Either - whichever take syour fancy - turning the whole distribution board off may/will affect heating and freezer etc
The key thing for your safety is to test and be sure - have the light you wish to tamper with switched on - throw the appropriate MCB and observe that the light has gone out - double check with a test device if you have one and if not - the light going out is a pretty sure sign that the mains power has been removed.
An MCB in the down position is just like a removed fuse.
Take care...
Peccavi
March 2010
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