1 # 10 hot
1 # 12 neutral
1#12 ground
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For a 250-foot run, it is recommended to use a wire gauge that is appropriate for the electrical load and voltage requirements of the circuit. Typically, for longer runs like this, a thicker gauge wire such as 10 AWG or 12 AWG may be used to minimize voltage drop and ensure proper current flow. It is important to consult local electrical codes and regulations to determine the specific wire type and gauge suitable for your application.
It is not recommended to run a 230 volt 20 amp table saw on a 10/3 wire with a 250-foot run. A longer wire run may result in voltage drop that could potentially damage the saw or cause it to operate inefficiently. It is advisable to consult with an electrician to determine the appropriate wire size for the distance involved.
For a 200 amp service with a 60 foot run, it is recommended to use 3/0 AWG copper wire or 250 kcmil aluminum wire to ensure proper voltage drop and capacity for the load. Be sure to consult with local codes and a licensed electrician for specific requirements and installation guidance.
#10 cable is no good for 120 amps, you need #2 cable, and it can be used at a distance of 250 ft.
For a 5% volt drop of 6 volts the total resistance should be less than 6/8 ohms, 0.75 ohms, which for a total wire run of 500 ft is equivalent to 1.5 ohms per 1000 ft. Wire tables show that a #10 cable should be used. A #12 cable would give a volt drop of 5.3% which would probably be acceptable for occasional use and easier to store.
For an 80 amp breaker with a one hundred foot run, you would typically need to use 4 AWG copper wire to minimize voltage drop and ensure safe operation of the circuit. It is important to consult with a qualified electrician to determine the specific requirements for your installation based on local codes and conditions.