DIAMETERS AND INCREASE IN DIAMETERS OF ENAMELLE DROUND COPPER WINDING WIRES 
(SWG SIZES) (BASIS : IS 13730-0-1)
Conductor Diameter Conductor
Tolerance
(mm)
Grade 1 Grade 2 Grade 3
Minimum
 Increase (mm)
Maximum Overall Dia. (mm) Minimum 
Increase (mm)
Maximum Overall Dia. (mm) Minimum 
Increase (mm)
Maximum
Overall Dia. (mm)
SWG MM
11 2.946 0.030 0.045 3.029 0.084 3.072 0.127 3.112
12 2.642 0.027 0.043 2.772 0.081 2.764 0.123 3.083
13 2.337 0.024 0.042 2.415 0.079 2.455 0.119 2.493
14 2.032 0.020 0.041 2.018 0.077 2.147 0.116 2.184
15 1.829 0.019 0.040 1.903 0.075 1.941 0.113 1.977
16 1.626 0.017 0.039 1.698 0.073 1.735 0.110 1.770
17 1.422 0.015 0.038 1.492 0.071 1.528 0.107 1.562
18 1.219 0.013 0.035 1.285 0.067 1.318 0.100 1.350
19 1.016 0.011 0.034 1.080 0.065 1.113 0.098 1.144
20 0.914 0.010 0.034 0.976 0.063 1.008 0.095 1.038
21 0.813 0.009 0.032 0.872 0.060 0.902 0.090 0.931
22 0.711 0.008 0.030 0.766 0.056 0.795 0.085 0.822
23 0.610 0.006 0.027 0.659 0.050 0.684 0.075 0.708
24 0.559 0.006 0.025 0.605 0.047 0.629 0.071 0.652
25 0.508 0.006 0.025 0.554 0.047 0.578 0.071 0.601
26 0.457 0.005 0.024 0.501 0.045 0.523 0.067 0.544
27 0.417 0.005 0.022 0.458 0.042 0.480 0.064 0.500
28 0.376 0.005 0.021 0.417 0.040 0.435 0.060 0.454
29 0.345 0.005 0.020 0.382 0.038 0.401 0.057 0.418
30 0.315 0.004 0.019 0.349 0.035 0.367 0.053 0.384
31 0.295 0.004 0.019 0.329 0.035 0.347 0.053 0.364
32 0.274 0.004 0.018 0.306 0.033 0.232 0.050 0.339
33 0.254 0.004 0.018 0.286 0.033 0.303 0.050 0.319
34 0.234 0.004 0.017 0.265 0.032 0.281 0.048 0.296
35 0.213 0.003 0.015 0.241 0.029 0.255 0.043 0.269
36 0.193 0.003 0.014 0.219 0.027 0.232 0.039 0.245
37 0.173 0.003 0.013 0.197 0.025 0.210 0.036 0.222
38 0.152 0.003 0.012 0.174 0.023 0.186 0.033 0.197
39 0.132 0.003 0.011 0.152 0.021 0.162 0.030 0.171
40 0.122 0.003 0.010 0.141 0.019 0.151 0.028 0.160
41 0.112 0.003 0.009 0.130 0.017 0.139 0.026 0.147
42 0.102 0.003 0.009 0.119 0.017 0.128 0.026 0.136
43 0.091 0.003 0.008 0.107 0.016 0.115 0.023 0.122
44 0.081 0.003 0.008 0.096 0.015 0.103 0.022 0.110
45 0.071 0.003 0.007 0.084 0.012 0.091 0.018 0.097
46 0.061 - - 0.074 - 0.081 - -
47 0.051 - - 0.062 - 0.068 - -
48 0.041 - - 0.050 - 0.056 - -
Note : For intermidiate conductor diameters the minimum Increase figure corresponding to the next largest nominal conductor diameter shall be taken.: Maximum overall diameter for intermidiate conductor size is equal to maximum overall diameter of next largestnominal conductor diameter corrected by difference in conductor diameters.
Note: In view of continuous improvements in design & process specifications given above are subject to change without notice.