1. What is the Cable Size Calculation?

The cable size calculation determines the appropriate conductor size for electrical service entrance cables based on the load current and the cable's ampacity rating. This ensures safe operation without overheating.

2. How Does the Calculator Work?

The calculator uses the cable size formula:

Where:

• \( \text{Load Amps} \) — Total current demand of the electrical load (amps)
• \( \text{Ampacity} \) — Current-carrying capacity of the cable (amps)

Explanation: The formula calculates the required cable size ratio to safely handle the electrical load.

3. Importance of Proper Cable Sizing

Details: Correct cable sizing is critical for electrical safety, preventing overheating, voltage drop issues, and ensuring compliance with electrical codes.

4. Using the Calculator

Tips: Enter the total load current in amps and the cable's ampacity rating. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is ampacity?
A: Ampacity is the maximum current a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

Q2: How do I determine the load amps?
A: Load amps can be calculated by summing the current requirements of all connected devices or by using the service panel rating.

Q3: What factors affect ampacity?
A: Ampacity depends on conductor material, insulation type, ambient temperature, and installation method.

Q4: What's the typical ampacity for service entrance cables?
A: For 200 amp service, common cable sizes are 2/0 or 3/0 AWG copper or 4/0 AWG aluminum, but always check local codes.

Q5: Should I round up the calculated cable size?
A: Yes, always round up to the next standard cable size to ensure safety margins.