How it works
Drop = √3 × current × length/1,000 × (R × PF + X × √(1−PF²)).
Input definitions
- Line current (A)
- Enter the value in the labeled unit.
- One-way length (m)
- Enter the value in the labeled unit.
- Resistance (Ω/km)
- Enter the value in the labeled unit.
- Reactance (Ω/km)
- Enter the value in the labeled unit.
- Power factor
- Enter the value in the labeled unit.
A worked example
- Line current (A)
- 60
- One-way length (m)
- 100
- Resistance (Ω/km)
- 0.5
- Reactance (Ω/km)
- 0.08
- Power factor
- 0.85
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
Why include reactance?
Long AC feeders and larger conductors can have material reactance, especially at lower power factor.
How does Three-phase AC voltage drop calculate the result?
Drop = √3 × current × length/1,000 × (R × PF + X × √(1−PF²)).
What should I verify before using Three-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.