What size wire for 110 ft 220 volt 15 amp?

Answer 1

A 12 AWG wire would give you approximately 2.6 percent drop, which is less than the maximum allowable voltage drop. 14 AWG would drop you 10 volts (4.2 percent), which is still workable until you factor in the 80 percent design factor (i.e., you are only allowed to run a circuit at 80 percent of its design capacity).

If you REALLY need 15 amps, you have to design for 18.75 amps (which works out to a 14 AWG voltage drop of over 5 percent, which is not allowed), so you would need to use the larger wire (12 AWG) for a 3.3 percent drop.

Answer 2

More information is needed. The voltage and current that are required will have a significant effect on the wire size needed. In general a higher current requires thicker wire.

If the voltage is higher, e.g. 240 v instead of 120 v, the current drawn will be less for a given kilowatt load and that allows thinner wire.

Answer 3

First calculate the voltage drop allowed: 5% of 220 v is 11 v. Divide by the current to find the resistance: 11/25 is 0.44 ohms.

The total wire length is 500 ft or 152.4 metres so the resistance allowed per metre is 0.44/152.5 or 0.00288 ohms/m.

Copper wire of 1 mm2 is 0.0168 ohms per metre so the wire size required is a minimum of 0.0168/0.00288 mm2, which is 5.82 mm2. Therefore 6 mm2 cable should be used and this size of cable is a common one in Europe. The nearest suitable AWG size is #9 but #8 is probably commoner.

Answer 4

It is more important to know what the amps that are going to be required. That will determine what gauge wire to use.