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 193
Fig. 43.* Well-Installed Roof Wiring Outside Wires on Buildings. Where outside lines are supportedon buildings, they should be at least 7 feet above the highest pointof flat roofs and at least 1 foot above the ridge of pitch roofs over … Fig. 44.* Approved Form of Roof Structure for Safe Installation which they pass and the roof structures should be of the most sub-stantial description. Figs. 43 and 44 show two forms of roof struc-ture which hold the wires high enough so that they cannot sag and * Courtesy Inspection Department,…
Electrical engineering
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