Dc Cable Size Calculator

Introduction: Efficient power distribution in DC systems requires careful consideration of cable size to minimize voltage drop and ensure reliable performance. Our DC Cable Size Calculator simplifies this process by allowing you to input the current, distance, and maximum voltage drop, providing the recommended cable size in American Wire Gauge (AWG).

Formula: The recommended cable size is calculated using the formula: (2 * current * distance * voltage drop) / 1000. This formula ensures that the voltage drop remains within the specified limit for optimal system performance.

How to Use:

  1. Enter the current in Amperes.
  2. Input the distance the cable needs to cover in feet.
  3. Specify the maximum allowable voltage drop as a percentage.
  4. Click the “Calculate” button to obtain the recommended cable size in AWG.

Example: For a DC system with a current of 20 Amperes, a distance of 50 feet, and a maximum voltage drop of 3%, the calculator will recommend a certain cable size in AWG.


  1. Q: Why is cable size important in DC systems? A: The cable size affects the voltage drop, and choosing the right size ensures efficient power distribution and system performance.
  2. Q: What is voltage drop, and why should it be limited? A: Voltage drop is the reduction in voltage along the length of a cable. Limiting it ensures that devices receive the required voltage for proper operation.
  3. Q: Can I use this calculator for AC systems? A: No, this calculator is specifically designed for DC systems. AC systems have different considerations for cable sizing.
  4. Q: How do I determine the maximum allowable voltage drop? A: The maximum allowable voltage drop is typically specified by the equipment manufacturer or industry standards. Common values range from 1% to 5%.
  5. Q: What happens if I use a smaller cable than recommended? A: Using a smaller cable may result in higher voltage drop, leading to reduced efficiency and potential damage to connected devices.

Conclusion: The DC Cable Size Calculator is an invaluable tool for electricians, engineers, and anyone involved in designing or maintaining DC power systems. By providing a precise measurement of the recommended cable size, this calculator contributes to efficient and reliable power distribution. Happy calculating!

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