Hello all wonder if you can help. I looked at a lighting system today and when i went to turn off the supply to it via a 6a c.b it didnt turn off. I tried the next breaker in line and still didnt turn off. It was not until i turned off both breakers that the circuit went dead?? it seems to be connected to both breakers somehow. would this be because one of the wires in the circuit is cross connected to both up and downstairs lighting loops??