International Library of Technology · Scranton, International Textbook Co. · leaf 704
fig. 20. … 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 portion.If there are many rooms, it will be advisable to spliceon a length of No. 18 wire to extend from the…
Electrical engineering
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