Wire size for pumps

They are installed on 1 inch black plastic, or 1 inch galvanized pipe, or 1 inch solid plastic in 21 foot joints. Those on one inch black plastic use safety rope attached to pump. Tape with electrical tape every 5 feet the wire & safety rope. The lower clamps should be taped also. Wires should be crimped with crimping tool and heat shrink tube applied over connection. From the wire size vs. Current capacity table posted one can see that number 12 or number 10 are sufficient for 1/2 to 1 hp pumps. 1hp = 740 watt. P = V I