Unless you intend to run 10 kilowatts of RF power, try to completely forget
all about your hopelessly imagined problems. Don't lose any sleep. Just use
ordinary electric wires and cables and run them wherever you fancy. Just
like domestic 110-volt power cables.

I've been running 100 watts over 20-gauge plastic insulated wire through
1/8" holes in dry, inflammable, wooden window frames for nigh on 25 years
and never yet burned the house down.