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 248
thodof support as that shownin Fig. 90 should be fol-lowed. Fig. 91 shows aless desirable method ofsupport. In low ceiling rooms where wires are exposed to mechani-cal injury, wood guard strips (see Fig. 92) may be used to ad-vantage. Where wires pass through partitions or walls they mustbe… … Fig. 90. Method of Running Wires between Widely-Spaced Girder.s r l^ -nD- Fig. 91. Method of Avoiding Sag between Widely-Spaced Girders shown in Figs. 93 and 94. When iron pipe or conduit is used theinsulation of each wire must be reinforced by flexible tubing extend- 220 UNDERWRITERS REQUIREMENTS…
Electrical engineering
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