1. What is Residential Panel Load Calculation?

The residential panel load calculation determines the total electrical load on a home's service panel. It follows NEC (National Electrical Code) guidelines to ensure safe and adequate electrical service sizing.

2. How Does the Calculator Work?

The calculator uses the standard residential load calculation formula:

Where:

• First 8000 VA — The initial 8000 VA of general lighting load is counted at 100%
• Remaining VA — Any general lighting load above 8000 VA is calculated at 40%
• Appliances — All appliance loads are added at 100%

Explanation: This calculation method accounts for diversity in residential electrical loads, recognizing that not all loads operate simultaneously at full capacity.

3. Importance of Panel Load Calculation

Details: Proper load calculation ensures the electrical service is properly sized to handle all connected loads without overloading, preventing potential fire hazards and equipment damage.

4. Using the Calculator

Tips: Enter the total general lighting load (all lighting and general-use receptacles) in VA and the total appliance load in VA. The calculator will apply the NEC demand factors automatically.

5. Frequently Asked Questions (FAQ)

Q1: What's included in general lighting load?
A: This includes all lighting circuits and general-use receptacles (typically 3VA per sq ft for dwellings).

Q2: What's included in appliance load?
A: This includes all fixed appliances (water heater, range, dryer, etc.) and any other dedicated appliance circuits.

Q3: Are there different demand factors for commercial?
A: Yes, commercial calculations use different demand factors and methods. This calculator is for residential only.

Q4: How does this relate to service size?
A: The total VA divided by your system voltage (typically 240V) gives the minimum ampacity required for your service.

Q5: Should I add a safety factor?
A: The NEC calculation already includes conservative demand factors. Additional safety margin is typically not needed.