Cable Size Calculator Instant

Conductors have a specific "ampacity"—the maximum current they can carry continuously without exceeding their temperature rating. Overloading a thin wire generates excessive heat, which is the leading cause of electrical fires.

⚠️ Always verify results with local electrical code tables.

For 30 A, assume 4 mm² Cu PVC has 37 A rating. cable size calculator

Most regions require adherence to strict standards, such as the National Electrical Code (NEC) in the US, BS 7671 in the UK, or AS/NZS 3000 in Australia. How a Cable Size Calculator Works ELEK Cable Pro Software

(dominated by voltage drop, not ampacity). For 30 A, assume 4 mm² Cu PVC has 37 A rating

: Useful for estimating voltage drop and labor costs for US-standard installations.

To size a cable, you need:

min_area_mm2 = (2 * current_amps * length_meters * resistivity) / v_drop_max_volts