AS/NZS 3008 Cable Sizing Summary Guide (PDF)

AS/NZS 3008.1.1:2017 is the primary cable sizing standard for Australian and New Zealand electrical engineers — but at 200+ pages, it is not a quick reference. This 2-page A4 landscape summary distils the cable sizing methodology into a step-by-step workflow: determine design current, select protective device, identify installation method (Table 3), look up base current rating (Tables 13–16), apply derating factors (ambient temperature Table 22, grouping Table 25, soil resistivity Table 27, depth of burial Table 28), verify voltage drop (Clause 4), and check earth fault loop impedance. Each step includes the exact table and clause references. Print and keep at your desk for the 80% of cable sizing tasks that follow the standard workflow.