An electrical schedule shows a 200-amp panel with a demand factor of 75%. What is the calculated electrical demand for this panel?
Correct Answer
C) 150 amps
The electrical demand is calculated by multiplying the panel rating by the demand factor: 200 amps × 0.75 = 150 amps demand.
Why This Is the Correct Answer
The electrical demand is calculated by applying the demand factor to the panel's rated capacity. When a 200-amp panel has a 75% demand factor, you multiply 200 amps × 0.75 to get 150 amps. This represents the actual expected electrical load on the panel, which is typically less than the full rated capacity due to the fact that not all circuits operate at maximum load simultaneously.
Why the Other Options Are Wrong
Option B: 175 amps
125 amps would result from incorrectly using a 62.5% demand factor (200 × 0.625 = 125), which is not the given demand factor of 75%.
Option D: 200 amps
200 amps represents the full panel rating without applying any demand factor, which ignores the given 75% demand factor requirement.
Memory Technique
Remember 'Demand = Rating × Factor' - think of it as 'what you actually need (demand) equals what's available (rating) times how much you'll really use (factor)'
Reference Hint
Florida Building Code, Chapter 22 (Electrical) or NEC Article 220 (Branch-Circuit, Feeder, and Service Load Calculations)
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