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EV Charger Cable Sizing Calculator

AS/NZS 3000:2018 + AS/NZS 3001.1

✓ 2018 Standard⚡ Phase 2

Inputs

▶Advanced options

Default: 40°C (PVC 75°C cable)

AS/NZS 3000:2018 default is 5%

For circuits < 2.4 kW sharing

Results

Recommended Cable Size

6

mm²

Capacity: 40A

Charger Current32.2 A
Recommended Breaker40 A
RCD Type RequiredType A
Voltage Drop3.1% (7.13V)
Dedicated Circuit RequiredYes
✅

Breaker Rating ≥ Charger Current

40 A (>= 32.2 A)

✅

Cable Current Capacity

40 A (>= 32.2 A)

✅

Voltage Drop

3.1 % (<= 5 %)

✅

Dedicated Circuit Required

1 (>= 1 )

✅

RCD Protection

1 (>= 1 )

Important: These results are indicative only. EV charger installations must comply with AS/NZS 3000:2018 and AS/NZS 3001.1. Do not use for final design without independent verification from a licensed electrical contractor.

EV Charger Installation Guide — AS/NZS 3000:2018

EV chargers require dedicated circuits with appropriate cable sizing, circuit breaker protection, and RCD protection. This calculator determines the correct cable size based on charger rating, supply phase, and cable length.

The calculation accounts for voltage drop (5% limit per AS/NZS 3000 Cl. 3.6), current-carrying capacity, temperature derating, and installation method to ensure safe and compliant installation.

Disclaimer: This calculator is a guide only. Always verify with the current standards and consult a qualified electrical engineer.