Standard wire gauge: Difference between revisions
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'''British Standard Wire Gauge''' ('''SWG''') is a set of wire sizes given by British_Standards 3737:1964 (now withdrawn). 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. |
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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. |
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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]]. |
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The basis of the system is the [[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%: |
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:<math>\mbox{Diameter Ratio} = 1-(1-0.2)^{\frac{1}{2}} \approx 10.6%</math> |
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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. |
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! SWG |
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! in |
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|0.0010 |
|0.0010 |
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|0.0254 |
|0.0254 |
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|}<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> |
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==See also== |
== See also == |
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{{From Wikipedia|American_wire_gauge}} |
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*[[American wire gauge]] |
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*[[ |
* [[American wire gauge]] |
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==References== |
== References == |
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{{reflist}} |
{{reflist}} |
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[[Category: |
[[Category:Wiring]] |
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[[de:Imperial Standard Wire Gauge]] |
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[[fr:Standard Wire Gauge]] |
Latest revision as of 20:21, 20 October 2019
British Standard Wire Gauge (SWG) is a set of wire sizes given by British_Standards 3737:1964 (now withdrawn). 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.
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.
Table of British Standard Wire Gauges and diameters
SWG | in | mm | step |
---|---|---|---|
7/0 | 0.500 | 12.700 | 0.036"/gauge |
6/0 | 0.464 | 11.786 | 0.032"/gauge |
5/0 | 0.432 | 10.973 | |
4/0 | 0.400 | 10.160 | 0.028"/gauge |
3/0 | 0.372 | 9.449 | 0.024"/gauge |
2/0 | 0.348 | 8.839 | |
0 | 0.324 | 8.230 | |
1 | 0.300 | 7.620 | |
2 | 0.276 | 7.010 | |
3 | 0.252 | 6.401 | 0.020"/gauge |
4 | 0.232 | 5.893 | |
5 | 0.212 | 5.385 | |
6 | 0.192 | 4.877 | 0.016"/gauge |
7 | 0.176 | 4.470 | |
8 | 0.160 | 4.064 | |
9 | 0.144 | 3.658 | |
10 | 0.128 | 3.251 | 0.012"/gauge |
11 | 0.116 | 2.946 | |
12 | 0.104 | 2.642 | |
13 | 0.092 | 2.337 | |
14 | 0.080 | 2.032 | 0.008"/gauge |
15 | 0.072 | 1.829 | |
16 | 0.064 | 1.626 | |
17 | 0.056 | 1.422 | |
18 | 0.048 | 1.219 | |
19 | 0.040 | 1.016 | 0.004"/gauge |
20 | 0.036 | 0.914 | |
21 | 0.032 | 0.813 | |
22 | 0.028 | 0.711 | |
23 | 0.024 | 0.610 | 0.002"/gauge |
24 | 0.022 | 0.559 | |
25 | 0.020 | 0.5080 | |
26 | 0.018 | 0.4572 | 0.0016"/gauge |
27 | 0.0164 | 0.4166 | |
28 | 0.0148 | 0.3759 | 0.0012"/gauge |
29 | 0.0136 | 0.3454 | |
30 | 0.0124 | 0.3150 | 0.0008"/gauge |
31 | 0.0116 | 0.2946 | |
32 | 0.0108 | 0.2743 | |
33 | 0.0100 | 0.2540 | |
34 | 0.0092 | 0.2337 | |
35 | 0.0084 | 0.2134 | |
36 | 0.0076 | 0.1930 | |
37 | 0.0068 | 0.1727 | |
38 | 0.0060 | 0.1524 | |
39 | 0.0052 | 0.1321 | 0.0004"/gauge |
40 | 0.0048 | 0.1219 | |
41 | 0.0044 | 0.1118 | |
42 | 0.004 | 0.1016 | |
43 | 0.0036 | 0.0914 | |
44 | 0.0032 | 0.0813 | |
45 | 0.0028 | 0.0711 | |
46 | 0.0024 | 0.0610 | |
47 | 0.0020 | 0.0508 | |
48 | 0.0016 | 0.0406 | |
49 | 0.0012 | 0.0305 | 0.0002"/gauge |
50 | 0.0010 | 0.0254 |
See also
This page uses Creative Commons Licensed content from Wikipedia:American_wire_gauge (view authors).
References
- ^ Wire gauge table (U.S./U.K.) by Russ Rowlett, University of North Carolina at Chapel Hill, 2008