As lower gauge wires (such as AWG 4) are thicker, they can accommodate more electrons than higher gauge wires (such as AWG 40). Current capacity is a measure of the amount of current a wire can carry safely. 2485Ω for 1000 feet, while AWG 40 wire has a resistance of 1079Ω for 1000 feet.) (e.g., At 25° C, AWG 4 wire has a resistance of. Given two wires of the same length, the thicker wire would have smaller resistance than the thinner wire. ![]() Longer wires provide greater resistance than shorter wires. A wire’s electrical resistance depends on its length and thickness. (e.g., AWG 4 wire requires 7.918 feet, while AWG 40 requires 34.364 feet.) Feet per pound refers to the number of feet of wire needed to reach one pound in weight. The wire’s cross-sectional area doubles every time it descends three levels (e.g., a six-gauge wire has double the cross-sectional surface area of a nine-gauge wire). The cross-sectional area of round wires can be calculated using the formula A= πr2, with r representing half of the diameter. The diameter doubles every time the gauge decreases by six levels (e.g., a three-gauge wire has double the diameter of a nine-gauge wire). For example, AWG 4 is 0.2043 inches in diameter, and AWG 40 is. American Wire Gauge standards range from 0000 (which can handle up to 302 amps) to 40 (which can handle up to 0.0137 amps). ![]() Wire gauges range from low numbers to high numbers, with smaller numbers referring to smaller diameters and larger numbers representing larger diameters. Given its gauge, industry professionals can determine the following about a particular wire: ![]() The gauge of a wire imparts more than information about its thickness. Relationships Between Wire Gauge and Other Technical Specs
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