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DC Current Wire Size Calculator Online

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This tool simplifies the process of determining the optimal wire gauge needed for DC electrical circuits. By considering factors such as current, wire length, material, and desired voltage drop, the calculator provides accurate and reliable sizing recommendations.

Formula of DC Current Wire Size Calculator

To calculate the correct wire size, use the following formula:

DC Current Wire Size

  • I represents the current in amperes.
  • L is the total length of the wire in feet.
  • K stands for a constant, typically 12.9 for copper and 21.2 for aluminum.
  • VD is the voltage drop in volts.
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Steps to Use the Formula

Follow these steps to determine the appropriate wire size:

  1. Identify Current (I): Determine the amount of current that will flow through the wire.
  2. Measure Wire Length (L): Calculate the total length of the wire run.
  3. Choose the Constant (K): Select the constant based on the wire material (copper or aluminum).
  4. Define Voltage Drop (VD): Decide the maximum acceptable voltage drop.
  5. Calculate Wire Size: Use the formula to find the correct wire gauge.

Reference Table

Here is a quick reference table for commonly used wire sizes based on different currents and lengths for both copper and aluminum:

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Current (A)Length (ft)Copper Wire Size (AWG)Aluminum Wire Size (AWG)
10501614
20501412
30501210

Example of DC Current Wire Size Calculator

Consider a scenario where you need to install a wire that will carry 20 amperes over a distance of 100 feet using copper. The acceptable voltage drop is 3 volts. Using the formula:

Wire Size (AWG) = (20 * 100) / (12.9 * 3) ≈ 51.36

This calculation suggests using a wire gauge slightly larger than 51 AWG; however, since AWG sizes are standardized, you would round to the nearest available size.

Most Common FAQs

How does the choice of material affect the wire size?

Copper, having a lower resistance than aluminum, generally requires a smaller wire size for the same application.

What are the consequences of choosing an incorrect wire size?

Incorrect wire sizing can lead to excessive voltage drops, increased resistance, overheating, and potential fire hazards.

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