When sizing conductors, more is involved than just looking at Table 310.15(B)(16) in the National Electrical Code (NEC) and selecting a copper or aluminum conductor with the right ampacity. Of all the tables in Article 310, Table 310.15(B)(16) is referenced the most.
Jim Dollard has an extensive background in codes and standards. If you have a query about the National Electrical Code (NEC), Jim will help you solve it. Questions can be sent to firstname.lastname@example.org. Answers are based on the 2014 NEC. Type SE cable support