Which statement about the air-conditioner unit is true regarding its minimum circuit ampacity on the nameplate?

Which statement about the air-conditioner unit is true regarding its minimum circuit ampacity on the nameplate?

• A. 32.0 A
• B. 37.9 A
• C. 60 A
• D. 45 A

Answer: (B)

The value being tested is the minimum circuit ampacity, which is the current the branch-circuit conductors must be able to carry for the air-conditioner under rated conditions, including startup surges. On the nameplate, this MCA is typically higher than the unit’s running current (full-load amps) because it accounts for temporary higher current during startup and the heat buildup the conductors must tolerate. For many HVAC units, MCA is about 125% of the full-load amperage, then rounded to a practical value shown on the nameplate. In this case, the MCA is 37.9 A, which is why that figure is the correct choice for the minimum circuit ampacity. The smaller 32.0 A would not provide enough headroom for startup and continuous operation, while the larger values (45 A or 60 A) reflect either larger conductor sizing or protection considerations beyond what this unit requires.

The value being tested is the minimum circuit ampacity, which is the current the branch-circuit conductors must be able to carry for the air-conditioner under rated conditions, including startup surges. On the nameplate, this MCA is typically higher than the unit’s running current (full-load amps) because it accounts for temporary higher current during startup and the heat buildup the conductors must tolerate. For many HVAC units, MCA is about 125% of the full-load amperage, then rounded to a practical value shown on the nameplate. In this case, the MCA is 37.9 A, which is why that figure is the correct choice for the minimum circuit ampacity. The smaller 32.0 A would not provide enough headroom for startup and continuous operation, while the larger values (45 A or 60 A) reflect either larger conductor sizing or protection considerations beyond what this unit requires.