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 137
, because of the precautions which would benecessary to secure proper insulation if the pipe were used.With these exceptions, however, iron pipe is considered prefer-able to the wooden boxing, and its use is strongly urged. Itis especially suitable for the protection of wires near belts, pul-leys,… … Figure 78 Figure 78 illustrates the meaning of the rule in regard towires run along low ceilings. Figure 79 gives the dimensions necessary for boxing wireson side walls. At the right, the sidewall protection consistsof conduit; a junction box with the lower side knocked out isused to enclose…
Electrical engineering
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