1. What is a House Electrical Load Calculator?

Definition: This calculator estimates the total electrical load of a residential property based on NEC (National Electrical Code) standards.

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Sq\,Ft \) — Living area square footage
• \( Small\,Appliance \) — Number of small appliance circuits (typically 2)
• \( Laundry \) — 1500 VA if laundry circuit is present
• \( Fixed\,Appliances \) — Sum of all fixed appliance loads

Explanation: The calculation follows NEC Article 220 requirements for dwelling unit load calculations.

3. Importance of Electrical Load Calculation

Details: Proper load calculation ensures safe electrical system design, prevents overloads, and helps determine appropriate service size.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why 3 VA per square foot?
A: NEC requires 3 VA/sq ft for general lighting and receptacle loads in dwelling units.

Q2: What counts as a small appliance circuit?
A: Circuits serving kitchen countertop receptacles and dining areas (minimum 2 required by NEC).

Q3: What are fixed appliances?
A: Permanent appliances like water heaters, HVAC systems, ranges, dryers, etc.

Q4: Does this include demand factors?
A: No, this is the total connected load before applying NEC demand factors.

Q5: How accurate is this calculation?
A: It follows NEC minimum requirements but consult an electrician for exact service sizing.