Voltage drop.
Round trip math. The 2 multiplier on single phase comes from current going out and coming back. K = 12.9 for copper, 21.2 for aluminum. CM from Chapter 9 Table 8.
Uses K=12.9 for copper, K=21.2 for aluminum, from NEC Chapter 9 Table 8. Some prep books use different K values. Numbers may differ slightly.
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