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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.

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    How long is the run? How much current/wattage does each device draw? What size breaker is protecting the circuit? Are you planning to run a single circuit (maybe a multi-wire branch circuit), or do you want to install a distribution panel at the chicken coop? – Tester101 Aug 26 '16 at 18:01
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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.

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