Recommended AWG for 60 AMP Circuit

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  #1  
Old 03-02-12, 08:57 AM
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Recommended AWG for 60 AMP Circuit

I want to run a new 60 amp circuit for a hot tub. The Maximum Current Draw (according to the manufacturer) is 48 amps. The run is about 100 feet. I was thinking of running four 6 AWG THHN wires in a 3/4" EMT conduit (2 hots, 1 neutral, and 1 ground). The run will start at the circuit panel and terminate at the outdoor GFCI, which will then run about 10 feet to the hot tub.

Is 6 AWG THHN large enough, or should I go with 4 AWG THHN in 1" EMT?

Thanks in advance.
 
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Old 03-02-12, 02:31 PM
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Number 6 copper should be fine. Voltage drop will be under 2%, about 4.6 volts. Be sure that the conductors are rated THHN/THWN rather than just THHN. The W means weatherproof and is necessary whenever conduit is buried or located outside.
 
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Old 03-02-12, 06:02 PM
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I was thinking of running four 6 AWG THHN wires in a 3/4" EMT conduit (2 hots, 1 neutral, and 1 ground). The run will start at the circuit panel and terminate at the outdoor GFCI, which will then run about 10 feet to the hot tub.
All you need is a #10 ground conductor for a 60 amp circuit. Once your conduit goes outside, use compression connectors and couplings to keep the conduit raintight. If the conduit is to go underground, convert to PVC schedule 40 for that part of the run.
 
  #4  
Old 03-02-12, 09:15 PM
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I would use at least 1", maybe 1-1/4". It's a lot easier than using all that lube and trying to get through any bends and push slack through conduit bodies.
 
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