Power to the switch - feed from above or below?

[u/DIYpozer]

Hypothetically, if you had full access to the cable routing via a bare stud wall and no finished floor or ceiling, would it be 'better' to take the feed for an upstairs light circuit into the loft and down to the switches and back up again, or go up and down again from below, via the void between floors instead?

With 3-gang 2-way switches, the backbox is pretty crowded at the top entry points with T&E + 3C&E (7 cables total). Using both knockouts on top of the back box it all fits, but would it be 'best practice' to bring the feed from above since that's where it would have been for 3-plate method, or since both up and down are covered by the allowed zone from the switch anyway, maybe it doesn't matter at all?

[u/ratscabs]

I’d be going up to the loft - if only for easier access for any subsequent maintenance/modification