Three-phase power
A steady balanced load. Not a cable size, discrimination study or motor-start check.
Method
P = √3 × V × I × pf. Worked case: 400 V, 32 A, pf 0.85 is 18.85 kW and 22.17 kVA.
Not BS 7671. See what this leaves out.
Logic: how this figure is built.
Last checked 2 October 2026. A scenario, not a design. See methodology, standards and the disclaimer.