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 282
cutting off current fromthem either automatically or by hand switches in accessible places.No combustible material should be permitted either in or near suchsigns. It is preferable that all the wiring be in conduit but where thisis impracticable, the supports and spacing of wires should be… … < S «O « H •«1^ *■•s! a a < -s -S sit ta O CU COis u UNDERWRITERS REQUIREMENTS 127 and braided wire necessary for a large sign requires skilful arrange-ment to avoid a serious blaze in case of failure. Signs of every size should be all metal, sheet steel being notless than No. 28 U. S. gauge…
Electrical engineering
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