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RCBO's and IR testing

I have had a problem with 5 off Wylex RCBO's. These were bought by a houseowner and fitted by him as there was no RCD protection for some circuits requiring such. These Wylex RCBO's have a warning hidden on the body that connections should be disconnected for Insulation Testing ..........too late the man cried!. For expediency and availability, I have redesigned the arrangement to have MCB's with a common RCBO as a M.S..

I have been in contact with Wylex technical help, who say that they should have been OK to withstand 250V IR testing as in this case, but to return them to the dealer. Anyone else have had similar problems?


Jaymack .
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  • there is not, but the internal electronics is powered from the load side - if it was not, it would be in an effectivly unfused supply.

    However, I too am surprised it cannot stand a short flight to 500VDC, as it is supposed to take mains all day, and surges of a few kV.

    It is a bit of an oversight in the product spec that connection of test gear was not foreseen and put on the list of things to test and must survive.

    Equally I think surviving 400VAC from a lost neutral event should also be there in the list of approved tests, but it seems that too isn't.
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  • there is not, but the internal electronics is powered from the load side - if it was not, it would be in an effectivly unfused supply.

    However, I too am surprised it cannot stand a short flight to 500VDC, as it is supposed to take mains all day, and surges of a few kV.

    It is a bit of an oversight in the product spec that connection of test gear was not foreseen and put on the list of things to test and must survive.

    Equally I think surviving 400VAC from a lost neutral event should also be there in the list of approved tests, but it seems that too isn't.
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