Cinematographic annual : 1931 (1931)

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406 <'I\,:.\IAT» K'.UAl'Hir ANXFAL Carrying Capacity of Copper Wires The following table, showing the allowable carrying capacity of copper wires and cables of 98% conductivity, according to the standard adopted by the American Institute of Electrical Engineers, must be followed in placing interior conductors. For insulated aluminum wire the safe carrying capacity is 84% of that given in the following tables for copper wire with the same kind of insulation. Table A Table B B. &S. Circular Rubber Other Gauge Mills Insulation Insulations A mperes A mperes 18 1,624 3 5 16 2,583 6 8 14 4.107 12 16 12 6,530 17 23 IO 10,380 24 32 8 16,510 33 46 6 26,250 46 65 5 33.ioo 54 77 4 41,740 65 92 3 52,630 76 110 2 66,370 90 131 I 83,690 107 156 0 105,500 127 185 oo i33,ioo 150 220 ooo 167,800 177 262 oooo 211,600 Circular Mils. 210 312 200,000 200 300 300,000 270 400 400,000 330 500 500,000 390 590 600,000 450 680 700,000 500 760 800,000 550 840 900,000 600 920 1,000,000 650 1,000 1,100,000 690 1,080 1,200,000 730 1,150 1,300,000 770 1,220 1,400,000 810 1,290 1,500,000 850 1,360 1,600,000 890 1,430 1,700,000 930 1,490 1,800,000 970 1,550 1,900,000 1,010 1,610 2,000,000 1,050 1,670 The lower limit is specified for rubber-covered wires to prevent gradual deterioration of the high insulations by the heat of the wires, but not from fear of igniting the insulation. The question of drop is not taken into consideration in the above tables.