Cable Calculator Australia New! -

A cable calculator helps you determine the required for a specific circuit.

Always cross-reference the calculator's result with the actual tables in the Standards, especially for complex commercial or industrial installations.

This ensures that if a short circuit or earth fault occurs, the circuit breaker or fuse will trip fast enough to prevent electric shock. The calculator checks if the cable length is too long to allow the breaker to trip. cable calculator australia

Many apprentices and DIYers size cables based purely on (Amps).

20A load, 50m cable, 2.5mm² copper → voltage drop ≈ 14.8V (6.4%) → too high → need 6mm². A cable calculator helps you determine the required

Would you like a step‑by‑step example using a specific online calculator?

Do not confuse standard TPS (V-90) with XLPE (X-90). The calculator checks if the cable length is

Electricity loses pressure (voltage) as it travels over distance. In Australia, the general rule (per AS/NZS 3000) is that voltage drop should not exceed of the nominal voltage (or sometimes less for sensitive equipment).

The primary goal of cable sizing is to ensure safety and efficiency. A cable that is too small for the load will overheat, potentially causing a fire or melting the insulation. A cable that is too large is a waste of money.

Several cable calculators are available online for use in Australia, including: