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trip voltage drop in cable for Round Calculator

Calculate cable voltage loss across the outgoing and return conductors. Enter the required values, adjust the options, and review the calculated result.

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Calculate cable voltage loss across the outgoing and return conductors. Enter the required values, adjust the options, and review the calculated result.

This tool runs open-source code from OmniTools (MIT License). See open-source credits.

trip voltage drop in cable for Round Calculator estimates round-trip cable voltage loss from current, length, area, and resistivity.

It returns the voltage drop from both outgoing and return conductors. The calculation runs in your browser. Processing runs in the browser.

Instructions

  1. Provide values for this tool.
  2. Enter current, cable length, area, and resistivity.
  3. Check that length describes one direction.
  4. Compare the result with the supply voltage.

Example

Input: current 10 A; length 20 m; area 2.5 mm²; resistivity 0.0175

Settings: trip voltage drop in cable for Round Calculator: Use the calculator's displayed electrical units.

Result: It returns the voltage drop from both outgoing and return conductors.

Limits

  • trip voltage drop in cable for Round Calculator: The formula includes a factor of two for the return path.
  • trip voltage drop in cable for Round Calculator: It does not check thermal ratings or protective devices.
  • trip voltage drop in cable for Round Calculator: It does not certify an installation.

Questions

What does this cable voltage-drop calculator calculate?

It estimates voltage drop from current, cable length, cross-sectional area, and resistivity. Its formula includes a factor of two for the outgoing and return path.

Why does wire area affect voltage drop?

Larger cross-sectional area reduces resistance in this model. The calculator converts the entered square-millimeter area before applying the resistivity formula.

Does this result verify that a cable installation is compliant?

No. It evaluates the displayed formula and does not check installation rules, thermal ratings, protective devices, or site conditions. Verify those requirements separately for the actual installation.