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 63
ule 13 A must be provided with reliableground detectors. Detectors which indicate continuously and 60 MODERN ELECTRICAL CONSTRUCTION. give an instant and permanent indication of a ground arepreferable. Ground wires from detectors must not be at-tached to gas pipes within the building. b. Where… … 11—m—IT ® t 8 III n DT Qtound Figure. 28 ammation by the Inspection Department having jurisdiction. These rules on testing to be applied to such places as maybe designated by the Inspection Department having- jurisdic-tion. The exceptions to this rule are 3-wire direct current sys-tems where the…
Electrical engineering
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