You're reviewing electrical plans and notice a panel schedule shows a 200-amp main breaker with 40 circuits. The total connected load calculates to 320 amps. What principle allows this design?
Correct Answer
A) Load diversity factor
Load diversity factor (or demand factor) recognizes that not all electrical loads operate simultaneously at full capacity. Electrical codes allow for this diversity when calculating panel and service sizes, which is why the connected load can exceed the panel rating.
Why This Is the Correct Answer
Load diversity factor (demand factor) is the electrical engineering principle that recognizes not all electrical loads in a building operate simultaneously at their maximum rated capacity. The National Electrical Code (NEC) incorporates demand factors into load calculations, allowing designers to size electrical panels and services based on realistic usage patterns rather than theoretical maximum loads. This is why a 200-amp panel can safely serve circuits with a total connected load of 320 amps - because the actual demand will be significantly less due to the diversity of when different loads operate.
Why the Other Options Are Wrong
Option B: Power factor correction
Voltage drop compensation involves adjusting wire sizes or voltage levels to account for voltage loss over distance in electrical circuits. This has nothing to do with why total connected load can exceed the panel's amperage rating - it's a completely different electrical consideration.
Option C: Short circuit protection
Short circuit protection refers to overcurrent devices like breakers and fuses that protect against fault conditions. While the main breaker provides protection, it doesn't explain the load calculation principle that allows connected load to exceed panel capacity.
Memory Technique
Think 'DIVERSE DEMANDS' - in any building, electrical Demands are DIVERSE because different circuits operate at different times, so you don't need to size for everything running at once.
Reference Hint
NEC Article 220 - Branch-Circuit, Feeder, and Service Load Calculations, specifically sections on demand factors and load calculations
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