1. What is the Kopperfield Load Calculator?

The Kopperfield Load Calculator is a tool for residential electrical load calculation using NEC defaults. It helps estimate total electrical load by considering appliance wattage and appropriate demand factors.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( Appliance\ Watts \) — Total wattage of all appliances
• \( Demand\ Factors \) — NEC-specified reduction factor (decimal between 0 and 1)

Explanation: The equation accounts for the fact that not all appliances run at full capacity simultaneously by applying demand factors.

3. Importance of Load Calculation

Details: Accurate load calculation is crucial for proper electrical system design, ensuring circuit breakers and wiring are appropriately sized for safety and efficiency.

4. Using the Calculator

Tips: Enter total appliance wattage in watts and the appropriate demand factor (decimal between 0 and 1). All values must be valid (watts > 0, demand factor between 0-1).

5. Frequently Asked Questions (FAQ)

Q1: What are typical demand factors?
A: NEC provides default demand factors (e.g., 100% of first 10kVA, 40% of remainder for residential).

Q2: How do I get total appliance watts?
A: Sum the nameplate ratings of all appliances or use standard NEC values for typical appliances.

Q3: When should I use this calculator?
A: For residential electrical service sizing, panel upgrades, or new construction planning.

Q4: Are there limitations to this calculation?
A: This is for standard residential applications. Commercial or industrial loads may require different methods.

Q5: Should I add a safety factor?
A: NEC already includes conservative factors, but local codes may require additional margins.