Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 37
ng now in use commercially forwires are: 1. Rubber; 2. Weather proof; 3. Slow burning; 4. Slow burning weather proof; 5. Armoured. WIRES AND WIRE CALCULATIONS 725 Rubber Covered Conductors.—This class of conductor con-sists of a tinned copper wire with a rubber covering, protectedby an outside… … Fig. 808.—Rubber insulated telephone and telegraph wires. The inner coat of rubber shouldbe free from sulphur or other substances liable to corrode the copper. Oues. What are the disadvantages of rubber insula-tion } Ans. It deteriorates more or less rapidly and is quicklyinjured by temperatures…
Electrical engineering
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