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 82
ctures are frequently found which are too lowor much too lig-ht for the work, or which have been carelessly OUTSIDE WORK 79 put up. A structure which is to hold the wires a properdistance above the roof in all kinds of weather must not onlybe of sufficient height, but must be substantially… … Figure 39 cause much trouble. The rule requires that wires be 7 feetabove flat roofs, and roof structures must, therefore, be madehigh enough to allow for sag. In moderately long runs2 or 3 feet will be sufficient. For long runs, see following table,taken from construction rules of Commonwealth…
Electrical engineering
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