Posted by Philip Doolittle on July 15, 2010 at 18:56:10 from (96.248.140.82):
In Reply to: Big enough wire? posted by OT. Electrical question on July 15, 2010 at 09:34:52:
The Nat Elec. Code requires you to disconnect BOTH energized or hot wires if you run a 3 wire + Gnd circuit so as not to have a HOT wire/leg in the terminal box or panel if you have a overcurrent problem on one leg. This means you must use a TWO (2) pole breaker at the supply OR a 2 pole FUSED swtch. If you do use fuses you will gain the advantage (recommended) of being able to have light on one leg(ckt.) and motor on the other leg (ckt.),so if the motor has an electrical problem the lights will stay ON. #10 wire would be the size to use. Type UF/3 conductor with a ground is best for buried runs as the best buried conduits will eventually get water in them. I would also point out that a 2 pole Ground fault circuit breaker (GFCI) will probally be required at the "LOAD" end depending on the structure/use. "THATS FOR YOUR SAFETY " in case of a ground fault that could shock and electrocute YOU.Feel free to ask any questions.
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