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Worked examples that cite the clause and open pre-filled in the calculator.
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21 guides
- 27 Sept 2026AS/NZS 3008.1.1 table numbers: 2017 to 2025
Each AS/NZS 3008.1.1 table AmpSize reads, with its 2017 number, its 2025 number and whether its values moved, and one submain that cites both sets.Cable SizeAS/NZS 3008.1.1:2025 Table 3.19AS/NZS 3008.1.1:2025 Table 3.33AS/NZS 3008.1.1:2025 Tables 3.44, 3.45AS/NZS 3008.1.1:2017 Table 14AS/NZS 3008.1.1:2017 Table 22AS/NZS 3000:2018 Cl 3.4 - 27 Sept 2026AS/NZS 3008.1.1 vs 3008.1.2: AU and NZ conditions
The AU part of AS/NZS 3008.1 rates cable at 40 °C air and the NZ part at 30 °C. One 32 A circuit needs 6 mm² in Australia and 4 mm² in New Zealand.Cable SizeAS/NZS 3000:2018 Cl 3.3.2.1AS/NZS 3000:2018 Cl 3.4AS/NZS 3008.1.2:2017 Table 13AS/NZS 3008.1.1:2017 Table 13AS/NZS 3008.1.2:2017 Tables 27(1), 27(2)AS/NZS 3008.1.1:2017 Tables 27(1), 27(2) - 27 Sept 2026AS/NZS 3008.1.2 Tables 4 to 21: current ratings
What the current rating tables govern, which table AmpSize reads today, and a 40 A circuit that lands on 10 mm² with a derated capacity of 50 A.Cable SizeAS/NZS 3008.1.2:2017 Tables 4-21AS/NZS 3008.1.2:2017 Table 13AS/NZS 3000:2018 Cl 3.4AS/NZS 3000:2018 Cl 2.5.3.1 - 27 Sept 2026AS/NZS 3008 Table 13 (now 3.18): multicore ratings
What AS/NZS 3008 Table 13 gives, why the 2025 AU part calls it Table 3.18, how to read its columns into the calculator, and what moved for buried cable.Cable SizeAS/NZS 3008.1.1:2025 Table 3.18AS/NZS 3008.1.1:2017 Table 13AS/NZS 3008.1.2:2017 Table 13AS/NZS 3000:2018 Cl 3.4 - 27 Sept 2026AS/NZS 3008 Table 22 (now 3.33): bunched grouping
AS/NZS 3008 Table 22 is the grouping table for bunched circuits, not a temperature table. The 2025 AU part calls it Table 3.33. Read it in the calculator.Cable SizeAS/NZS 3008.1.1:2025 Table 3.33AS/NZS 3008.1.1:2025 Cl 3.5.2.8AS/NZS 3008.1.1:2017 Table 22AS/NZS 3008.1.2:2017 Table 22AS/NZS 3000:2018 Cl 3.4 - 27 Sept 2026AS/NZS 3008 Table 27 (now 3.44, 3.45): temperature
AS/NZS 3008 Table 27 corrects a cable rating for the air or soil temperature. The 2025 AU part splits it into Tables 3.44 and 3.45 and re-derives the factors.Cable SizeAS/NZS 3008.1.1:2025 Table 3.44, 3.45AS/NZS 3008.1.1:2025 Cl 3.5.3AS/NZS 3008.1.1:2017 Tables 27(1), 27(2)AS/NZS 3008.1.2:2017 Tables 27(1), 27(2)AS/NZS 3000:2018 Cl 3.3.2.1 - 27 Sept 2026AS/NZS 3008 vs BS 7671: cable sizing compared
How BS 7671 and AS/NZS 3000 with AS/NZS 3008.1 size a cable, where they differ, and why a BS current rating never converts into an AS/NZS one.Cable SizeAS/NZS 3000:2018 Cl 2.5.3.1AS/NZS 3000:2018 Cl 3.4AS/NZS 3000:2018 Cl 3.6.2AS/NZS 3008.1.2:2017 Tables 4-21AS/NZS 3008.1.2:2017 Cl 5.3BS 7671:2018 Appendix 4BS 7671:2018 Reg 433.1.1BS 7671:2018 Reg 543.1.3 - 27 Sept 2026AWG and the NEC for NZ and AU electricians
AWG sizes and the NEC set against AS/NZS 3000 and 3008.1. A gauge converts to mm², but its rating does not, and the NEC 3 % drop figure is only a note.Imperial CableAS/NZS 3000:2018 Cl 3.6.2AS/NZS 3000:2018 Table I1AS/NZS 3008.1.2:2017 Table 13NFPA 70-2017 Article 310NFPA 70-2017 210.19(A) Informational Note No. 4 - 27 Sept 2026DC cable size: 48 V battery and 600 V PV array
Two d.c. circuits sized to AS/NZS 3008.1.1:2025, a 48 V battery-to-inverter run that current sizes and a 600 V array feed that voltage drop sizes.DC Cable SizeAS/NZS 3008.1.1:2025 Table 3.21AS/NZS 3008.1.1:2025 Table 3.25AS/NZS 3008.1.1:2025 Table 4.16, 4.18, 4.21, 4.23AS/NZS 3008.1.1:2025 Cl 4.1.1AS/NZS 3008.1.1:2025 Cl 4.7AS/NZS 3000:2018 Cl 3.4 - 27 Sept 2026Motor full load current: 11 kW 400 V DOL
Full load current, shaft speed, torque and direct on line starting current for an 11 kW four-pole 400 V induction motor, with the figures the tool returns.MotorAS/NZS 3000:2018 Cl 2.5.3.1AS/NZS 3000:2018 Table C1 group LAS/NZS 3008.1.2:2017 Tables 4-21 - 26 Sept 2026Conduit fill: 4 x 6 mm² singles in 25 mm
Four 6 mm² single-core cables in 25 mm conduit, with the fill percent, the space factor and the smallest conduit the tool recommends for the bundle.Conduit FillAS/NZS 3000:2018 App C Para C6.2AS/NZS 3000:2018 Tables C10-C12 - 25 Sept 2026Commercial maximum demand with Table C2
A tender-stage demand assessment for a commercial building using AS/NZS 3000 Table C2, with each group demand and the per-phase figure the tool returns.Maximum DemandAS/NZS 3000:2018 Cl 2.2.2AS/NZS 3000:2018 Table C2AS/NZS 3000:2018 Table C4 - 24 Sept 2026Prospective fault current at a main switchboard
A 16 kA fault cleared in 0.1 s on 70 mm² copper XLPE, with the minimum conductor size, the withstand current and the k factor the adiabatic check returns.Fault RatingAS/NZS 3000:2018 Cl 2.5.4.1AS/NZS 3008.1.2:2017 Cl 5.3AS/NZS 3008.1.2:2017 Table 52 - 22 Sept 2026AS/NZS 3000 Table 8.1: max Zs by curve and rating
Table 8.1 max Zs for a 16 A device, by curve. B allows 3.59 Ω, C allows 1.92 Ω and D allows 1.15 Ω. See why, with a 30 m circuit at 0.89 Ω.Loop ImpedanceAS/NZS 3000:2018 Table 8.1AS/NZS 3000:2018 Table 8.2AS/NZS 3000:2018 Cl 5.7.2AS/NZS 3000:2018 Cl 5.7.4AS/NZS 3000:2018 Table 5.1AS/NZS 3008.1.2:2017 Tables 34-35 - 21 Sept 2026AS/NZS 3008.1.1:2025: what changed from 2017
The 2025 AU part adds d.c. ratings to 1500 V, renumbers every table and moves some ratings. Four circuits, each run on both editions, show what moves.Cable SizeAS/NZS 3008.1.1:2025 Table 3.18AS/NZS 3008.1.1:2025 Table 3.19AS/NZS 3008.1.1:2025 Tables 3.44, 3.45AS/NZS 3008.1.1:2025 Table 5.1AS/NZS 3008.1.1:2017 Table 13AS/NZS 3000:2018 Cl 3.4 - 21 Sept 2026Voltage rise for a 5 kW solar inverter cable
A 5 kW single-phase inverter 40 m from the switchboard on 10 mm² copper, with the rise in volts, the percent and the maximum length the tool returns.Voltage RiseAS/NZS 3000:2018 Cl 3.6.2 Note 3AS/NZS 3008.1.2:2017 Cl 4.5AS/NZS 3008.1.2:2017 Tables 30-35AS/NZS 4777.1:2016 Cl 3.3.3 - 19 Sept 2026AS/NZS 3000 Clause 3.6.2: voltage drop limit
What Clause 3.6.2 governs, how the 5 percent budget splits across mains and subcircuits, and a 25 A run over 35 m that returns 2.6 percent from the engine.Voltage DropAS/NZS 3000:2018 Cl 3.6.2AS/NZS 3000:2018 Cl 3.6.2 Note 3AS/NZS 3008.1.2:2017 Cl 4.5Electricity (Safety) Regulations 2010 reg 61 - 19 Sept 2026Cable size for a 32 A single-phase 25 m run
Work through a 32 A single-phase circuit over 25 metres in New Zealand. See every derating factor, the check that sets the size, and the result the tool gives.Cable SizeAS/NZS 3000:2018 Cl 3.4AS/NZS 3000:2018 Cl 2.5.3.1AS/NZS 3000:2018 Cl 3.6.2AS/NZS 3008.1.2:2017 Tables 4-21 - 19 Sept 2026Domestic maximum demand with Table C1
Assess the maximum demand of a New Zealand house from Table C1, group by group, with a worked example that lands on 52.61 A on a single-phase supply.Maximum DemandAS/NZS 3000:2018 Cl 2.2AS/NZS 3000:2018 Table C1 - 19 Sept 2026Earth fault loop impedance and maximum Zs
What earth fault loop impedance measures, how the maximum Zs check works, and a 32 A circuit on 6 mm² over 25 m that lands on 0.67 ohms against a 0.96 limit.Loop ImpedanceAS/NZS 3000:2018 Cl 5.7.4AS/NZS 3000:2018 Table 8.1AS/NZS 3000:2018 Table 5.1 - 19 Sept 2026Voltage drop with the mV/A·m method
How the millivolt per amp metre method works, with a 32 A run over 25 metres on 6 mm² copper and the exact drop, percent and maximum length the tool returns.Voltage DropAS/NZS 3008.1.2:2017 Cl 4.5AS/NZS 3000:2018 Cl 3.6.2AS/NZS 3008.1.2:2017 Tables 30-35