The standard ASTM B258-02 (2008), Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors, defines the ratio between successive sizes to be the 39th root of 92, or approximately 1.1229322. Any two successive gauges (e.g., A and B ) have diameters whose ratio (dia. Because each successive gauge number increases cross sectional area by a constant multiple, diameters vary geometrically. 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.īy definition, No. 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. However, AWG is dissimilar to IEC 60228, the metric wire-size standard used in most parts of the world, based directly on the wire cross-section area (in square millimetres, mm²). Increasing gauge numbers denote logarithmically decreasing wire diameters, which is similar to many other non-metric gauging systems such as British Standard Wire Gauge (SWG). These are functionally interchangeable but the use of B&S in relation to wire gauges, rather than sheet metal gauges, is technically improper. While the AWG is essentially identical to the Brown & Sharpe (B&S) sheet metal gauge, the B&S gauge was designed for use with sheet metals as its name suggests. 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. The AWG originated in the number of drawing operations used to produce a given gauge of wire. The cross-sectional area of each gauge is an important factor for determining its current-carrying capacity.ĪWG is also commonly used to specify body piercing jewelry sizes (especially smaller sizes), even when the material is not metallic. Dimensions of the wires are given in ASTM standard B 258. For other uses, see AWG (disambiguation).Īmerican Wire Gauge ( AWG) 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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