFT and EVSE adapter as a set. 

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