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'''British Standard Wire Gauge''' ('''SWG''') is a set of wire sizes given by [[British_Standards|BS]] 3737:1964 (now withdrawn), and is generally abbreviated to SWG. It is also known as: '''Imperial Wire Gauge''' or '''British Standard Gauge'''. Use of SWG sizes has fallen greatly in popularity, but is still used as a measure of thickness in guitar strings and some electrical wire. Cross sectional area in square millimetres is now a more popular size measurement. The current British Standard for metallic materials such as wire and sheet is BS 6722:1986, which is a solely metric standard. [[American wire gauge]] (AWG) is a similar but not quite equivalent numbering scheme.▼
[[Image:Wire gauge (PSF).png|thumb|A standard wire gauge.]]
▲'''British Standard Wire Gauge''' is a set of wire sizes given by [[British_Standards|BS]] 3737:1964 (now withdrawn), and is generally abbreviated to SWG. It is also known as: '''Imperial Wire Gauge''' or '''British Standard Gauge'''. Use of SWG sizes has fallen greatly in popularity, but is still used as a measure of thickness in guitar strings and some electrical wire. Cross sectional area in square millimetres is now a more popular size measurement. The current British Standard for metallic materials such as wire and sheet is BS 6722:1986, which is a solely metric standard.
 
The basis of the system is the ''[[thou]]'' or ''mil'' in US English which is 0.001 inch and is different to the millimetre (mm). No. 7/0, the largest size, is 0.50 inch, 500 thou or 12.7 mm in diameter, and the smallest, No. 50, is 0.001 inch, 1 thou or about 25 µm in diameter.
SWG was fixed by [[Order of Council]] August 23, 1883. It was constructed by improving the [[Birmingham Wire Gauge]]. It was made legal standard March 1, 1884 by the British [[Board of Trade]].
 
The basis of the system is the [[Thou_(length)|mil]], or 0.001[[inch|in]]. No. 7/0, the largest size, is 0.50 in. (500 mils or 12.7 mm) in diameter, and the smallest, No. 50, is 0.001 in. (1 mil or about 25 µm) in diameter. Between each gauge, the weight diminishes by approximately 20%. Because the weight per unit length is related to the area, and therefore the square of the diameter, the diameter diminishes by approximately 10.6%:
 
:<math>\mbox{Diameter Ratio} = 1-(1-0.2)^{\frac{1}{2}} \approx 10.6%</math>
----
 
A table of wire gauges and diameters is shown below.<ref>[[LewcoS]] Wire Tables 1962</ref><ref>{{Citation |url=http://www.unc.edu/~rowlett/units/scales/wiregauge.html |title=American and British Wire Gauges |author=Russ Rowlett |publisher=University of North Carolina at Chapel Hill |year=2008 |accessdate=2011-04-06}}</ref> The relationship of diameter to gauge is piecewise linear, only approximating a (constant-ratio) exponential curve.
 
|+== BritishTable SWGof British (Standard Wire Gauge)Gauges and diameters ==▼
{| class="wikitable" style="text-align:center"
▲|+ British SWG (Standard Wire Gauge) diameters
|-
! SWG
! in
Line 261 ⟶ 252:
|0.0010
|0.0254
|}<ref>[http://www.unc.edu/~rowlett/units/scales/wiregauge.html Wire gauge table (U.S./U.K.)] by Russ Rowlett, University of North Carolina at Chapel Hill, 2008</ref>
|}
 
== See also ==
{{From Wikipedia|American_wire_gauge}}
*[[American wire gauge]]
* [[Stubs IronAmerican Wirewire Gaugegauge]]
 
== References ==
{{reflist}}
 
[[Category:Wire gaugesWiring]]
 
[[de:Imperial Standard Wire Gauge]]
[[fr:Standard Wire Gauge]]
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