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 134
ust be strictly hroug-htup to all of the requirements of the rules at date. 24. Wires. GENERAL RULES. {See also Nos. 14, 15 and 16.) a. Must be so arranged that under no circumstances willthere be a difference of potential of over 300 volts between anybare metal parts in any distributing switch or… … Figure 76customary 110 volts on each side of the neutral, 220 volts areused, making a pressure of 440 volts between the two outside 132 MODERN ELECTRICAL CONSTRUCTION. The ordinary 110-220 volt, 3-wire S3^stem will require to bechanged at cut-out centers as shown in Figure 76, where itwill be seen…
Electrical engineering
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