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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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    If insulation resistance testing used in periodic I+T was a commercial product, I would fear for it. The modern installation is full of electronic equipment and where there is global 30mA RCD protection, I simply wouldn’t bother. Sure you might need it in fault diagnosis but it just isn’t worth the effort in a standard periodic inspection where every circuit has RCBO protection. There are far more important things to attend to. I have a HSE document somewhere in which they refer to 30mA RCDs as effective insulation monitors.
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    If insulation resistance testing used in periodic I+T was a commercial product, I would fear for it. The modern installation is full of electronic equipment and where there is global 30mA RCD protection, I simply wouldn’t bother. Sure you might need it in fault diagnosis but it just isn’t worth the effort in a standard periodic inspection where every circuit has RCBO protection. There are far more important things to attend to. I have a HSE document somewhere in which they refer to 30mA RCDs as effective insulation monitors.
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