[Electric engineering.] . fig. Fig. 21. 28 INTERIOR WIRING. 37 50. In installing annunciator systems, it is usual torun the battery wire, which is No. 14 or 16 annunci-ator wire, through the building at some central there are many rooms, it will be advisable to spliceon a length of No. 18 wire to extend from the pushin each room to the battery wire. The connection fromthe other side of the push button to the annunciator, thatis, the leading wire, should be No. 18. For the return-call system, a battery of four or five Leclanche cells isrequired. All wires used in annunciator ser
[Electric engineering.] . fig. Fig. 21. 28 INTERIOR WIRING. 37 50. In installing annunciator systems, it is usual torun the battery wire, which is No. 14 or 16 annunci-ator wire, through the building at some central there are many rooms, it will be advisable to spliceon a length of No. 18 wire to extend from the pushin each room to the battery wire. The connection fromthe other side of the push button to the annunciator, thatis, the leading wire, should be No. 18. For the return-call system, a battery of four or five Leclanche cells isrequired. All wires used in annunciator service should have dis-tinguishing colors to prevent battery wire may be blue, thereturn wire red, and the leading wireswhite. This arrangement will greatlysimplify the connections and reduce theliability of mistake. 51. Wiring- for Elevator Amrtmci-ator.—The wiring for an elevator annun-ciator does not differ greatly from thatof a simple annunciator; in fact, thescheme of connections is essentially thesame. A battery
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