1. What is Service Panel Load Calculation?

The service panel load calculation determines the total electrical demand on a building's main service panel by summing up the general lighting/appliance load, dedicated appliance circuits, and HVAC equipment load.

2. How Does the Calculator Work?

The calculator uses the basic load summation formula:

Where:

• General Load — Lighting and general use receptacles (VA)
• Appliances Load — Dedicated appliance circuits (VA)
• HVAC Load — Heating, ventilation, and air conditioning equipment (VA)

Explanation: This simple summation provides a basic estimate of the total electrical load on the service panel.

3. Importance of Load Calculation

Details: Accurate load calculations are essential for proper sizing of electrical service panels, ensuring safe operation of electrical systems, and compliance with electrical codes.

4. Using the Calculator

Tips: Enter each load component in volt-amperes (VA). For more detailed calculations, consult the National Electrical Code (NEC) requirements.

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 for reactive loads VA will be higher.

Q2: How do I get the general load value?
A: General load is typically calculated as 3VA per square foot for lighting and general receptacles.

Q3: Should I include all appliances?
A: Include only major appliances with dedicated circuits (refrigerator, dishwasher, etc.).

Q4: What about demand factors?
A: This simple calculator doesn't apply demand factors. For accurate calculations, consult NEC demand factor tables.

Q5: How much margin should I add?
A: Electrical codes typically require 25% margin for continuous loads (operating 3+ hours continuously).