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 111
NT-CURRENT SYSTEMS. 18. Wires. PRINCIPALLY SERIES ARC LIGHTING. (See also Nos. 14, 15 and 16.) a. Must have an approved rubber insulating covering (seeNo. 41). h. Must be arranged to enter and leave the buildingthrough an approved double-contact service switch (see No.51 &), mounted in a… … Figure 57trated at d, Figure 57, is provided where wires enter andleave the building. A modern commercial form of this switchis shown in Figure 58. This switch never breaks the circuit.As shown in Figure 57, the current passes from the positivepole, through the upper blade of the switch to h and…
Electrical engineering
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