1. What Is Panel Load Calculation?

Panel load calculation determines the total electrical demand on a circuit panel by summing the connected loads multiplied by their demand factors. This ensures the panel is properly sized for safe operation.

2. How Does The Calculator Work?

The calculator uses the panel load equation:

Where:

• \( Circuits \) — Total connected load in volt-amperes (VA)
• \( Demand \) — Demand factor (decimal between 0 and 1)

Explanation: The demand factor accounts for the reality that not all connected loads operate simultaneously at full capacity.

3. Importance Of Load Calculation

Details: Proper load calculation prevents panel overloads, ensures code compliance, and maintains electrical system safety and reliability.

4. Using The Calculator

Tips: Enter total connected load in VA and appropriate demand factor. Typical demand factors range from 0.4 to 1.0 depending on load type and usage patterns.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between VA and watts?
A: VA (volt-amperes) is apparent power while watts is real power. For resistive loads they're equal, but differ for reactive loads.

Q2: How do I determine the demand factor?
A: Demand factors are specified in electrical codes (NEC) based on load type. Lighting typically uses 0.75-1.0, receptacles 0.5-0.8.

Q3: What's a typical residential panel load?
A: Modern homes typically have 100-200A service (24,000-48,000 VA at 240V) with actual loads around 60-80% of capacity.

Q4: When should I upgrade my panel?
A: When calculated loads exceed 80% of panel rating, or when adding significant new loads like EV chargers.

Q5: Are there different calculations for commercial panels?
A: Yes, commercial calculations often use different demand factors and may require more detailed load analysis.