PRELIMINARY ENGINEERING TOOL
Maximum cable length calculator
Estimate the maximum one-way route length for a user-selected voltage-drop target.
Inputs
Calculation steps
L = 6.900 × 1000 × 1 / (10 × 10)
Formula ID: MAX_LENGTH_SINGLE_PHASE_MV_V1
Assumptions and references
The result is governed only by the selected voltage-drop method. Ampacity, fault performance, installation method and equipment starting behavior remain separate checks.
UNDERSTAND THE TOOL
What this calculator does
Invert the voltage-drop relationship to find the route length at which the selected drop target is reached.
How to use it
- Choose the electrical system and conductor-data method.
- Enter voltage, current, power factor and the selected target.
- Enter traceable R/X or mV/A/m data, or use simplified resistivity.
- Treat the result as a preliminary route limit and review other cable constraints.
Fields and meanings
- Target drop
- The voltage-drop percentage selected for this assessment.
- Current
- Expected operating current.
- Parallel runs
- Equal current-sharing paths included once in the formula.
- Conductor data
- Custom impedance, mV/A/m or simplified material data.
Review required. Ampacity, fault performance, starting conditions, installation method and local requirements still require separate checks.
Read the full explanation →