We're planning to install some area lights in the farm yard, and want to be able to turn them on from the house. This is simple enough with normal house switches, but I'm concerned that the overall distances are going to cause problems with wire resistance. We're looking at a total circuit length in the hundreds of meters range, probably with 20A @ 110V worth of total lighting, let alone the wire load. Should I be concerned? Is there a commercially-available switch solution that I can readily employ? What do large facilities do for this sort of thing?
I know a fair amount about residential electrical wiring, but I'm no electrician.