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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
    You have to remove all the plugs and lamps to do the test. Otherwise you are not testing the fixed wiring installation at all, you are testing appliances. That has always been the case and is nothing new. The new part are the allegedly mains powered things added to the fixed wiring preventing it being tested properly. Why anyone would buy one of those "USB" sockets is beyond me. USB is the data not the 5V supply, so why call them USB sockets. Crazy. The 5v chargers I have are easily unplugged for testing. The point of the insulation test is being lost as I said, it is to check for gaps of less than 1-2mm between live conductors, or lives to Earth. Do you PAT test at 500V? I do and found a faulty kettle only last week. Worked fine on 250V test, but still dangerous in my view, particularly as the cordless connector Earth connection was also intermittent. It could be a life saved, so PROPER testing is important.
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  • 0
    You have to remove all the plugs and lamps to do the test. Otherwise you are not testing the fixed wiring installation at all, you are testing appliances. That has always been the case and is nothing new. The new part are the allegedly mains powered things added to the fixed wiring preventing it being tested properly. Why anyone would buy one of those "USB" sockets is beyond me. USB is the data not the 5V supply, so why call them USB sockets. Crazy. The 5v chargers I have are easily unplugged for testing. The point of the insulation test is being lost as I said, it is to check for gaps of less than 1-2mm between live conductors, or lives to Earth. Do you PAT test at 500V? I do and found a faulty kettle only last week. Worked fine on 250V test, but still dangerous in my view, particularly as the cordless connector Earth connection was also intermittent. It could be a life saved, so PROPER testing is important.
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