I am running a long 20 amp circuit out to a stock watering tank from the barn. Given the length of the run (280 ft), I will need to use 4AWG. Midway, I will place a junction box and have an outlet pigtailed from the junction box as well as an outlet at the end of circuit.
What size and type of junction box should I have? The wire will run in buried plastic conduit and the junction box will be mounted outdoors. Both conduits will enter the box from the bottom (one conduit to barn, one to the end of the circuit at the stock tank).