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 173
hich may in severe cases assume thesize of powerful arcs. The location of these devices away from all Fig. 26. Interior View of SmallStarting Rheostat 150 UNDERWRITERS REQUIREMENTS 29 combustible material is thus imperative. They are often installedin separate buildings with other emergency… … m Fig. 27. Electrolytic Lightning Arrester for 7,000 Volts possible bends, the use for ground wires of copper wire not smallerthan No. 6, and especially the securing of permanently good groundconnections are the chief considerations. Two separate ground con-nections are often desirable. Fig. 27…
Electrical engineering
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