If, on the red phase, there is a 5k fresnel and a 2k fresnel, how many paper amps are on the red phase?

If, on the red phase, there is a 5k fresnel and a 2k fresnel, how many paper amps are on the red phase?

• A. 60
• B. 70
• C. 80
• D. 90

Answer: (B)

When sizing the current on a single phase, add up all the loads on that phase and convert to amps, then apply a safety factor for continuous lighting loads. The red phase has a 5 kW fixture and a 2 kW fixture, for a total of 7 kW. At a typical 120 V single-phase circuit, the current is 7000 W / 120 V = 58.3 A. Because lighting loads are treated as continuous, you multiply by 1.25 to account for continuous operation: 58.3 A × 1.25 ≈ 72.9 A. The closest practical value is about 70 A.

When sizing the current on a single phase, add up all the loads on that phase and convert to amps, then apply a safety factor for continuous lighting loads.

The red phase has a 5 kW fixture and a 2 kW fixture, for a total of 7 kW. At a typical 120 V single-phase circuit, the current is 7000 W / 120 V = 58.3 A. Because lighting loads are treated as continuous, you multiply by 1.25 to account for continuous operation: 58.3 A × 1.25 ≈ 72.9 A. The closest practical value is about 70 A.