Which table addresses full load current for 3Ø motors?

Which table addresses full load current for 3Ø motors?

• A. NEC Table 220.47
• B. NEC Table 220.41
• C. NEC Table 430.251
• D. NEC Table 430.250

Answer: (D)

The key idea is where to find the amperage value used to size motor feeders and protection. For three-phase motors, the full-load current (FLC) is published in NEC motor data tables, and the specific table that lists the FLC for motors is Table 430.250. You look up the motor’s horsepower and voltage in that table to get its FLC in amperes, then use that value to size conductors and overcurrent protection accordingly. The other tables cover different kinds of loads or motor details that aren’t the direct source for the motor’s full-load current.

The key idea is where to find the amperage value used to size motor feeders and protection. For three-phase motors, the full-load current (FLC) is published in NEC motor data tables, and the specific table that lists the FLC for motors is Table 430.250. You look up the motor’s horsepower and voltage in that table to get its FLC in amperes, then use that value to size conductors and overcurrent protection accordingly. The other tables cover different kinds of loads or motor details that aren’t the direct source for the motor’s full-load current.