1. What is a Residential Electric Load Calculator?

Definition: This calculator estimates the total electrical load for a residential property based on square footage and fixed appliances.

Purpose: It helps homeowners and electricians determine the electrical service capacity needed for a home.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Load \) — Total electrical load in volt-amperes (VA)
• \( Sq\,Ft \) — Total living area square footage
• \( 3000 \) — Small appliance load (VA)
• \( 1500 \) — Laundry circuit load (VA)
• \( Fixed\,Appliances \) — Sum of fixed appliance loads (VA)

Explanation: The formula follows NEC guidelines for residential service calculations, with 3 VA per square foot for general lighting and receptacle loads.

3. Importance of Electrical Load Calculation

Details: Proper load calculation ensures your electrical service can handle all appliances simultaneously without overloading, preventing safety hazards and power issues.

4. Using the Calculator

Tips: Enter your home's total square footage and the sum of all fixed appliance loads (water heater, HVAC, etc.). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: Why 3 VA per square foot?
A: This is the NEC standard for general lighting and receptacle loads in residential spaces.

Q2: What's included in fixed appliances?
A: Permanent appliances like HVAC systems, water heaters, ranges, dryers, and other large fixed equipment.

Q3: Does this include future expansion?
A: No, consider adding 20% to the calculated load for future electrical needs.

Q4: How accurate is this calculation?
A: It provides a good estimate but consult an electrician for precise calculations, especially for large homes or unique situations.

Q5: What about electric vehicle chargers?
A: Add EV charger loads (typically 9,600 VA) to your fixed appliances total.