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
a street, and lightand power wires on the other, giving special attention to the neces-sary crossings, if any. In all outside pole work in towns due regardshould be given to the fact that lines consisting of many wires area serious hindrance to firemen in attacking a fire in the adjacent 168… … 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
Electrical engineering
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