Use current, one-way cable length, conductor material and allowed voltage drop to estimate a practical conductor cross-section.
Electrical & cable sizing ↗Voltage-drop estimate only. It does not verify current-carrying capacity, installation method, ambient temperature, grouping, fault protection, power factor/reactance or compliance with local wiring rules. Use a qualified electrical designer or electrician for final cable selection.
Estimated conductor area = circuit factor × resistivity × one-way length × current ÷ allowed voltage drop. The result is rounded up to the next common conductor size.
Reference values for sizing. Manufacturer ranges, tolerances and standard variants can differ; verify the product datasheet before ordering.