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Motor Calculator

AS/NZS 3000:2018 + AS/NZS 1359 (Australian conditions)

✓ Phase 2 Calculator

Inputs

Typically 0.80–0.93

Typically 0.80–0.90

▶Cable & Environmental

Results

Full Load Current (FLC)

10.61

Amperes

Starting: 63.66 A

✅

Cable Current Capacity

17 A (>= 10.61 A)

✅

Voltage Drop (Running)

1.15 % (<= 5 %)

✅

Voltage Drop (Starting)

6.91 % (<= 15 %)

❌

Breaker Handles Starting Current

16 A (>= 63.66 A)

Cable Size1.5 mm²
Cable Capacity17 A
V-drop Running1.15%
V-drop Starting6.91%
Breaker16A (Curve D)
ContactorAC3 rated ≥ 12A
OverloadThermal overload 8.5–12.2A
Important: These results are indicative only. Motor circuits must be designed and verified by a qualified electrical engineer in accordance with AS/NZS 3000:2018 and AS/NZS 1359 before installation.

Motor Installation Guide — AS/NZS 3000:2018 + AS/NZS 1359

Motor circuits require careful design to ensure safe operation under both running and starting conditions. This calculator determines the full load current (FLC), starting current, cable size, breaker rating, and protection devices based on motor nameplate data and the selected starting method.

Motor Starting Methods

  • Direct-on-line (DOL): Highest starting current (5–7 × FLC), suitable for small motors on robust supplies. Requires curve D breaker.
  • Star-delta: Reduces starting current to ~2 × FLC. Requires switching equipment and reduced torque during start.
  • Soft-starter: Electronic control allows gradual acceleration, starting current ~3 × FLC. No torque loss.
  • Variable Frequency Drive (VFD): Soft acceleration, lowest starting current (~1.5 × FLC). Most efficient, enables speed control.

Disclaimer: These results are indicative only. All motor circuits must be designed and verified by a qualified electrical engineer in accordance with AS/NZS 3000:2018 and AS/NZS 1359 before installation. Motor starting must be coordinated with the supply authority if the motor is large (typically >7.5 kW).