1. What is Commercial Electrical Load Calculation?

Commercial electrical load calculation determines the total power requirements for a commercial building. It's essential for proper electrical system design, ensuring adequate capacity and compliance with electrical codes.

2. How Does the Calculator Work?

The calculator uses the standard commercial load equation:

Where:

• \( Sq\ Ft \) — Total square footage of the commercial space
• \( VA/ft² \) — Volt-amps per square foot (typically 3-5 VA/ft² for general office space)
• \( Equipment \) — Additional load from specialized equipment in volt-amps

Explanation: The calculation accounts for both the general lighting/power load (based on area) and any additional equipment loads.

3. Importance of Load Calculation

Details: Accurate load calculations prevent circuit overloads, ensure proper equipment sizing, and maintain compliance with NEC (National Electrical Code) requirements.

4. Using the Calculator

Tips: Enter the total square footage, typical VA/ft² for your space type, and sum of all equipment loads. All values must be non-negative.

5. Frequently Asked Questions (FAQ)

Q1: What are typical VA/ft² values?
A: Office spaces: 3-5 VA/ft², Retail: 3-6 VA/ft², Restaurants: 6-8 VA/ft², Hospitals: 8-10 VA/ft².

Q2: How to determine equipment load?
A: Sum the nameplate ratings of all equipment that will operate simultaneously.

Q3: Does this include HVAC load?
A: HVAC is typically calculated separately and added to the total load.

Q4: What about demand factors?
A: This calculator provides the connected load. For service sizing, demand factors from NEC Table 220.42 should be applied.

Q5: Is this calculation NEC compliant?
A: This provides a basic estimate. Final designs should follow NEC Article 220 for complete compliance.