Servicing projection equipment (1932)

Page scan 000172 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000172
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 15, 2024
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156 FORMULAS 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. B. & S. Gauge Table A Rubber Insulation Table B Other Insulations Resistance per 1000 ft. in International Ohms Amperes Amperes At 75° F. 18 3 5 6.567 16 6 8 4.04 14 12 16 2.565 12 17 23 1.601 10 24 32 1.01 8 33 46 .641 3 6 46 65 .400 4 5 54 77 .317 2 4 65 92 .252 5 3 76 110 .200 4 2 90 131 .157 9 1 107 156 .125 8 0 127 185 .099 48 00 150 220 .078 87 000 177 262 .062 51 0000 210 312 .049 66 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.