Voltage Drop Calculator
The Voltage Drop Calculator finds the percentage voltage drop on a cable run and checks it against the PEC/NEC limit. Example: for a 60 A 3-phase feeder over 45 m of 25 mm² copper cable at 400 V, Voltage drop = 0.98 %, Drop = 3.92 V, Limit = 3 % (per PEC 2017 Art. 2.10.19 | NEC 210.19).
How it works
Computed from your inputs per PEC 2017 Art. 2.10.19 | NEC 210.19.
Worked example (Electrical & Power)
Inputs: a 60 A 3-phase feeder over 45 m of 25 mm² copper cable at 400 V.
| Result | Value |
|---|---|
| Voltage drop | 0.98 % |
| Drop | 3.92 V |
| Limit | 3 % |
Computed live by WorkHive's calculation engine; standard: PEC 2017 Art. 2.10.19 | NEC 210.19.
How to use this calculator
- Enter the figures for the duty you are sizing: the worked example below uses a 60 A 3-phase feeder over 45 m of 25 mm² copper cable at 400 V.
- The calculator returns Voltage drop, Drop, Limit, computed per PEC 2017 Art. 2.10.19 | NEC 210.19.
- Check the worked example to confirm the method matches how you would do it by hand, then run your own numbers in the interactive tool.
FAQ
What is a voltage drop calculator cable PEC?
The Voltage Drop Calculator is a free online tool that computes finds the percentage voltage drop on a cable run and checks it against the PEC/NEC limit. It shows the formula and a fully worked example so you can check the method, not just the number.
How is it calculated?
The result is computed from your inputs following PEC 2017 Art. 2.10.19 | NEC 210.19. The worked example on this page shows a real computation with real numbers.
Is the calculator free?
Yes. WorkHive's engineering calculators are free to use, no sign-up needed for the tools. WorkHive is a free, offline-first maintenance platform built for Philippine industrial plants.
Run it on your own numbers
Open the interactive Voltage Drop Calculator in WorkHive: free, no sign-up needed for the calculators.