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 309
burn ahole in the gas pipe and ignite the gas.All thi-eaded parts of boxes and all threads on locknuts and metal bushings must be clean cut and well fitted inorder to insure that permanent and reliable electrical continuity of theconduit system which is one of the chief requirements for conduit… … Fig. 130. Common Tvpe of()utlet Box 277 154 UNDERWRITERS REQUIREMENTS Set screw connections have been found unsatisfactory as theyloosen with the vibration of buildings and with changes of tempera-ture, and only regular screwed thread joints or substantial clampsshould be used at all conduit and…
Electrical engineering
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-649-386.webp)
