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 270
tute a satis-factory support. 239 116 UNDERWRITEBS REQUIREMENTS (2) Junction boxes may be inserted in the conduit system at the re-quired intervals, in which insulating supports of approved type must be in-stalled and secured in a satisfactory manner so as to withstand the weight ofthe conductors… … Fig. 117. Method of Supporting Conduit Risers an angle of not less than 90 degrees, and carried a distance of not less thantwice the diameter of the cable from its vertical position. Cables so suspendedmay be additionallv secured to these insulators by tie wires. The second method is ilhistrated in…
Electrical engineering
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