Cable Size Calculator
Compare reference ampacity and voltage drop for preliminary cable selection.
These estimates are for preliminary planning. Verify the design against local codes, installation conditions and protection coordination.
Preliminary / reference only
Calculation Basis
The single-circuit reference uses 70°C PVC and three loaded conductors, including for single-phase estimates. Conduit is B2, clipped direct and unperforated tray are C, and buried ducts are D1 using soil temperature. Check grouping, harmonics, short-circuit withstand and soil thermal resistivity separately.
Electrical Installation Guide · G12 / G13 / G20 · Estimated Voltage Drop