1. What is an Electrical Load Calculator for Residential House?

Definition: This calculator estimates the total electrical load (in volt-amperes) for a residential house based on square footage, appliance circuits, and fixed appliances.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Load \) — Total electrical load (VA)
• \( Sq\ Ft \) — Home square footage
• \( Small\ Appliance \) — Number of small appliance circuits (typically 2)
• \( Laundry \) — 1500 VA if laundry circuit is present
• \( Fixed\ Appliances \) — Sum of fixed appliance loads (VA)

Explanation: The calculation follows NEC guidelines for residential service load calculations.

3. Importance of Electrical Load Calculation

Details: Proper load calculation ensures your electrical service can handle all appliances and prevents circuit overloads.

4. Using the Calculator

Tips: Enter your home's square footage, number of small appliance circuits (default 2), check if laundry circuit exists (default yes), and sum of fixed appliance loads.

5. Frequently Asked Questions (FAQ)

Q1: What's the 3 VA/sq ft factor?
A: This is the general lighting load requirement per NEC, calculated at 3 volt-amperes per square foot.

Q2: How many small appliance circuits are typical?
A: Most homes have at least two 20-amp small appliance circuits (3000 VA each) for kitchen and dining areas.

Q3: What counts as a fixed appliance?
A: These are permanently connected appliances like water heaters, HVAC systems, ranges, dryers, etc.

Q4: Should I include all appliances?
A: Include all major fixed appliances. Smaller plug-in devices are covered by the general lighting load.

Q5: How does this relate to service size?
A: Divide total VA by 240V to get amperage. Standard services are 100A, 150A, or 200A.