voltage drop calculator

Voltage Drop Calculator For Feeders, Busway, And Power Runs

Check preliminary voltage drop from load current, voltage, route length, conductor material, conductor size, and target drop.

BuswayPDULV SwitchgearMV SwitchgearRFQ estimate

Answer First

A voltage drop calculator flags whether a long feeder, busway run, or distribution route may need larger conductors, a shorter route, or a different voltage level before suppliers quote equipment.

Interactive estimators

RFQ-ready sizing prechecks

Use these as procurement estimates for early supplier discussions. Final design, protection, code compliance, and manufacturer selection still need qualified engineering review.

Load current

Line voltage

One-way run length

Conductor size

kcmil

Target drop

Busway / feederGood

4.5 V

Voltage drop

0.9%

Drop percentage

475.5 V

Remaining voltage

Target

Use in RFQ

Results are estimates for supplier conversations, not final equipment selection.

Inputs To Have Ready

Load current

Line voltage

One-way route length

Conductor material

Conductor size and target drop

Outputs For The RFQ

Voltage drop in voltsDrop percentageRemaining voltageGood or review statusRoute assumptions for supplier discussion

Calculator FAQ

Visible answers are mirrored into FAQPage schema for search snippets.

What voltage drop target should buyers use?

Many early checks use a target around 3%, but acceptable limits depend on local code, equipment tolerance, installation method, and project standards.

Can voltage drop change the equipment shortlist?

Yes. Long routes can influence busway, cable, transformer location, distribution voltage, switchgear, and PDU decisions.

What should be reviewed after a warning result?

Review conductor size, route length, temperature, installation method, parallel runs, upstream voltage, and whether the layout should move equipment closer to load.