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'''British Standard Wire Gauge''' ('''SWG''') is a set of wire sizes given by [[British_Standards|BS]] 3737:1964 (now withdrawn), and is generally abbreviated to SWG.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▲'''British Standard Wire Gauge''' is a set of wire sizes given by [[British_Standards|BS]] 3737:1964 (now withdrawn), and is generally abbreviated to SWG.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 {{nowrap|0.001 [[inch|in]]}}. No. 7/0, the largest size, is {{nowrap|0.50 in}}. (500 mils or {{nowrap|12.7 mm}}) in diameter, and the smallest, No. 50, is {{nowrap|0.001 in}}. ({{nowrap|1 mil}} or about {{nowrap|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]]
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