The ratio of these diameters is 1:92, and there are 40 gauge sizes from No. 36 to No. 0000, or 39 steps. 36 AWG is 0.005 inches in diameter, and No. 0000 is 0.46 inches in diameter. Because there are also small gaps between the strands, a stranded wire will always have a slightly larger overall diameter than a solid wire with the same AWG.ĪWG is also commonly used to specify body piercing jewelry sizes (especially smaller sizes), even when the material is not metallic. The AWG of a stranded wire is determined by the cross-sectional area of the equivalent solid conductor. The AWG tables are for a single, solid and round conductor. Manufacturers of wire formerly had proprietary wire gauge systems the development of standardized wire gauges rationalized selection of wire for a particular purpose. Very fine wire (for example, 30 gauge) required more passes through the drawing dies than 0 gauge wire did. This gauge system originated in the number of drawing operations used to produce a given gauge of wire. Increasing gauge numbers denote decreasing wire diameters, which is similar to many other non-metric gauging systems such as British Standard Wire Gauge (SWG), but unlike IEC 60228, the metric wire-size standard used in most parts of the world. The cross-sectional area of each gauge is an important factor for determining its current-carrying ampacity. Dimensions of the wires are given in ASTM standard B 258. For other uses, see AWG (disambiguation).Īmerican Wire Gauge ( AWG), also known as the Brown & Sharpe wire gauge, is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous, electrically conducting wire.
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