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Now I fitted a couple of Wylex 32 amp RCBO's a couple of years back on a Kitchen upgrade. One for extra sockets and points for machines and the other a cooker circuit. I got called out as the socket circuit has been intermittently tripping out.
So went to have a look. Machines had only just been tested before people moved in (this is a let house) they had passed. While I was there I tested RCBO's and they also passed OK with no problems. This was done with MFT and not just test button. Tenant had supplied there own washing machine, so first thoughts WM must be this causing problems. I do insulation test with everything on and tests comes out just under 10 megohm. Now to me this is no way low enough to trip RCBO. I think maybe washing machine when its on for a bit that is when its getting faulty IE insulation breaking down but not sure. With everything connected apart from washing machine circuit is >299 megohm. So I try a few things and suddenly trip trips, washing machine is switched off (double pole socket)At this point I have probably been there for an hour.
I decide to change RCBO although it has tested out perfect. Put everything back on and no tripping. Now there is quite a bit on circuit but no way 32 amps. The RCBO is around the same time as the recall MCB's. It seems strange an RCBO should trip without a fault. My worry is it may not be just the faulty MCB's and possibly more gear is affected.
So went to have a look. Machines had only just been tested before people moved in (this is a let house) they had passed. While I was there I tested RCBO's and they also passed OK with no problems. This was done with MFT and not just test button. Tenant had supplied there own washing machine, so first thoughts WM must be this causing problems. I do insulation test with everything on and tests comes out just under 10 megohm. Now to me this is no way low enough to trip RCBO. I think maybe washing machine when its on for a bit that is when its getting faulty IE insulation breaking down but not sure. With everything connected apart from washing machine circuit is >299 megohm. So I try a few things and suddenly trip trips, washing machine is switched off (double pole socket)At this point I have probably been there for an hour.
I decide to change RCBO although it has tested out perfect. Put everything back on and no tripping. Now there is quite a bit on circuit but no way 32 amps. The RCBO is around the same time as the recall MCB's. It seems strange an RCBO should trip without a fault. My worry is it may not be just the faulty MCB's and possibly more gear is affected.