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Red to black · 16th Sep 2018, 3:52 pm

Hi again Al
just a heads up, a typical 30mA rcd should not trip at 1/2 IdN (I delta N ie,its nominal trip rating) @15mA, it should trip in less than 300 ms at its rated IdN 30mA, on both half cycles, they are polarity sensitive wrt to trip times, under the 17th ed regs they should trip in less that 40 ms at X5 IdN 150mA at both half cycles, although the 18th Ed has removed the requirement to test at 5 XIdN.
I found by ramp testing they usually trip at about the 22mA mark when functioning correctly.

Edit: they can theoretically trip any where above 1/2IdN and X1 IdN, although in reality they tend to trip at about the 22 to 23mA mark This is of course at the usual nominal 230V rating

16th Sep 2018, 3:52 pm	#31
Red to black Nonode Join Date: Mar 2010 Location: Sunderland, Tyne and Wear, UK. Posts: 2,475	Re: Lamp limiter plus Variac tip Hi again Al just a heads up, a typical 30mA rcd should not trip at 1/2 IdN (I delta N ie,its nominal trip rating) @15mA, it should trip in less than 300 ms at its rated IdN 30mA, on both half cycles, they are polarity sensitive wrt to trip times, under the 17th ed regs they should trip in less that 40 ms at X5 IdN 150mA at both half cycles, although the 18th Ed has removed the requirement to test at 5 XIdN. I found by ramp testing they usually trip at about the 22mA mark when functioning correctly. Edit: they can theoretically trip any where above 1/2IdN and X1 IdN, although in reality they tend to trip at about the 22 to 23mA mark This is of course at the usual nominal 230V rating __________________ I don't suffer from Insanity. I enjoy every minute of it. Last edited by Red to black; 16th Sep 2018 at 4:09 pm.