Two independent checks
The conductor must carry the load current and keep voltage drop within the chosen limit.
Real installations also require derating for ambient temperature, grouping, installation method and protective-device coordination.
Cables
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Cable Sizing Calculator
Educational cable-size estimate from current and voltage-drop limits.
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This tool illustrates the two constraints — ampacity and voltage drop — and is not a certified design.
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Assumptions and limits.
- Educational estimate only. Ampacity values are indicative and do not replace the applicable wiring standard, installation method, grouping, ambient temperature or derating factors.
Frequently asked questions
Can I use this result for a real installation?
No. It is educational. A qualified electrician must size and verify the installation against the applicable standard.