1. What is Circuit Load Calculation?

Circuit load calculation determines the total current demand on an electrical circuit, including a 25% safety factor for continuous loads (those expected to last 3 hours or more).

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( Device\ Amps \) — Current draw of connected devices (amps)
• \( 1.25 \) — Safety factor for continuous loads

Explanation: The 1.25 multiplier accounts for the National Electrical Code requirement that continuous loads be derated by 25% for safety.

3. Importance of Load Calculation

Details: Proper load calculation ensures circuit breakers and wiring are appropriately sized to prevent overheating and potential fire hazards.

4. Using the Calculator

Tips: Enter the total current draw of all devices on the circuit in amps. The calculator will apply the 1.25 continuous load factor.

5. Frequently Asked Questions (FAQ)

Q1: What is a continuous load?
A: Any load that operates for 3 hours or more continuously, such as lighting, HVAC systems, or refrigeration equipment.

Q2: When is the 1.25 factor not needed?
A: For non-continuous loads (operating less than 3 hours continuously), you can use the actual amperage without the multiplier.

Q3: How does this relate to circuit breaker sizing?
A: The calculated load should not exceed 80% of the circuit breaker's rating for continuous loads.

Q4: What about motor loads?
A: Motors require additional considerations like locked rotor current and may need different calculation methods.

Q5: Can I add multiple devices?
A: Yes, sum the current of all devices on the circuit before entering the value.