The 2025 and 2017 versions of the standard utilize specific tables for different scenarios: DC Cable Sizing using AS/NZS 3008; and Limitations - - GSES
| Variable | Impact | |----------|--------| | | Copper vs. aluminum (copper carries ~30% more current for same size) | | Insulation type | PVC (75°C), XLPE (90°C), thermosetting (110°C) – higher rating allows more current | | Installation method | Buried direct, in conduit, on tray, clipped to surface, in air, etc. | | Ambient temperature | Derating required above 30°C (air) or 25°C (ground) | | Grouping of cables | Multiple cables touching reduce heat dissipation | | AC or DC | AC may have skin/proximity effects in large conductors (>120mm²) |
The most critical "informative feature" of the current-carrying capacity tables (Tables 4 to 15) is that they are legally designated as , whereas the calculation methods used to derive them are Normative . as3008 current-carrying capacity table
Tables are often grouped by the conductor’s maximum operating temperature, such as V-75/V-90 (PVC) or X-90 (XLPE) .
| Code | Description | |------|-------------| | | Enclosed in conduit in a thermally insulating wall | | A2 | Enclosed in conduit on a wall or ceiling (not insulated) | | B1 | Enclosed in cable trunking (perforated) | | C | Clipped direct to a surface (open air) | | D | Buried direct in ground (thermal resistivity 1.2 K·m/W) | | E | On a cable ladder or tray – horizontal, spaced | | F | Free in air (not touching any surface) | | G | In free air but exposed to sun (requires additional solar derating) | The 2025 and 2017 versions of the standard
(officially AS/NZS 3008.1.1:2017 – Electrical installations – Selection of cables – Cables for alternating voltages up to and including 0.6/1 kV ) is the Australian and New Zealand Standard that provides methods for determining the current-carrying capacity of cables. It is the essential reference for sizing copper and aluminum conductors in low-voltage installations.
The AS3008 current-carrying capacity table is an essential resource for ensuring the safe and efficient design and installation of electrical systems in Australia. Electrical professionals must consult this table to guarantee compliance with the relevant standards and regulations. Tables are often grouped by the conductor’s maximum
Here is an explanation of that feature and how it works.