Modern electrical construction; a reliable, practical guide for the beginner in electrical construction, showing the latest approved methods of installing work of all kinds according to the safety rules of the National board of fire underwriters (1905)
Horstmann, Henry C[harles], 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. J. Drake & Co. · leaf 128
ty amperes, approved indicatingsnap switches are advised in preference to knife switcheson lighting circuits about the workrooms. To comply with this rule will ordinarily bring the fusesof knife switches directly under the handle of switch. If therehappens to be a short circuit on the wires when… … Figure 70 Figure 71 pushing them in with a stick. The danger from opening aswitch is much less. Figure 70 shows a switch arranged to comply with all threepoints of this rule, the feed wires coming from below. Thisrequires that incoming and outgoing wires pass e-ach other.In this case, the wires…
Electrical engineering
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