Anonymous user
Updated table to show piecewise-linear structure.
(Updated table to show piecewise-linear structure.) |
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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]].
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%:
:<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
{| class="wikitable" style="text-align:center"
|+ British SWG (Standard Wire Gauge) diameters
|-
! SWG
! in
! mm
! step
|-
|7/0
|0.
|12.700
|0.036"/gauge
|-
|6/0
|0.464
|11.786
|rowspan=2| 0.032"/gauge
|-
|5/0
Line 29 ⟶ 33:
|-
|4/0
|0.
|10.160
|0.028"/gauge
|-
|3/0
|0.372
|9.449
|rowspan=5| 0.024"/gauge
|-
|2/0
Line 45 ⟶ 51:
|-
|1
|0.
|7.620
|-
Line 55 ⟶ 61:
|0.252
|6.401
|rowspan=3| 0.020"/gauge
|-
|4
|0.232
|5.893
|-
|5
|0.212
|5.385
|-
|6
|0.192
|4.877
|rowspan=4| 0.016"/gauge
|-
|7
Line 67 ⟶ 81:
|-
|8
|0.
|4.064
|-
Line 77 ⟶ 91:
|0.128
|3.251
|rowspan=4| 0.012"/gauge
|-
|11
Line 91 ⟶ 106:
|-
|14
|0.
|2.032
|rowspan=5| 0.008"/gauge
|-
|15
Line 111 ⟶ 127:
|-
|19
|0.
|1.016
|rowspan=4| 0.004"/gauge
|-
|20
Line 129 ⟶ 146:
|0.024
|0.610
|rowspan=3| 0.002"/gauge
|-
|24
Line 135 ⟶ 153:
|-
|25
|0.
|0.5080
|-
Line 141 ⟶ 159:
|0.018
|0.4572
|rowspan=2| 0.0016"/gauge
|-
|27
Line 149 ⟶ 168:
|0.0148
|0.3759
|rowspan=2| 0.0012"/gauge
|-
|29
Line 157 ⟶ 177:
|0.0124
|0.3150
|rowspan=9| 0.0008"/gauge
|-
|31
Line 167 ⟶ 188:
|-
|33
|0.
|0.2540
|-
Line 187 ⟶ 208:
|-
|38
|0.
|0.1524
|-
Line 193 ⟶ 214:
|0.0052
|0.1321
|rowspan=10| 0.0004"/gauge
|-
|40
Line 223 ⟶ 245:
|-
|47
|0.
|0.0508
|-
Line 233 ⟶ 255:
|0.0012
|0.0305
|rowspan=2| 0.0002"/gauge
|-
|50
|0.
|0.0254
|}
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