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 205
ductors where enclosed fuses are used. Where link fusesor knife switches are used, the spacings must be at least asgreat as those required \)y Nos. 51 and 52. The spacings given in the second column apply to the dis-tance between the raised main bars, and between these bars andthe branch bars over… … 54. Cut-Out Cabinets. a. Material.—Cabinets must be siib- <^^antially constructed of non-combusti- 1 le, non-absorptive material, or of wood. When wood is use dth« inside of the cabi-t must be completely lined with a non-mbustible insulating material. Slate orarble at least one-quarter inch in…
Electrical engineering
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