Fill in the blank with the appropriate answer.
For field-fabricated installations using equipment operating at more than 600V, the minimum air separation between live conductors and between such conductors and adjacent grounded surfaces shall be a minimum of______ in. for an indoor, phase-to-phase application of 13.8kV.
A. 12
B. 7.5
C. 7
D. 5
Answer: B...
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