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RCBO's and IR testing

Jaymack
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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    I increasingly think that subject to a pass at 500 V on initial verification, a good result at 250 V will do for a periodic.


    These devices seem to make a whole-board IR test at 500 V impossible.


    My 17th+3 version of GN3 makes the point that functional earths should be disconnected and has a list of devices as long as your arm which are vulnerable to IR testing. It makes me wonder whether anybody will want to prepare reports for private landlords.


    And BTW, if an SRCD needs to be disconnected (as MK recommend) and two or more are fed from a ring, how do you IR test it? The same may apply to USB sockets.
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  • 0
    I increasingly think that subject to a pass at 500 V on initial verification, a good result at 250 V will do for a periodic.


    These devices seem to make a whole-board IR test at 500 V impossible.


    My 17th+3 version of GN3 makes the point that functional earths should be disconnected and has a list of devices as long as your arm which are vulnerable to IR testing. It makes me wonder whether anybody will want to prepare reports for private landlords.


    And BTW, if an SRCD needs to be disconnected (as MK recommend) and two or more are fed from a ring, how do you IR test it? The same may apply to USB sockets.
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