B.W.G Feet Yards 1.000 feet Miles Ohms Ohms Ohms Ohms
No. per Ohm. per Ohm. per Ohm. per Ohm. per foot. per yard. per 1.000 per mile.
foot.
0000 19966.5 6655.5 19.9665 3.7815 .000050684 .00156252 .050084 .264443
000 17497.15 5832.3833 17.49715 3.31385 .0000571522 .0001714566 .0571522 .301763
00 13988.64 4662.68 13.98804 2.64925 .000071489 .000214467 .071489 .377465
0 11198.17 3732.7333 11.19817 2.12086 .0000893002 .0002679006 .0893002 .471505
1 8718.30 2906.10 8.71830 1.6512 .00011470 .0003441 .114701 .60562
2 7813.50 2604.50 7.81350 1.47973 .00012799 .00038397 .12799 .67580
3 6498.14 2166.0466 6.49814 1.23071 .00015389 .00046167 .15389 .81254
4 5487.107 1829.0357 5.487107 1.03923 .000182245 .000546735 .182245 .962256
5 4688.51 1562.8366 4.68851 .887975 .000213287 .000639861 .213287 1.12616
6 3991.91 1330.6366 3.99191 .756045 .000250506 .000751518 .250506 1.32267
7 3138.59 1046.1966 3.13859 .59443 .000318614 .000955842 .318614 1.68228
8 2637.29 879.0966 2.63729 .499486 .000379177 .001137531 .379177 2.00206
9 2121.84 707.280 2.12184 .401864 .000471289 .001413867 .471289 2.488405
10 1739.40 579.80 1.73940 .329432 .000574911 .001724733 .574911 3.03553
11 1394.93 464.9766 1.39493 .264191 .000716882 .002150646 .716882 3.78514
12 1150.91 383.6366 1.15091 .217976 .000868875 .002606625 .868875 4.58766
13 874.252 291.4173 .874252 .165578 .00114383 .00343149 1.14383 6.03945
14 667.338 222.446 .667338 .12639 .00149849 .00449547 1.49849 7.91203
15 502.175 167.39166 .502175 .095109 .00199134 .00597402 1.99134 10.5142
16 409.276 136.42533 .409276 .077514 .00244334 .00733002 2.44334 12.9008
17 325.871 108.62366 .325871 .061718 .0030687 .0092061 3.0687 16.20274
18 232.585 77.52833 .232585 .04405 .0042995 .0128985 4.2995 22.7014
19 170.879 56.95966 .170879 .032363 .0058521 .0175563 5.8521 30.8991
20 149.3915 49.797166 .1493915 .022475 .00842703 .02528109 8.42703 44.4947
21 99.195 33.065 .099195 .018787 .01008110 .03024348 10.08116 53.2285
22 75.9461 25.315366 .0759461 .014384 .0131672 .0395016 13.1672 69.5230
23 60.54377 20.181256 .06054377 .011467 .0165170 .0495510 16.5170 87.2096
24 46.8851 15.628356 .0468851 .0088798 .02132874 .06398622 21.32874 112.616
25 38.748 12.916 .038748 .0073386 .025808 .077424 25.808 136.265
26 31.3859 10.461966 .0313859 .0059443 .03186144 .09558432 31.86144 168.229
27 24.79873 8.266243 .02479873 .0046967 .0403246 .1209738 40.3246 212.914
28 18.98653 6.328843 .01898653 .0035959 .05266892 .15800676 52.66892 278.092
29 16.3710 5.4570 .0163710 .0031006 .0610834 .1832502 61.0834 322.521
30 13.9493 4.649766 .0139493 .0026419 .07168825 .21506475 71.68825 378.514
RESISTANCE & WEIGHT
B.W.G Ohms Lbs.
No. per lb. per Ohm.
0000 .000080272 12457.5
000 .000104529 9566.7
00 .000163553 6114.24
0 .000255196 3918.58
1 .00042102 2375.18
2 .00052422 1907.59
3 .00075786 1319.50
4 .0010629 940.844
5 .0014558 686.911
6 .0020082 497.96
7 .00324863 307.822
8 .00460101 217.343
9 .00710791 140.689
10 .0105772 94.543
11 .0164462 60.842
12 .0241593 41.392
13 .0418692 23.8839
14 .0718583 13.9163
15 .126788 7.8872
16 .191045 5.2344
17 .301355 3.31835
18 .59157 1.6904
19 1.09596 .912445
20 2.27254 .44003
21 3.25229 .30748
22 5.54843 .18023
23 8.73035 .11454
24 14.5579 .068691
25 21.3142 .046917
26 32.4863 .030782
27 52.0367 .019217
28 88.7724 .011265
29 119.404 .008375
30 164.4762 .0060804
PURE COPPER weighs 555 lbs. per cubic foot. The Resistance of 1 mil. foot at 60° Fahr. is, according to Dr. Matthiessen, 10.32311 ohms. Upon these data the above Table has been calculated.
The Resistance of Copper varies with the temperature about 0.38 per cent. per degree Centigrade, or 0.21 per cent. per degree Fahrenheit.
STRANDED WIRES.--With a conductor of a definite lenght, made of Stranded Wires, the total weight is greater, and the Resistance less than is a similar length of Conductor with Wires not Stranded.
To convert--Inches to Millimetres multiply by 25.3994
Feet to Metres " .3048
Yards to Metres " .9144
Miles to Kilometres " .6214
Pounds to Kilogrammes " .45359
PEPARED BY WALTER T. GLOVER & CO., ELECTRICAL WIRE AND CABLE MAKERS, 25, BOOTH STREET MANCHESTER.