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The formula for calculating cable size for single phase circuits is wire circular mils = (conductor resistivity)(2)(amps)(one way distance in feet) / allowable voltage drop. This formula is based on Ohm's Law.How do you calculate conductor size?
The formula for calculating the size of conductors for direct currents, where the length, load, and loss in volts are given, is as follows: The size of conductor (in circular mils) is equal to the current multiplied by the distance (one way) multiplied by 21.6, divided by the loss in volts; or, CM= C X D X 21.6.(1)What are the different gauges of wire?
There are many different thicknesses of jewelry wire, and the sizes are distinguished by a measuring system where the thickness of the wire is referred to as the ‘gauge’. Ear wires, jump rings, headpins, and other items made from wire are also described by their gauges.What size wire for 120V?
Household wiring for 120-V circuits is almost always 12- or 14-gauge copper wire, depending on the current load and length of the circuit. The diameter of the metal conductor in a 12-gauge copper wire is 0.0808 inches; of a 14-gauge wire is 0.0641 inches.