NM CID EL-1 Practice Questions - New Mexico CID EL-1 Electrical Distribution Systems, Including Transmission Lines Examination Exam

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A 69 kV effectively grounded wye transmission line crosses a public road. NESC 2007 Rule 232B1 requires Table 232-1 clearances to be increased 0.4 inch for each kilovolt over 22 kV to ground. Using Vlg = 69 / 1.732 = 39.8 kV, what is the approximate required roadway clearance for open supply conductors?

18.5 feet 19.1 feet 22.0 feet 26.5 feet

Correct Answer:

19.1 feet

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