An electrical schedule shows a panel with a main breaker rated at 200A. If the connected load calculates to 160A, what is the load factor percentage?
Correct Answer
C) 80%
Load factor percentage = (connected load ÷ panel capacity) × 100. Therefore: (160A ÷ 200A) × 100 = 80%. This indicates the panel is operating at 80% capacity.
Why This Is the Correct Answer
Load factor percentage is calculated by dividing the connected load by the panel capacity and multiplying by 100. With a connected load of 160A and a panel capacity of 200A, the calculation is (160 ÷ 200) × 100 = 80%. This represents how much of the panel's total capacity is being utilized by the connected electrical loads. Understanding load factor is crucial for electrical system design and ensuring panels are not overloaded.
Why the Other Options Are Wrong
Option B: 90%
85% would result from incorrectly calculating 170A ÷ 200A, which doesn't match the given connected load of 160A.
Option D: 75%
90% would result from incorrectly calculating 180A ÷ 200A, which doesn't match the given connected load of 160A.
Memory Technique
Remember 'Load Factor = Load over Full capacity' - the fraction of capacity being used, always expressed as a percentage.
Reference Hint
National Electrical Code (NEC) Article 220 - Branch-Circuit, Feeder, and Service Load Calculations
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