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The wire size is dependent upon the load current. Different size wires have a maximum safety capacity e.g. #14 - 15 amps, #12 - 20 amps. Over current on the wire could cause the insulation to fail so the current must remain within the wire specifications For 110v devices:

Depends on what you are wanting it to power. Lighting is normally 14/2 since it takes a lot of 60 watt bulbs to get to the 1800 watts off a 15 amp breaker. 12/2 for receptacles that will need more power because you can get 2400 watts from the 20 amp breaker.

Once you move to the 220v devices, you get to the */3 wire. Check the power requirements of the device to determine the gauge needed.

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16y ago

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