These results are not unusual, you should always take readings...[as you did]HI all.I tested an RCD yesterday and got these results.
1/2x 300ms
1/2x 300ms
1x 203ms
1x 11ms
5x 11ms
5x 19ms
Could anyone tell me a reason why the 1st 1x delta test is so high?
Thanks
Malc
All I will say is that you only get one chance for the RCD to trip in the event of a fault!!These results are not unusual, you should always take readings...[as you did]at least two times.[i personally go for a third ]..usually on 180 degree Phase shift.....Sticky switching mechanisms problems are then eliminated.
Dont agree with that one NOZ ! Sometimes these RCDs have not been operated for years and after a couple of trip tests they are back to spec.All I will say is that you only get one chance for the RCD to trip in the event of a fault!!IMO.... if it doesn't trip the first time (within limits) then it's a fail
:coat
But in real life what is actually going to happen? If it's not tested and it doesn't disconnect in time someone could die.Dont agree with that one NOZ ! Sometimes these RCDs have not been operated for years and after a couple of trip tests they are back to spec.if people tested them Quarterly ,as recommended, then it wouldnt be a problem,in practice this doesnt happen ,but following the trip testing its back within spec as the test meter results verify .
but the problem being, in real life, RCD's should be tested regularly. which should avoid the problem of sticking. but people dont do this, so it may not operate when needed. what we need is an RCD that works like an MCB, in that it doesnt need tested (or open/closed) oftenBut in real life what is actually going to happen? If it's not tested and it doesn't disconnect in time someone could die.
This is why I am not happy with the 17th edition regs being so heavily reliant on RCD's and less reliant on supplementary bonding.but the problem being, in real life, RCD's should be tested regularly. which should avoid the problem of sticking. but people dont do this, so it may not operate when needed. what we need is an RCD that works like an MCB, in that it doesnt need tested (or open/closed) often
Who says mcb don't fail the only reason we know rcd fail because we can test them with meters and a test button, how do we test mcb's we don't we just hope they workbut the problem being, in real life, RCD's should be tested regularly. which should avoid the problem of sticking. but people don't do this, so it may not operate when needed. what we need is an RCD that works like an MCB, in that it doesn't need tested (or open/closed) often
I will just apply my 50amp short circuit tester cable across the shower circuit....i dont think DNO would be happy with us testing MCB's!
ill just add to that.....I will just apply my 50amp short circuit tester cable across the shower circuit....Boom, flash, spark!!!! :^O:^O:^O:^O
Dont agree with that one NOZ ! Sometimes these RCDs have not been operated for years and after a couple of trip tests they are back to spec.if people tested them Quarterly ,as recommended, then it wouldnt be a problem,in practice this doesnt happen ,but following the trip testing its back within spec as the test meter results verify .
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