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 261
learly the flexible tubing which must sepa-rately enclose each wire at every outlet, reaching from the last porce-lain support into a switch box, or on ceiling or wall outlets, whereno box is used, at least 1 inch beyond the surface. In the case ofcombination gas and electric fixtures the tube must… … Fig. 110. Section Through Floor Showing Use of Tubing or Loom or porcelain, that portion of the circuit which cannot be so supportedmust be installed with approved metal conduit, or approved armoredcable, except that if the difference of potential between the wires isnot over 300 volts, and if the…
Electrical engineering
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