Imperial wire gauge

Also called the New Standard Wire Gauge,Legalized Standard Wire Gauge, Imperial Standard Wire Gauge,  or in other countries, simply British Standard. Abbreviated S.W.G. or I.S.W.G. Fixed by order of council August 23, 1883. It was constructed by improving the Birmingham wire gage. Made legal standard March 1, 1884.

For a table comparing diameters of this gauge with other wire gauges, see wire.

For electrical equivalents in ISO metric sizes, see the following tables:

 

Imperial Wire Gauge
Gauge Diameter,
Area of cross-section,
square centimeters
Resistance,
copper,
ohms per meter
Weight,
copper,
grams per meter
inches centimeters
7/0 0.5000 1.270 1.267 0.000137 1134
6/0 0.4640 1.179 1.091 0.000159 976.3
5/0 0.4320 1.097 0.946 0.000184 846.3
0000 0.4000 1.016 0.811 0.000215 725.6
000 0.3720 0.945 0.701 0.000248 627.6
00 0.3480 0.884 0.614 0.000283 549.6
0 0.3240 0.825 0.532 0.000327 476.1
1 0.3000 0.762 0.456 0.000381 408.1
2 0.2760 0.701 0.386 0.000451 345.4
3 0.2520 0.640 0.322 0.000541 288.0
4 0.2320 0.589 0.273 0.000638 244.1
5 0.2120 0.538 0.228 0.000764 203.8
6 0.1920 0.488 0.187 0.000931 166.8
7 0.1760 0.447 0.157 0.00111 140.5
8 0.1600 0.406 0.130 0.00134 116.1
9 0.1440 0.366 0.105 0.00166 94.0
10 0.1280 0.325 0.0830 0.00210 74.3
11 0.1160 0.295 0.0682 0.00255 61.0
12 0.1040 0.264 0.0548 0.00317 49.0
13 0.0920 0.234 0.0429 0.00406 38.4
14 0.0800 0.203 0.0324 0.00536 29.0
15 0.0720 0.183 0.0263 0.00662 23.5
16 0.0640 0.163 0.0208 0.00838 18.6
17 0.0560 0.142 0.0159 0.0109 14.2
18 0.0480 0.122 0.0117 0.0149 10.4
19 0.0400 0.102 0.00811 0.0215 7.26
20 0.0360 0.0914 0.00657 0.0265 5.88
21 0.0320 0.0813 0.00519 0.0335 4.64
22 0.0280 0.0711 0.00397 0.0438 3.56
23 0.0240 0.0610 0.00292 0.0596 2.61
24 0.0220 0.0559 0.00245 0.0709 2.19
25 0.0200 0.0508 0.00203 0.0858 1.80
26 0.0180 0.0457 0.00164 0.106 1.47
27 0.0164 0.0417 0.00136 0.128 1.22
28 0.0149 0.0376 0.00111 0.157 0.893
29 0.0136 0.0345 0.000937 0.185 0.839
30 0.0124 0.0315 0.000779 0.223 0.697
31 0.0116 0.0295 0.000682 0.255 0.610
32 0.0108 0.0274 0.000591 0.294 0.529
33 0.0100 0.0254 0.000507 0.343 0.453
34 0.0092 0.0234 0.000429 0.406 0.384
35 0.0084 0.0213 0.000358 0.486 0.320
36 0.0076 0.0193 0.000293 0.594 0.262
37 0.0068 0.0173 0.000234 0.742 0.210
38 0.0060 0.0152 0.000182 0.954 0.163
39 0.0052 0.0132 0.000137 1.27 0.123
40 0.0048 0.0122 0.000117 1.49 0.104
41 0.0044 0.0112 0.0000981 1.77 0.0878
42 0.0040 0.0102 0.0000811 2.15 0.0726
43 0.0036 0.00914 0.0000657 2.65 0.0588
44 0.0032 0.00813 0.0000519 3.35 0.0464
45 0.0028 0.00711 0.0000397 4.38 0.0356
46 0.0024 0.00610 0.0000292 5.96 0.0261
47 0.0020 0.00508 0.0000203 8.58 0.0181
48 0.0016 0.00406 0.0000130 13.4 0.0116
49 0.0012 0.00305 0.00000730 23.8 0.00653
50 0.0010 0.00254 0.00000507 34.3 0.00453

sources

1

New British Standard Gauge. This is abbreviated N. B. S. G. The following names are also used: English Legal Standard Wire Gauge. Imperial Wire Gauge. This gauge is the legal standard for Great Britain and is used for all kinds of wire. Its use in this country [the United States] is very limited.

Wire in Electrical Construction.
Trenton, NJ: John A. Roebling's Sons Company, 1916.
Page 51.

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