Hi, I've just had a bathroom refurbishment done which included moving an LED mirror from one wall to another. I've just discovered that the electrician has wired it into the downstairs lighting circuit. This means that when all upstairs circuits are switched off at the consumer unit the mirror is still live. The mirror was originally on the same circuit as the bathroom lights.
Every installation shall be divided into circuits, as necessary, to: (i) avoid hazards and minimize inconvenience in the event of a fault (ii) facilitate safe inspection, testing and maintenance (see also Section 537) (iii) take account of danger that may arise from the failure of a single circuit such as a lighting circuit (iv) reduce the possibility of unwanted tripping of RCDs due to excessive protective conductor currents produced by equipment in normal operation (v) mitigate the effects of electromagnetic interferences (EMI) (vi) prevent the indirect energizing of a circuit intended to be isolated.
There is nothing really in that list that says you should not mix floors, in fact when using two ring final circuits, side to side split works better than up/down.
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