International Library of Technology · Scranton, International Textbook Co. · leaf 153
incorrect result. However, it is about the only way wherethere is no available good wire and when the tests must bemade from one end only. The normal resistance of theline must be known from some previous measurement,unless it can be calculated from the length and size of the 15 ELECTRIC… … Fig. 40. with the distant end open, as in Fig. 40, and call this b ohms.Then the resistance x to the partial ground from the test-ing station is given by the following formula: x = c — \/{b — c) [a — c). (3.) By dividing x by the resistance per unit length of thewire, known from some previous…
Electrical engineering
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