International Library of Technology · Scranton, International Textbook Co. · leaf 615
ngth shall be made on a sample of wire thathas been immersed for 72 hours in water, 1 foot ofwhich is submerged in a conducting liquid held in ametal trough, one of the transformer terminalsbeing connected to the copper of the wire and theother to the metal of the trough. Tests by the Underwriters… … Fig. 6. CONCEALED KNOB-AND-TUBE AVORK. 21. The most common way of concealing wires in abuilding is to run them through the joists between thefloors and ceilings andthrough studding par-titions, and to insulatethem by means of por-celain knobs and tubes,as shown in Fig. 6.The holes should notbe…
Electrical engineering
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