I want to install a...
All cable selections in Australia must reference (Electrical installations – Selection of cables). This standard provides tables that adjust current ratings based on:
Most residential wiring in Australia uses , measured by the cross-sectional area (CSA) of the copper conductors in square millimetres (mm²). Cable Size (mm²) Common Application Typical Breaker Size Indicative Current Capacity 1.0 mm² Small lighting runs, low-load switches 10A – 14A 1.5 mm² Standard lighting circuits 10A or 16A 14A – 18A 2.5 mm² General Power Outlets (GPOs) 18A – 24A 4.0 mm² Air conditioners, water heaters 25A or 32A 24A – 32A 6.0 mm² Electric stoves, large A/C units 32A or 40A 32A – 40A 10.0 mm² Main incoming lines, small industrial 50A or 63A 50A – 63A 16.0 mm² Service mains for large homes 80A – 100A Key Factors for Cable Selection Cable Size Calculator AS/NZS 3008 | jCalc.net
When in doubt: The cost difference between 2.5mm² and 4mm² for a 30m run is about $30. The cost of burning out your pump, air conditioner, or starting a fire is thousands. cable sizes australia
The ratings listed above (e.g., 20 Amps for 2.5mm) are for "ideal conditions." However, cables get derated (lowered capacity) based on their environment:
: The go-to size for general power circuits and standard power points .
If you are wiring up a shed, a granny flat, or running power to a pool pump, standard power cables won't cut it. I want to install a
Two physical laws govern cable sizing:
For heavy-duty applications like winches or battery starters, Australia uses , which is effectively identical to AWG (American Wire Gauge) .
This guide outlines the standard cable sizing systems used in Australia to help you choose the right wiring for residential and automotive projects. Understanding Cable Sizes in Australia: A Complete Guide Cable Size (mm²) Common Application Typical Breaker Size
You can install a 2.5mm² cable rated for 20 amps, but if you run it 80 meters to a shed, your tools will overheat and fail.
Here is everything you need to know about choosing the correct cable size for your job.
If you search for cable online, you might see cheap cables labeled as or 5mm .