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 138
5 SPECIAL RULES. For Open Work. In dry places. g. Must have an approved rubber or slow-burning weath-erproof insulation (see Nos. 41 and 42.) A slow-burning weatherproof covering is considered goodenough where the wires are entirely on insulating supports.Its main object is to prevent the copper… … Figure 79 perature found in most mill rooms in summer. This is objec-tionable, especially in linty places, as dust and flyings readilyadhere to the wires, making it difficult to keep them clear.Under these conditions, the sweeping-down process generallyresults in loosening and deranging the wires…
Electrical engineering
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