Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 107
emeans is employed for keeping it warm, owing to the liability ofthe insulation to be injured by cracking. Conduit systems must be ventilated in order to prevent ex-plosion due to the collecting of explosive mixtures of gas. Manyspecial ventilating schemes have been tried, but the majority… … Fig. 49. Tackle for Fastening Cable to Rope to Draw CableThrough Ducts safe for workmen to enter the splicing vault until the impure air hasbeen pumped out. Auxiliary ducts are laid over the main ducts and distributionis accomphshed from handholes. It is customary to ground the lead sheaths of the…
Electrical engineering
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