Some good comments here.
What I would be thinking of in terms of using MCB's as the isolation point in the circuit, with the continued switching of the MCB cause it's primary function to be lessened?.
It is switching under the full load of the circuit, where as a functional switch usually only switches a portion of the load on that particular MCB.
As far as E-lighting goes, it is supposed to be fed from it's own MCB that is taken straight off of the Main Switch and is it's own dedicated circuit.
Mind you, the number of times I've inspected the E-lights at Commercial premises (pubs mainly) and found the Batteries flat because the MCB had tripped and no-one ever noticed it would suggest that a lot of owners have little knowledge or just don't care about those that use thier facilities.
We had a fire in a 3-Phase pillar box here outside a pub about 3 years ago.
The E-lighting never even attempted to start, mainly because some upon investigation, some idiot had replaced the MCB for the circuit, but had installed it upside down and had left it OFF, basic testing would have found that fault.
But what a bloody panic that was, getting 200 drunken kids out of a dark pub at 2 in the morning.
Those that didn't want to have a fight with us FF's, were trying to find thier way out, with little success.
