Electrical – What size wire do I use

electrical

I need to run wire underground, in conduit to my chicken coop for two light bulbs, a fan, and in winter a oil-filled heater. What size wire do I use? It's on a 20 amp breaker. Approx distance from breaker box to chicken coop is 40 feet.

Best Answer

The wire size depends on the breaker. Since you did not provide the size of the heater I would suggest 20 amp breaker with #12 wire. #14 with a 15 amp breaker may be large enough if the heater is a small one under 1000w. You should use a GFCI outlet or breaker.