It is rated at 20 amps. Code states that conductors should only be loaded to 80% so continuous load will be 20 x .8 = 16amps
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NEC recommends maximum allowable voltage drops not to exceed 3% on a branch circuit. For feeder/ branch combos the NEC recommends that the voltage shall not drop by more than 5% to the furthest outlet. The main consideration that is enforced is NEC 250-122. You must compensate your grounding conductor when you increase in conductor size to compensate for voltage drops. Direct bury or conduit: #4/0 copper provides for 2.95% #2/0 copper provides for 4.35% #1/0 copper provides for 5.19% Interestingly enough, using a separate calculator 3/0 copper with 3% voltage drop can be 780.5 feet long.