AS/NZS 3000 Explained: Australia and New Zealand's Wiring Rules
What is AS/NZS 3000?
AS/NZS 3000 is the joint Australian and New Zealand standard for electrical installations. Universally called the Wiring Rules, it governs every electrical installation from the point of supply (typically the main switch) through to the final socket outlet, fixed equipment, and connected luminaire. The current edition is AS/NZS 3000:2018, with three published amendments: Amendment 1 (2020), Amendment 2 (2020), and Amendment 3 (2025).
The standard is structured around earthing and bonding, residual current device (RCD) protection, maximum demand calculations, wiring methods, switchboard construction, and a series of special installations covering medical, hazardous areas, swimming pools, marinas, and hire shows. It is the single most-referenced document in any Australian or New Zealand electrical project.
All electrical installation work in Australia must be carried out by a licensed electrician under state and territory electrical safety legislation. The licence holder is responsible for the installation complying with AS/NZS 3000 and any current amendments, and for issuing a Certificate of Compliance Electrical Work (or jurisdictional equivalent) at completion. New Zealand applies the standard through its own electrical safety regulations and registered electrician scheme.
Where AS/NZS 3000 Fits in the Electrical Standards Stack
AS/NZS 3000 is the headline document, but a typical electrical project pulls in a small library of supporting standards. Use this map to find the correct reference.
| Standard | What it covers | When you need it |
|---|---|---|
| AS/NZS 3000 | Electrical installations (the Wiring Rules) | Every electrical installation |
| AS/NZS 3008.1.1 | Cable selection (current and voltage drop) | Cable sizing alongside AS 3000 |
| AS/NZS 3017 | Verification testing of electrical installations | Compliance testing |
| AS/NZS 3760 | In-service safety inspection (test and tag) | Existing equipment |
| AS/NZS 4836 | Safe working on LV installations | Construction and maintenance work |
| AS/NZS 60079 series | Hazardous area equipment | Petrochemical, industrial gas |
| AS 1768 | Lightning protection | Where lightning protection is specified |
| Supply authority service rules | Point-of-attachment requirements | Vary by network (Ausgrid, Endeavour, Essential, etc) |
AS/NZS 3000 is the headline standard. The supporting standards (AS 3008 for cables, AS 3017 for testing, AS 4836 for safety) are referenced from within it.
What AS/NZS 3000 Covers
Earthing and Bonding
The single most-tested area on inspection. AS/NZS 3000 Section 5 sets the rules for the Multiple Earthed Neutral (MEN) system used across Australia and New Zealand, the sizing of the main earthing conductor, and equipotential bonding of metallic services and structural steel. Earthing failures cause the most fatalities and trigger the most enforcement action of any electrical defect, which is why it is checked first on every inspection.
RCD Protection
Residual Current Devices interrupt earth fault currents before they reach a level that can harm a person. AS/NZS 3000 Section 2.6 sets when RCDs are required (most socket outlets, all final subcircuits in Class 2 and Class 9 buildings), what type (Type A or Type AC depending on the connected load), and how to coordinate with upstream protection so a fault on one circuit does not trip the entire board. See our RCD protection in commercial buildings memo for the full schedule.
Maximum Demand Calculation
Maximum demand is the basis for sizing the consumer mains, the main switchboard, and the supply authority connection. AS/NZS 3000 Appendix C provides Deemed-to-Satisfy demand factors per occupancy type. Engineering calculations using a specific load schedule are also permitted, and are usually more accurate for buildings with EV charging, large kitchens, or imaging equipment. Underestimating demand triggers nuisance trips and capacity upgrades. Overestimating wastes capital. See our AS 3000 maximum demand calculation and commercial max demand memos.
Cable Selection and Voltage Drop
AS/NZS 3000 Clause 3.4 references AS/NZS 3008.1.1 for cable current ratings and voltage drop calculations. The Wiring Rules require all cables to be sized so they do not exceed the manufacturer's current rating, account for installation derating (grouping, ambient temperature, depth, insulation), and limit voltage drop to 5% of nominal supply voltage from origin to the most distant socket outlet. See our cable sizing and voltage drop and AS 3008 commercial cable sizing memos.
Switchboard Construction and Access
Switchboards must be marked, accessible, and built with prescribed clearances. AS/NZS 3000 Section 2 covers main switchboard construction, distribution board construction, and the marking required: circuit identification, switching diagram, IP rating, and danger labelling. Door swings, head-room, and front-of-board working space are all specified to allow safe operation and maintenance. See our distribution board sizing and switchboard room requirements memos.
Which Edition Applies to Your Project?
The 2018 base text is the current version, but three amendments published since change several clauses. Use the table to confirm the right reference for your project.
| Edition | Status | When you'd use it |
|---|---|---|
| AS/NZS 3000:2007 | Withdrawn | Pre-2018 retrofit reference only |
| AS/NZS 3000:2018 (Amdt 1, 2) | Current | All current commercial projects |
| AS/NZS 3000:2018 (Amdt 3, 2025) | Latest amendment | 2025 onwards new installations |
Confirm the amendment status with the licensed electrician at handover. The amendments are not retroactive on existing installations but apply to new work and modifications.
Most-Asked Questions
- What is AS/NZS 3000? Australia and New Zealand's electrical installation standard, universally called the Wiring Rules.
- Is AS/NZS 3000 mandatory? Yes. State and territory electrical safety legislation requires all installations to comply with AS/NZS 3000.
- Do I need a licensed electrician? Yes. All electrical installation work must be performed by a licensed electrician under state and territory legislation.
- What is the difference between AS/NZS 3000 and AS/NZS 3008? AS 3000 is the installation standard. AS 3008 is the cable selection standard. AS 3000 calls AS 3008 up for cable sizing.
- What edition is current? AS/NZS 3000:2018, with Amendments 1 and 2 (both 2020) and Amendment 3 (2025).
- When are RCDs required? Most socket outlets need RCD protection. Class 2 and Class 9 buildings need all final subcircuits on RCDs. AS/NZS 3000 Section 2.6 has the full schedule.
- What is maximum demand and how is it calculated? Maximum demand is the highest load the installation needs to supply. AS/NZS 3000 Appendix C provides demand factors per occupancy. Engineering calculations using actual load schedules are also permitted.
Three Compliance Traps We See Most
- Wrong amendment cited. Documentation drafted to AS/NZS 3000:2018 base text without acknowledging Amendments 1, 2, or 3. The amendments tighten several clauses, including RCD requirements and main switch specifications. Always cite the current amendment status on the cover sheet.
- Maximum demand under-calculated. Engineer uses Appendix C demand factors that do not reflect the actual load profile (high-density office with EV charging, medical with imaging equipment, commercial kitchen with electric cooking). Switchboard, mains cable, and supply authority connection all undersized. Use a specific load schedule when standard occupancy factors do not fit.
- Cable voltage drop ignored on long runs. AS/NZS 3000 limits voltage drop to 5% from origin to the final socket outlet. Long runs in industrial buildings or large warehouses fail this without upsizing the cable. The calculation per AS/NZS 3008.1.1 is required, not optional.
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References
- AS/NZS 3000:2018, Electrical installations (known as the Wiring Rules), Standards Australia and Standards New Zealand. Including Amendments 1 (2020), 2 (2020), and 3 (2025).
- AS/NZS 3008.1.1:2017, Electrical installations, Selection of cables, Part 1.1: Cables for alternating voltages up to and including 0.6/1 kV, Standards Australia and Standards New Zealand.
- AS/NZS 3017:2022, Electrical installations, Verification guidelines, Standards Australia and Standards New Zealand.
- AS/NZS 4836:2023, Safe working on or near low-voltage and extra-low-voltage electrical installations and equipment, Standards Australia and Standards New Zealand.
- National Construction Code 2025, Volume Two, ABCB (where AS 3000 is referenced for residential).