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PhilB
Hi, My name is Phil and I am based in Warwickshire, whilst I have many years of experience in the electrical industry I have recently come across a problem that I cannot recall seeing before. I installed some new fluorescent fittings in the local community hall and upon carrying out a Zs reading on the said lighting circuit the 30mA triple pole & neutral Wylex RCD fitted at source by another electrician (nobody at the hall recalls who it was) operates.
My meter is a Di-Log 9083P and is fully calibrated and puts 15mA through the circuit on a Zs test therefore the RCD should not operate. It also operates if I plug the 13amp plug lead into any random socket outlet and carry out the same test. Would this signify a fault within the RCD itself or am I over looking something staring me in the face?
When it does trip it cannot be reset for a bout 5 to 10 minutes even if the main isolator is switched off. Also being commercial does an RCD have to be fitted at source? There are members of the public using the hall & the kitchen at various times, most of the installation is in surface steel conduit with some of it buried into the walls. There are also various incidents of random nuisance tripping but this is very difficult to investigate as we all know.
Many thanks for any help/suggestions on this matter
My meter is a Di-Log 9083P and is fully calibrated and puts 15mA through the circuit on a Zs test therefore the RCD should not operate. It also operates if I plug the 13amp plug lead into any random socket outlet and carry out the same test. Would this signify a fault within the RCD itself or am I over looking something staring me in the face?
When it does trip it cannot be reset for a bout 5 to 10 minutes even if the main isolator is switched off. Also being commercial does an RCD have to be fitted at source? There are members of the public using the hall & the kitchen at various times, most of the installation is in surface steel conduit with some of it buried into the walls. There are also various incidents of random nuisance tripping but this is very difficult to investigate as we all know.
Many thanks for any help/suggestions on this matter