Electrical & Drives · Energy, APFC & Power Quality
Preliminary Cable Screening & Voltage Drop Calculator
Calculate AC voltage drop and receiving voltage from project-specific conductor R/X data.
This tool provides a preliminary engineering calculation for reference. Final equipment selection, design and commissioning decisions must consider manufacturer data, applicable standards, operating conditions and project-specific engineering requirements. It is not certified design output.
Preliminary result
Calculated outputs
Enter values and select Calculate. Results are estimates and do not replace nameplate data, applicable standards, or an engineering review.
Use this calculation
Only calculator parameters and results are transferred. Personal details are collected separately in the destination form.
Formula
Three phase: ΔV = √3 I L(R cosφ + X sinφ)
Single phase: ΔV = 2 I L(R cosφ + X sinφ)
Worked example
100 A, 415 V, three-phase, 100 m, PF 0.85, R 0.387 Ω/km and X 0.08 Ω/km.
Expected check: Voltage drop = 6.42.
Assumptions
- • R and X are entered at the applicable conductor temperature and frequency
- • Balanced steady-state load
Limitations
- • Preliminary Cable Screening only—not Final Cable Selection
- • Final design also requires current-carrying capacity, installation method, ambient temperature, grouping, conductor temperature, voltage drop, short-circuit withstand, protective-device coordination, and applicable standards/project rules
Frequently asked questions
Can this result be used for final equipment selection?
No. Use it for a preliminary check, then verify manufacturer data, site conditions, applicable standards and the complete system design.
What does formula version 1.0.0 mean?
It identifies the exact calculation logic used so a saved result can be traced when the formula register changes.
Can Elexorn review my calculation?
Yes. Transfer the result to Request a Quote or Talk to an Elexorn Engineer and add the relevant project or equipment details.