[Electric engineering.] . 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 lights on itsside. This method effects no saving of copper; in fact, it. 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
[Electric engineering.] . 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 lights on itsside. This method effects no saving of copper; in fact, it. 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 Underwriters will not permit it with more than660 watts on a side. 42. Systems like the three-wire system, but using morewires and, consequently, more generators, have been pro-posed; but none of them have come into commercial use toany extent in the United States, because they are easilyunbalanced, because some of them give voltages too high for I I 3~OZI3 +// 1 330 + 0 jm i 2%o k \k\k A -° 220 -220 *- T * + g g JEf Fig. 15. interior wiring (550 volts being the limit of low-tensionworking), and because they are too complicated. They areused to some extent on the continent of Europe. Fig. 15 isa diagram of such a system. No fittings are shown, butthey must be numerous and complicated to make
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