Just as I arrived at a customers house there was a power cut because the DNO was working on a substation near by. It wasn't expected back on until midnight tonight meaning that I could only do dead tests.
When the power cut the main RCD in his CU also tripped and it was quite difficult to get it back to the on position. I am aware you can get latching RCD's in plug sockets but not normally in domestic CU's.
This leaves me wondering if the lack of power on the supply side or maybe some disturbance on the lines was making the RCD difficult to set or if I had a faulty RCD and need to start hunting down an RCD for my return trip.
There was a single RCD protecting all circuits and switching all the circuits off made no difference. I am assuming it doesn't change the operation of an RCD but the CU was mounted upside down.
Welcome your thoughts
Thanks
Alan
