Disclaimer: This post is for educational guidance. Always refer to the current AS/NZS 3008 standard and engage a qualified electrical engineer for final design decisions.
If you work in electrical design or installation anywhere in Australia or New Zealand, you know that AS/NZS 3008 is the bible for cable sizing. But let’s be honest—manually applying derating factors for temperature, soil thermal resistivity, grouping, and AC resistance can turn a simple job into a headache. cable sizing calculator as3008
Whether you choose a free online tool, a custom spreadsheet, or commercial software, make sure it’s based on the (currently 2017 with 2019 amendments). Standards update—your tools should too. Disclaimer: This post is for educational guidance
At 200A, 100m run, 95mm² Cu gives ~0.45 mV/A/m × 200A × 100m / 1000 = 9V drop (2.2% of 415V). Well within 5% limit. At 200A, 100m run, 95mm² Cu gives ~0
For a 10kA fault, 1s clearing time, 95mm² Cu easily withstands the temperature rise.
Select cable type, insulation, and installation method (buried – Table 4 or 5). Base current for 70mm² Cu XLPE is around 235A.
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