Electrical Load Calculator
Understanding Electrical Load Calculations
Continuous vs. Non-Continuous Loads
Continuous Load: A load where the maximum current is expected to continue for 3 hours or more. The NEC requires these loads to be calculated at 125% of their rated current.
Non-Continuous Load: A load where the maximum current is expected for less than 3 hours. These are calculated at 100% of their rated current.
Load Calculation Formula
Total VA = (Continuous Load × 1.25) + Non-Continuous Load Amperage = Total VA / VoltageCommon Appliance Wattages
- LED Light Bulb: 10-15W
- Refrigerator: 150-400W
- Microwave: 800-1200W
- Toaster: 800-1500W
- Electric Stove: 3000-8000W
- Central AC (3 ton): 3500W
- Electric Water Heater: 4500-5500W
- Clothes Dryer: 1800-5000W
- Dishwasher: 1200-1500W
- Washing Machine: 500-900W
Frequently Asked Questions
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