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 145
y on separatetimbers or studdings. Must be separated from contact withthe walls, floor timbers and partitions through which they maypass by non-combustible, non-absorptive insulating tubes, suchas glass or porcelain. Rig-id supporting requires under ordinary conditions, wherewiring- along- flat… … • Figure 90 practicable to place any circuit on non-combustible supportsof glass or porcelain, approved metal conduit, or approvedarmored cable must be used (see No. 24 t) except that if thedifference of potential between the wires is not over 300 volts,and if the wires are not exposed to moisture,…
Electrical engineering
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