International Library of Technology · Scranton, International Textbook Co. · leaf 554
30 INTERIOR WIRING. § 26 41. There is a method of running wires on the two-wireplan that is sometimes confused with the three-wire system;this is illustrated in Fig. 14. In this method the middlewire carries the whole current and each of the two outsidewires carry what current is necessary for the… … Fig. 14. often requires more than the two-wire system would, becausethe three wires must generally be of the same size, asexplained under the subject of cut-out protection. Theobject of the arrangement is solely to make it possible toturn off a number of the lights without running four wires.The…
Electrical engineering
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