AS/NZS 3008 is not just a compliance hurdle; it is an engineering tool that prevents overheated cables, nuisance tripping, and fire hazards. Always use the latest version (currently AS/NZS 3008.1.1:2017 including Amendments) and consult the standard directly for your specific conditions.
A 16 mm² XLPE copper cable in free air at 30°C might carry 125 A. But if you: as3008 cable selection
The effective capacity = 125 × 0.80 × 0.70 = – almost half the original value. Ignore derating, and your cable will overheat. AS/NZS 3008 is not just a compliance hurdle;
The calculation is defined as: $$V_d = \fracL \times I \times V_c1000$$ Where: as3008 cable selection