Here's a puzzling situation for you - can anyone explain this ?
I have a shop vac in the attic above the bench, it has a slave start built in and I have an extension lead to a socket on the bench from the slave start socket on the vac. It all works fine. Except that one morning, when using the jig saw, the vac didnt start. So, I started some simple checks to eliminate the obvious and sure enough it worked fine with other tools.
So what's different about the jigsaw ? Eventually tracked it down to this - the jigsaw is an old Bosch, double insulated, so no earth lead, and fitted with a two pin plug. If I put the plug into the socket one way round, the vac starts. If I take the plug out out and put it back the opposite way round, the vac doesnt start. There is no earth leakage - or at least nothing that trips the very sensitive earth leakage breaker in the main distribution board.
I cant explain it - anyone else care to try ?