[Electric engineering.] . mewhat more complicated, but owing to thesaving in line materials, the Edison three-wire system hasbeen introduced to a very great extent and still meets withmuch favor in new installations, besides extending the net-work of its wires from existing stations. Lately it has hada new competitor in the 220-volt two-wire system, whichhas grown in popularity with the perfecting of the 220-voltincandescent lamp. - 40. It is the usual practice to run the three wires nofarther within the building than to the centers of distri-bution, and from thesecenters to use the two-wire s
[Electric engineering.] . mewhat more complicated, but owing to thesaving in line materials, the Edison three-wire system hasbeen introduced to a very great extent and still meets withmuch favor in new installations, besides extending the net-work of its wires from existing stations. Lately it has hada new competitor in the 220-volt two-wire system, whichhas grown in popularity with the perfecting of the 220-voltincandescent lamp. - 40. It is the usual practice to run the three wires nofarther within the building than to the centers of distri-bution, and from thesecenters to use the two-wire system, dividing thecircuits as equally as pos-sible on the two sidesof the three-wire cir-cuit, as shown in thesketch, Fig. 13. By thismeans, the branch linesare fused on both sidesand amply protectedagainst excessive cur-rents, though not againsthigh voltage. If theneutral wire within thebuilding is protected by afuse as large as that ineither of the other mainwires, the danger of thatline opening is very small. fig. 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
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