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 166
ased in metal, etc. This will not lessen theliability of such parts to ground, but lessens the chances LOW POTENTIAL SYSTEMS. 163 of short circuits very much. Many shorts are brought aboutby the projecting brass lamp butts on fixtures being of oppositepolarity. If they are of the same polarity,… … Figure 99 than the other, because of the edges of pipe in contact withthe wires. If very long fixtures of this kind are installed, it isadvisable to insert insulating joints as often as practicable,even if necessary to run wires around them. 27. Sockets. (For construction rules, see No. 3^.) a. In…
Electrical engineering
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