According to the Code, what trade size EMT is required for each of the following combinations of conductors? Assume that these are new installations. Show all calculations. Refer to Chapter 9, NEC, Table 4, Table 5, and Table 8.
a. Three 14 AWG THHN, four 12 AWG THHN
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b. Two 12 AWG THHN, three 8 AWG THHN
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c. Three 3/0 AWG THHN, two 8 AWG THHN
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