Birmingham wire gauge

The steps are irregular. Departmental sanction by the United States government ended in 1914.

Birmingham Wire Gauge
Gauge Diameter,
Area of cross-section,
square centimeters
Resistance,
copper,
ohms per meter
Weight,
copper,
grams per meter
inches centimeters
00000 0.500        
0000 0.454 1.153      
000 0.425 1.079      
00 0.380 0.965      
0 0.340 0.864      
1 0.300 0.762      
2 0.284 0.721      
3 0.259 0.658      
4 0.2320 0.589      
5 0.2120 0.538      
6 0.1920 0.488      
7 0.1760 0.447      
8 0.1600 0.406      
9 0.1440 0.366      
10 0.1280 0.325      
11 0.1160 0.295      
12 0.1040 0.264      
13 0.0920 0.234      
14 0.0800 0.203      
15 0.0720 0.183      
16 0.0640 0.163      
17 0.0560 0.142      
18 0.0480 0.122      
19 0.0400 0.102      
20 0.0360 0.0914      
21 0.0320 0.0813      
22 0.0280 0.0711      
23 0.0240 0.0610      
24 0.0220 0.0559      
25 0.0200 0.0508      
26 0.0180 0.0457      
27 0.0164 0.0417      
28 0.0149 0.0376      
29 0.0136 0.0345      
30 0.0124 0.0315      
31 0.0116 0.0295      
32 0.0108 0.0274      
33 0.0100 0.0254      
34 0.0092 0.0234      
35 0.0084 0.0213      
36 0.0076 0.0193      

sources

1

This is abbreviated B. W. G. It is the same as Stubs' Iron Wire Gauge, but entirely different from Stubs' Steel Wire Gauge. Galvanized Telegraph and Telephone Wire, both bare and insulated, and Galvanized Armor Wire are usually designated by this gauge. Its use is not very extensive and is becoming less.

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

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