Does it seem sensible to anyone here that a 63A 230V (UK) isolator switch is padlocked in its 'ON' position?! It feeds through to a MCB panel, which then goes through to dimmers. Personally, although the MCB panel can be used to isolate power, I would rather use the isolator switch as I feel happier with that as a complete isolate of power, as to my knowledge some of these MCB panels only isolate the live wires. There are plenty of good reasons for locking the isolator when it is 'OFF' but not when it is 'ON'. This is a school I'm talking about, but there are no kids near the dimmers when they are in operation. It wouldn't be to stop them turning them off anyway, as they could just use the MCB panel. Personally, I refuse to use the equipment if it is locked in the 'ON' position and if I find myself in a situation where I have no time to rectify the situation, I have no hesitation in taking a pair of boltcutters to the padlock. Any others thoughts on this??