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There are zero amps in 220 wire. When you talk of 220 wire you are making reference to the insulation factor of the wire. Wire in North America is rated for insulation in increments of 300, 600 and 1000 volts. For special applications 5000 volts still has insulation on it. Then there is 7500 volt cable that is classified as concentric neutral cable which is used mostly for underground primary installations. Any voltages higher than that is bare wire. For high voltage installations it is called ACSR. Aluminium Conductor Steel Reinforced. This type of cable uses a steel center support wire and the aluminium conductors are wound around the steel to carry the amperage. This combination of steel and aluminium allow the wire to be spaced over long distances between poles or towers.

The amperage classification of wire is based on the circular diameter of the wire. The larger the diameter of the wire the higher the amperage capacity.

Three equations to find amps when two factors are known are; Amps = Watts/Volts, Amps = Volts/Resistance and Amps = the sq. root of Watts/Resistance.

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