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 135
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 a difference of potential greater than 220 volts can-not be found within any cut-out box, or at any switch… … Figure 77 more than one circuit. False ideas of economy should notinduce one to arrange large groups of lamps on one side ofthe system in order to save a few cut-out boxes. b. Must not be laid in plaster, cement, or similar finish,and must never be fastened with staples. LOW POTENTIAL SYSTEMS. 133…
Electrical engineering
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