Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets (1907)
Schneider, Norman H. (Norman Hugh), Hargrave, Jesse · New York, Spon & Chamberlain; [etc., etc.] · leaf 223
to point F. It sometimes happens thatthe end of the second crossed wire is not availablefor joining on to battery, and in this case the distantstation at which the wires have been looped is toldto ground the second crossed wire, and the batteryis then grounded as in Fig. 113. It should be bornein… … 11lfi^ ^ j> Fig. 113.The formula for this test is the same as given T E) on page 158, or, boiled down, it is simply F= —-— where F is resistance to the fault, L is resistanceof loop as per Fig. Ill, and R is result of measure-ment as per Fig. 112 or Fig. 113. The above is,of course, assuming…
Electric testing · Electric apparatus and appliances
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