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GOOD CONDUCTORS—Silver, copper, gold, and other metals.

PARTIAL CONDUCTORS—Human body, water, marble, cotton, wood and paper.

Non-CONDUCTORS—Dry air, glass, porcelain, mica, gutta-percha, ebonite, silk and oils.

Table of Dimensions and Resistances of Pure

Copper Wire.*

REVISED.

0000

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Area.

W'gt & Length. Sp.gr. 8.9|
No. Diam.
Circular i Square

Lbs. 1 Pounds Feet B. & S. Mils.

per

per per Mils. Inches.

1000 ft. mile. pound. 460.000 211600.0 166190.2 640.73 | 3383,04

1.56 000 409.640 167805.0 131793.7 508.12 2682.85

1.97 364.800 133079.0 104520.0 402.97 2127.66

2.48 324.950 105592.5 82932,2 319.74 1688.20

3.13 289.300 83694.5 65733.5 253.43 1338.10

3.95 257.630 66373.2 52129.4 200.98 1061.17

4.98 229.420 52633.5 41338.3 159.38 841.50

6.28 204.310 41742.6 32784.5 126.40 667.38

7.91 181.940 33102.2 25998.4 100,23 529.23

9.98 162.020 26250.5 20617.1 79.49 419.69

12.58 144.280 20816.7 16349.4 63.03 332.82

15.86 128.490 16509.7 12966.7 49.99 263.96

20.00 114.430 13094.2 10284.2 39.65 209.35

25.22 10 101.890 10381.6 8153.67 31.44 165.98

31.81 90.742 8234,11 6467.06 24.93 131.65 40.11 80.808 6529.94 5128.60 19.77 104.40

50.58 13 71.961 5178.39 4067.09 15.68 82.792 63.78 14 64.084 4106.76 3225.44 12.44 65.658 80.42 57.068 3256.76 2557.85

9.86
52.069

101.40 16 50.820 2582.67 2028.43 7.82 41.292 127.87

45.257 2048.20 1608.65 6.20 32.746 161.24 40.303 1624.33 1275.75 4.92 25.970 203.31 35.890 1288.09 1011.66 3.90 20.594 256.89 31.961 1021.44 802.24 3.09 16.331 323.32 28.462 810.09 636.24 2.45 12.952 407.67 25.347 642.47 504.60 1.95 10.272 514.03 22.571 509.45 400.12

1.54 8.1450 648.25 20.100 404.01 317.31 1.22 6.4593 817.43 17.900 320.41 251.65

.97 5.1227 1030.71 15.940 254.08 199.56

4.0623 1299.77 14.195 201.50 158.26

3.2215 1638.97 12.641 159.80 125.50

.48 2.5548 2066.71 11.257 126.72 99.526

2.0260 2606.13 30 10.025 100.50 78.933 .30 1.6068 3286.04 8.928 79.71 62.603

1.2744 4143.18 7.950 63.20 49.639

1.0105 5225.26 7.080 50.13 39.369

.8014 6588.33 6.304 39.74 31.212

.6354 8310.17 5.614 31.52 24.753 .10 .5039 10478.46 36 5.000 25.00 19.635

.3997 13209.98 4.453 19.83 15.574 .06 .3170 16654.70 3.965 15.72 12.347

.2513 21006.60 39 3.531 12.47

9.7923 .04 .1993 26427.83 3.144 9.88

7.7365 .03 .1580 33410.05 *1 mile pure copper wire 1-16 in. diam.=13.59 ohms at 15.5°C or 59.9°F,

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Table of Dimensions and Resistances of Pure

Copper Wire.*

REVISED.

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6.9

Resistance at 75°F.

lbs p. 1000 Feet per R Ohms Feet

Ohms ft. ins'd lb. ins'd ohms per per I per

per H.B.&H. H.B.&H. 1000 feet. mile.

ohm.

pound. line wire. line wire. .04904 .25891 | 20392.9

.00007653

800

1.25 .06184 .32649 16172.1

.00012169 666

1.50 .07797 .41168 ! 12825.4

.00019438 500

2.00 .09827 .51885 | 10176.4

.00030734 363

2.75 .12398 .65460 8066.0

.00048920 313

3.20 .15633 .82543 6396.7

.00077784 250

4.00 .19714 1.04090 5072.5

.0012370 200

5.00 .24858 1.31248 4022.9

.0019666 144 .31346 1.65507 3190.2

.0031273 125

8.0 .39528 2.08706 2529.9

.0049728

9.5 .49845 2.63184 2006.2

.0079078

11.5 .62849 3.31843 1591.1

.0125719

14.5 .79242 4.18400 1262.0

.0199853 .99948 5.27726 1000.5

.0317946

20.0 1.2602 6.65357 793.56

.0505413
1.5890
8.39001 629.32

.0803641

32.0 2.0037 10.5798 499.06

.127788 2.5266 13.3405 395.79

.203180

45.0 3.1860 16.8223 313.87

.323079 4.0176 21.2130 248.90

.513737

70.0 5.0660 26.7485 197.39

.816839 6.3880 33.7285 156.54

1.298764

90.0 8.0555 42.5329 124.14

2.065312 10.1584 53.6362 98.44

3.284374 12.8088 67.6302 78.07

5.221775 16.1504 85.2743 61.92

8.301819 20.3674 107.540

49.10

13.20312 25.6830 135.606

38.94

20.99405 32.3833 170.984

30.88

33.37780 40.8377 215.623

24.49

53.07946 51.4952 271.895

19.42

84.39916 64.9344 342.854

15.40

134.2005 81.8827 432.341

12.21 213.3973 103.245 545.133

9.686 339.2673 130.176 687.327

7.682 539.3404 164.174 866.837

6.091 857.8498 207.000 1092.96

4.831 1363.786 261.099 1378.60

3.830 2169.776 329.225 1738.31

3.037 3449.770 415.047 2191.45

2.409 5482.766 523.278 2762.91

1.911 8715.030 660.011 3484.86

1.515 13864.51 832.228 4394.16

1.202 22043.92 40 1049.718 5542.51

.9526 35071.11 *1 mile pure copper wire 1-16 in. diam.=13.59 ohms at 15.5°C. or 59.99"

37

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Table showing efficiencies of different sizes of motors with correspondent

voltage and ampage.

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15

Ampload,
of Motor. 16 | 14

Size of Wire -(BE Gaugel
12 10 1 8 1 6 15 14 I 3 I 2 I LL, O 100 000 leo00
Distance in fect of motor from mains that current can be carried with 1 volt loss,
721 192 308 490778 1232 1560 1929 1
60 96 154 245 389 616 780 960 12167
40 64 1057166 2057 473 531 670T 846 1066
30 48 77 122 194 308 390 4801 608 780 98571232
25 39 63 100 160 254 319 402 508 640 806 1020 11282

25 40 65 104 164 208 258 328 416 525 657 836 i 1187 |
10
31 50 80 126 154 201

320 4031 510118 641! 121 61 100 125 153 194

250

3151 394 500 712
84 106 134 2697 2131 208

340 427 542
18

68 86 106 1351 - 173 219 273 348 495 524
20

63

125 160 201 255 320 406 510 62 76 971

797 2501 356 399
30

164 209 310 340
63

128 160 2031 255
50

- 64

102 128 162 204 60

421 53

82 105 155 170 70

46 58

92 116 146
80

50

80 102 128 90

75 107
100

81 102
120
150

54

68 200

41

51

25

81

157
34
20

40

51

81

62

73

56

68

54

68.

85

Table of sizes of wires for different current capacities of motors, and distances

from supply.

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