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 170
ire. The switchboard itself should always be of slate marble, or 147 26 UNDERWRITERS REQUIREMENTS other strong non-combustible insulating material. The old woodracks (see Fig. 22) once used are no longer permitted. Fig. 23 showsa small, well-arranged switchboard. While the front of the switch-board… … Fig. 23,* Approved Typ Switchboard conductors be imperative. No makeshifts are tolerable on switch-boards under any conditions. Fig. 24 shows the back of a board.Every precaution must be taken to keep water or even moistureoff switchboards since a short-circuit would be easily started andthe result…
Electrical engineering
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