To clarify the subject text I am looking at a situation similar to upstairs/downstairs lighting rings and landing light feed. It is common practice to have the upstairs landing land controlled and powered from the downstairs lighting circuit. But this is counter intuitive for the electrician
ie he would normally expect that tripping the breaker for the upstairs lighting would make all upstairs lighting safe to work on. It is only the fact that this lighting arrangement is common place that seems to make it accepted practice.
So my question is:
I am considering putting the kitchen on a separate feed to lighten the load on the downstairs light circuit. But I intend to have one gang of a four gang switch in the kitchen controlling the dining room light, powered from the general downstairs circuit. So, isolating the kitchen feed will not make this switch safe.
Any suggestions on usual protocol in this case? Is it a problem? This lot will have to pass Part P muster of course.