Swimbo wanted a new decor light switch. I switched off the circuit at the breaker board. While changing the switch I touched the live to either the neutral or ground with a pliers. There was a good flash with sparks. I did not believe this. I put a meter across the live and ground (and neutral). All volts were zero. I tested again by connecting the live to the neutral or earth with the pliers. No effect this time.
So what gives? How can a residual voltage be contained in a circuit disconnected at the breaker?
I completed replacing the switch, switched on the breaker and everything works ok.
Peter.