I just love Fault finding , tripping lighting MCB , RCD tripping , open circuit on ring mains , low insulation , High Zs reading, motors humming 3 phase , machines inoperative ,
one of the most common is a lighting mcb tripping , normally this is caused by posh lights with burnt out wiring shorting , other faults i have found low IR tripping RCD , fault was caused by young lad peeing over socket , tripping RCD , extension lead in garden powering pond pump had got wet , tripping RCD , out side light full of water , Fire alarms continuosly sounding even after reset , cause burst pipe flooding detector ( shop totally flooded £250,000 worth of damage ouch) tripping MCB , fault located to Rodent attack Dead squirrel found across cables , Tripping MCB fault due to burnt out connector (originally a posted thread ) open circuit on ring main ,cause cable chopped in half then plastered ove
just a few ive come across over the years best one was a call out to no power , this was caused initially by a power cut , but when the power came on still no power , main fuse blown fault traced to a light in an elderly gentlmans lounge , it kept blowing fuses so he wrapped the fuse with 30 amp fuse wire , which in turn blew the 30 amp rewirable fuse which he then wrapped in 30 ap fuse wire which then blem the main fuse , fault was a faulty light fitting testing revealed a low IR reading on the ring circuits , cable was melted probably caused by incorrect fuse wire in fuse , and one reason to reccomend replacing rewirable boards to MCB's
