Modern Electrical Construction a Reliable Practical Guide for the Beginner in
The book Modern Electrical Construction a Reliable Practical Guide for the Beginner in was written by author Henry Charles Horstmann Here you can read free online of Modern Electrical Construction a Reliable Practical Guide for the Beginner in book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Modern Electrical Construction a Reliable Practical Guide for the Beginner in a good or bad book?
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125 "When possible, switches should be so wired that l/. Ades will be "dead" when switch is open. If knife switches are used in rooms where combustible flyings would, be likely to accumulate around them, they should be enclosed in dust-tight cabinets. (See note under No. 17 b. ) Even in rooms where there are no combustiblo materials it is better to put all knife switches in cabinets, in order to lessen the danger of accidental short circuits being made across their exposed metal parts by carele...ss workmen. Up to 250 volts and thirty amperes, approved indicating snap switches are advised in preference to knife switches on lighting circuits abcut the workrooms. To comply with this rule will ordinarily bring the fuses of knife switches directly under the handle of switch. If there happens to be a short circuit 0:1 the \vires when switch is closed the fuses will blow instantly and very li'. Iely burn the operator's hand. In connection with such switches cartridge fuses should be used or the switches, especially the larger ones, closed by O II Figure 70 Figure 71 pushing them in with a stick.
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