For a given current, you can use the noted resistance and apply Ohms Law to calculate the voltage drop across the conductor.Ĭurrent (ampacity) Notes: The current ratings shown in the table are for power transmission and have been determined using the rule of 1 amp per 700 circular mils, which is a very conservative rating. Resistance Notes: The resistance noted in the table above is for copper wire conductor. The general rule of thumb is for every 6 gauge decrease the wire diameter doubles and every 3 gauge decrease doubles the cross sectional area.ĭiameter Notes: A mil is a unit of length equal to 0.001 inch (a "milli-inch" or a "thousandth of one inch") ie. A detailed description of each conductor property is described below Table 1.ĪWG Notes: American Wire Gauge (AWG) is a standardized wire gauge system used predominantly in the United States to note the diameter of electrically conducting wire. The resistances and skin depth noted are for copper conductors. In addition to wire size, the table provides values load (current) carrying capacity, resistance and skin effects. Table 1 lists the AWG sizes for electrical cables / conductors. American Wire Gauge (AWG) Sizes and Properties Chart / Table Note - W&M Wire Gauge, US Steel Wire Gauge and Music Wire Gauge are different systems. AWG general rules of thumb - for every 6 gauge decrease, the wire diameter doubles and for every 3 gauge decrease, the cross sectional area doubles. The smallest AWG size is 40 and the largest is 0000 (4/0). The larger the AWG number or wire guage, the smaller the physical size of the wire. American wire gauge (AWG) is a standardized wire gauge system for the diameters of round, solid, nonferrous, electrically conducting wire.
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