How it works
Approximate resistive drop = 2 × current × length/1,000 × resistance × power factor.
Input definitions
- Load current (A)
- Enter the value in the labeled unit.
- One-way conductor length (m)
- Enter the value in the labeled unit.
- Conductor resistance (Ω/km)
- Enter the value in the labeled unit.
- Power factor
- Enter the value in the labeled unit.
A worked example
- Load current (A)
- 20
- One-way conductor length (m)
- 30
- Conductor resistance (Ω/km)
- 7.41
- Power factor
- 0.9
Assumptions & limits
Uses only the values entered. Rates are illustrative inputs, not live quotes, legal rules or personalised advice. Check provider terms, local requirements and measurements before acting.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-19. Content checked against the stated method and examples. Our verification approach.
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Common questions
Does this size a compliant cable?
No. It omits reactance, temperature correction, ampacity, installation method and local electrical rules.
How does Single-phase AC voltage drop calculate the result?
Approximate resistive drop = 2 × current × length/1,000 × resistance × power factor.
What should I verify before using Single-phase AC voltage drop?
Uses only the values entered. Rates are illustrative inputs, not live quotes, legal rules or personalised advice. Check provider terms, local requirements and measurements before acting.