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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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  • 0
    What happened to the RCBOs?


    In a way I'd expect them to survive - after all (looking at table 443.2) they should be able to withstand a 4kV pulse - so 500V should be fine (at least for a short duration). If they failed on a 250V d.c. test I can't imagine how they'd work in service where a 230V r.m.s. waveform peaks at over 325V.


    Sure most need disconnecting (a few sensible designs notwithstanding) - but for reasons of not causing false failures of the test rather than (I'd hope) risking the RCBO itself.


      - Andy.
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  • 0
    What happened to the RCBOs?


    In a way I'd expect them to survive - after all (looking at table 443.2) they should be able to withstand a 4kV pulse - so 500V should be fine (at least for a short duration). If they failed on a 250V d.c. test I can't imagine how they'd work in service where a 230V r.m.s. waveform peaks at over 325V.


    Sure most need disconnecting (a few sensible designs notwithstanding) - but for reasons of not causing false failures of the test rather than (I'd hope) risking the RCBO itself.


      - Andy.
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