
Matthew Colak
Hi Terry, This is usually caused by previously installed additional wiring. The more than likely reason for this to occur is that someone has extended the original wiring by connecting another spur to an already spurred socket. This will work at lower currents but as soon as demand is applied ( the running machine motor ) it trips the breaker. This is because the demand is more than the breaker can handle and therefore will trip. Unfortunately this is something that can only be checked by someone qualified and experienced. To clarify if this is the problem run a extension from another socket and attempt the test again, the running machine will work perfectly ( unless either you managed to select another socket with the same issue or there is a more fundamental issue ). Kind regards, Matt