AS/NZS 3008.1.1:2025 — New Zealand Transition Guide

AS/NZS 3008.1.1:2025 is a joint Australian and New Zealand standard. When a new edition is published, both countries enter a transition period during which the previous edition remains valid. For New Zealand electrical engineers, understanding the transition timeline is critical for current projects and upcoming tenders.

This guide covers the NZ-specific implications of the 2025 edition, including the transition timeline, regulatory bodies involved, and practical steps to prepare.

Several NZ organisations are involved in the adoption and enforcement of electrical standards:

• Standards New Zealand (SNZ): Publishes and administers NZ standards, including the joint AS/NZS series. SNZ determines the transition period and withdrawal date for superseded editions. Website: standards.govt.nz
• Electrical Workers Registration Board (EWRB): Registers and licenses electrical workers in New Zealand. EWRB sets competency requirements and may update examination content to reflect the 2025 edition. Website: ewrb.govt.nz
• WorkSafe New Zealand: The workplace health and safety regulator. WorkSafe enforces compliance with the Electricity (Safety) Regulations 2010, which reference AS/NZS standards. Website: worksafe.govt.nz
• Energy Safety (within WorkSafe): The specific unit within WorkSafe responsible for electrical safety regulation, including approval of electrical installations and investigation of electrical incidents.

The 2025 edition changes affect NZ engineers in the same way as Australian engineers, but with some NZ-specific considerations:

DC Cable Sizing — Solar and Battery

New Zealand’s solar PV market is growing rapidly, particularly commercial rooftop and community-scale solar. The new DC cable provisions (up to 1500 V) in the 2025 edition are directly relevant. Previously, NZ engineers used AC tables with corrections or referenced IEC 60364-7-712 for DC sizing — the 2025 edition provides a local standard basis.

Revised Grouping Factors

The tighter grouping derating factors in Table 25 (for cables on unperforated trays) affect commercial and industrial installations. NZ switchboard rooms and cable ladder runs with dense cable groupings should be checked against the new factors. See the 2025 vs 2017 changes guide for the specific factor changes.

Soil Thermal Resistivity

While the most dramatic soil resistivity changes affect Australian arid zones, NZ engineers working on buried cable installations should note the updated Table 27 values. NZ soils vary significantly — from wet clay in lowland areas to pumice soils in the volcanic zones of the central North Island. The 2025 edition’s expanded soil resistivity range (including the new 3.0 K·m/W row) provides better coverage for NZ conditions.

EWRB Examination Updates

EWRB periodically updates the registration examination to reflect current standards. Electricians and electrical engineers preparing for EWRB examinations should study the 2025 edition, particularly the new DC provisions and revised derating tables. Check the EWRB website for the current examination syllabus.

Here is a practical checklist for NZ electrical engineers and contractors preparing for the transition:

1. Purchase the 2025 edition: Available from Standards New Zealand or Standards Australia. The NZS and AS versions are identical (it is a joint standard).
2. Review the key changes: Read our AS/NZS 3008.1.1:2025 vs 2017 comparison guide for a detailed breakdown of what changed and why.
3. Check your cable sizing software: Ensure your calculation tools support the 2025 edition tables. ECalPro supports both editions with a side-by-side comparison mode.
4. Audit current projects: For projects currently in design that will be constructed after the 2017 withdrawal date, consider re-running cable calculations to the 2025 edition now. Key areas to check:
   • Grouping factors for cables on unperforated trays (Table 25)
   • Buried cables in dry or volcanic soil (Table 27)
   • Any DC circuits (solar PV, battery storage)
5. Update specification templates: Change standard references in your design basis documents, project specifications, and tender templates from “AS/NZS 3008.1.1:2017” to “AS/NZS 3008.1.1:2025” for new projects.
6. Inform your team: Share the key changes with your engineering team and electricians. The revised grouping factors and new DC provisions are the areas most likely to affect day-to-day work.

Existing installations designed and built to AS/NZS 3008.1.1:2017 remain compliant. There is no requirement to retrospectively upgrade existing installations to the 2025 edition. The transition applies to:

• New installations: Must use the current edition at the time of design/construction. After the 2017 withdrawal, only the 2025 edition is acceptable.
• Significant modifications: If you are making substantial modifications to an existing installation (e.g., adding a new distribution board, major cable run additions), the new work should be designed to the current edition.
• Maintenance and like-for-like replacements: Replacing a cable with the same size and type as originally installed does not trigger a requirement to re-calculate to the 2025 edition. However, if the replacement involves a change in installation method or cable type, verification against the current edition is good practice.

ECalPro provides a free online cable sizing calculator that supports both the 2017 and 2025 editions of AS/NZS 3008.1.1:

• Select either edition in the standard dropdown
• Compare results side-by-side with the “Compare editions” toggle
• Full derating factor chain including the revised 2025 values
• DC cable sizing mode for solar PV and battery installations
• PDF, XLSX, and DOCX report export with full standard clause references

→ Open the Cable Sizing Calculator

Free to use — no signup required. Updated for AS/NZS 3008.1.1:2025.

This guide is based on publicly available information about AS/NZS 3008.1.1:2025 and the standard NZ transition process. For authoritative guidance on transition dates and regulatory requirements, consult Standards New Zealand, EWRB, and WorkSafe NZ. ECalPro recommends purchasing the official standard for design work.