AS/NZS 3008
Cable Sizing Calculator
Size cables for current carrying capacity, voltage drop, and short circuit withstand per AS/NZS 3008.
Open calculator →
Professional-grade tools for cable sizing, voltage drop, maximum demand, and more — built to AS/NZS, IEC, and IEEE standards.
Every calculator is built with current Australian and international electrical standards at its core. Verify your designs with confidence.
View all tools →Select a tool to get started. Each calculator provides detailed results, reference tables, and standards citations.
Size cables for current carrying capacity, voltage drop, and short circuit withstand per AS/NZS 3008.
Calculate maximum demand for residential and commercial installations using AS/NZS 3000 methods.
Calculate voltage rise for solar PV and generator installations to ensure compliance with grid connection limits.
Calculate voltage drop for AC and DC circuits — verify compliance with AS/NZS 3000 allowable limits.
Full-load currents, turns ratio, impedance, voltage regulation, and efficiency calculations.
Prospective fault currents on transformer secondary — 3-phase, phase-to-phase, and earth faults.
Size battery banks for DC systems — lead-acid and lithium-ion with temperature and aging corrections.
Sub-transient, transient, and steady-state fault currents for protection coordination.
Inverse definite minimum time relay operating times — IEC and IEEE overcurrent curves.
Incident energy, PPE category, and arc flash boundary per IEEE 1584-2018.
Fault level calculations for LV and HV systems including symmetrical and asymmetrical fault currents.
Time-current grading for fuses, MCBs, MCCBs, and relay coordination across protection zones.
Ampacities is the digital tools platform by Ampacities Expert Engineering (AEE), a specialist electrical engineering consultancy. AEE delivers design, analysis, and advisory services across power systems, protection coordination, and high-voltage infrastructure.
We build professional-grade electrical engineering calculators designed for practising engineers. Every tool is grounded in current Australian and international standards, with transparent formulas and step-by-step workings you can verify.
More calculators are actively in development — including motor starting, earthing design, power factor correction, and protection coordination.
Have a suggestion for a new calculator, found a bug, or want to discuss a standards question?