Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 240
Fig. 12. Varley Loop Test. — Measure resistance of looped cable or conduc-tors as before. Then connect, as shown in Fig. 13, in which ris an adjustableresistance. Obtain false zero as before. Then close key K, and adjust r forbalance. In testing, when earth current is present, the best results… … where x is the distance of fault, in ohms, from point 2 of cable proper. Then x -f- by the resistance of the cable or conductor per knot or milegives the distance of fault in knots or miles. Locating- faults in Insulated Wires. — The following, so tospeak, rule of thumb, or point to point…
Electrical engineering
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