PRELIMINARY ENGINEERING TOOL
Voltage-drop calculator
Estimate receiving voltage with your selected cable data and design target.
Inputs
Equal parallel runs share the total entered current once. For an illustrative 10 mV/A/m, 20 A total and 50 m route, one run gives 10 V; two equal runs give 5 V. Do not also divide the entered current. Read the assumptions →
Calculation steps
ΔV = 1.732 × 25 × 0.045 × (0.72700 × 0.800 + 0.08 × 0.60000) / 1
Formula ID: VDROP_THREE_PHASE_RX_V2
One-way route length: 45 m.
Assumptions and references
Use conductor data for the circuit geometry and operating temperature being assessed. The selected target is a design input, not an automatic code limit.
How conductor temperature changes resistance and drop →What an mV/A/m value means →UNDERSTAND THE TOOL
What this calculator does
Estimate the voltage reduction between source and load with traceable conductor data and a clearly identified route length.
How to use it
- Choose a method supported by your conductor information.
- Enter one-way route length, load current and voltage.
- Enter custom R/X or mV/A/m data, or use the simplified resistivity estimate.
- Review percentage drop, end voltage, losses when available and warnings.
Fields and meanings
- One-way length
- Physical source-to-load route length.
- Current
- Expected operating current.
- Conductor data
- The impedance or mV/A/m value for the selected circuit geometry.
- Target
- A user-selected design target, not an automatic code limit.
Review required. Use traceable conductor data at the relevant operating temperature and installation condition.
Read the full explanation →