1. What is Copper Busbar Current Rating?

The copper busbar current rating is the maximum current that a copper busbar can carry continuously without exceeding its temperature rating. It's an important parameter in electrical power distribution systems.

2. How Does the Calculator Work?

The calculator uses the simplified formula:

Where:

• \( Width \) — Width of the busbar in millimeters (mm)
• \( Thickness \) — Thickness of the busbar in millimeters (mm)
• 1.2 — Empirical factor for copper busbars (A/mm²)

Explanation: The formula approximates the current carrying capacity based on the cross-sectional area of the busbar, with 1.2 A/mm² being a common design value for copper.

3. Importance of Current Rating Calculation

Details: Proper current rating calculation ensures busbars operate within safe temperature limits, preventing overheating and potential system failures.

4. Using the Calculator

Tips: Enter width and thickness in millimeters. Both values must be positive numbers. The result is given in amperes (A).

5. Frequently Asked Questions (FAQ)

Q1: Is this formula accurate for all busbar sizes?
A: This is a simplified formula. For precise calculations, consider factors like ambient temperature, enclosure, and busbar configuration.

Q2: What about aluminum busbars?
A: For aluminum, use a factor of about 0.8 A/mm² instead of 1.2 A/mm².

Q3: How does temperature affect the rating?
A: Higher ambient temperatures require derating. Consult standards like IEC 61439 for detailed derating factors.

Q4: What's the typical safety margin?
A: A 20-25% safety margin is often applied to the calculated rating for reliable operation.

Q5: How are multiple busbars handled?
A: For parallel busbars, the total current capacity is approximately the single bar rating multiplied by the number of bars, with a derating factor.