Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 256
aled knob andtube method will be forbidden by the National Electric Code. The cost of wiring according to this method is about one-thirdof the cost of circuits nm in rigid conduit, and about one-half of thecost of circuits run in armored cable. The latter method of wiring 213 14 ELECTRIC WIRING is… … Fig. 15. Knob and Tube Wiring. and tubes, the circuit work being run concealed between the floor beamsand studs of a frame building. The knobs are used when the circuitsrun parallel to the floor beams; and the porcelain tubes are used whenthe circuits are run at right angles to the floor beams.…
Architecture · Building · Carpentry
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