The weight per unit length diminishes by an average of approximately 20% at each step. The system as a whole approximates an exponential curve, plotting diameter against gauge-number (each size is a approximately a constant multiple of the previous size). The wire diameter diminishes with increasing size number. Sizes are specified as wire diameters, stated in thou and tenths of a thou (mils and tenths). The basis of the system is the thou (or mil in US English), or 0.001 in. SWG is not to be confused with American wire gauge, which has a similar but not interchangeable numbering scheme.Ī table of the gauge numbers and wire diameters is shown below. It was made a legal standard on 1 March, 1884, by the British Board of Trade. It was constructed by improving the Birmingham Wire Gauge. SWG was fixed by Order of Council August 23, 1883. The current British Standard for metallic materials such as wire and sheet is BS 6722:1986, which is a solely metric standard. Cross sectional area in square millimetres is now the more usual size measurement for wires used in electrical installation cables. Use of SWG sizes has fallen greatly in popularity, but they are still used as a measure of thickness in guitar strings and some electrical wire. It is also known as the Imperial Wire Gauge or British Standard Gauge. Imperial unit for wire diameters, as defined in British Standard 3737 A standard wire gaugeīritish Standard Wire Gauge (often abbreviated to Standard Wire Gauge or SWG) is a unit for denoting wire size given by BS 3737:1964 (now withdrawn).
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