6 gauge wiring thru floor joists (qty)
I am currently preparing a wiring project for a Tankless On-demand Water Heater which requires (2) 60 amp 220 volt circuits with 6 gauge wiring. I ran both lines thru the same holes in the floor joists for about 20 feet. Both lines fit, however it was tight. Is this safe or should I bore another series of holes and run each line seperately.