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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 .
  • 0

    lyledunn:

    I have great respect and admiration for you Zoom but there is a tad more heft in HSE utterances! 




    Hello Lyle,

                      thanks mate. Could we not apply the principle of use of R.C.M.s as mentioned in 651.2 after Note 2. Where a circuit is permanently monitored by an RCM or an IMD it is not necessary to measure the installation resistance if (the device) is correct. Do we really need to insulation resistance test cables if an R.C.D. is protecting them?




    Z.

  • 0
    Some time back we played a 'what if' exercise on the old forum, to see what you would or would not bother testing, if you were only allowed one test before switch on.

    I think we agreed then that Zs would  win - the test, not the forum member, as all other faults posed little or no risk, or would most likley reveal themselves on energisation anyway.

    Polarity came a close second, but I guess with DP breaking RCBOs it is less of an issue. Insulation was further down the list.

    Insulation tests come into their own when the installation has already been made been dead for some reason, such as new work being added or a fault tripping something.

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