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CONCEALED KNOB-AND-TUBE WIRING
CONCEALED KNOB-AND-TUBE WIRINGCONCEALED KNOB-AND-TUBE WIRING67. Concealed knob-and-tube wiring was used extensively at one time for the wiring of frame buildings when a low-cost installation was essential. It is still allowed by the National Electrical Code, but only for extensions of existing installations (or otherwise by special permission), and it is rarely used because more labor is required than with common cable systems. It has been superseded for low-cost installations by nonmetallic-sheathed cable.68. Extensions of concealed knob-and-tube wiring are seldom practical today. (Adapted from Practical Electrical Wiring, 21st ed., © Park Publishing, 2011, all rights reserved.) Although this ha…
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Terrell Croft; Frederic P. Hartwell; Wilford I. Summers: American Electricians' Handbook, Sixteenth Edition. CONCEALED KNOB-AND-TUBE WIRING, Chapter (McGraw-Hill Professional, 2013), AccessEngineering