Solution Problem 13-11:Given: 100 hp, 460 V, 60 hz, 120 A motora. Find the required wire size. The NEC only allows us to use 80% of the stated ampacity in table 310.16; therefore, the motorcurrent must be increased to 125% (the inverse of 0.8). Further, the motor current must beobtained from table 430.150. From that table, the motor current full load amps (FLA) is 124 A.Required ampacity = 1.25 * 124 A = 155 AFrom table 310.16, using copper wire, we will need a 3/0 if 60 insulation is used, a 2/0 if 75oo
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