Compliance Explanation for Low-Voltage Switchgear Assemblies：Comply with AS/NZS 61439 Series Standards

Overview of AS/NZS 61439
AS/NZS 61439 is the Australian and New Zealand standard for Low-voltage Switchgear and Controlgear Assemblies, published in May 2016. This standard is adapted and revised based on IEC 61439, and fully replaces the old standard AS/NZS 3439 issued in 2002. A 5-year transition period was allowed for the standard migration.
The key change between the two standards: the classification of Type-Tested Assemblies (TTA) and Partially Type-Tested Assemblies (PTTA) has been phased out, and replaced by the Design Verification system.

Role Definition & Compliance Responsibility
DSJ Electrical acts as both the Original Manufacturer and Assembly Manufacturer for all our low-voltage switchgear products. We complete the full process including original design, enclosure manufacturing, component assembly and final inspection.
£ Original Manufacturer: Responsible for product original design and all required Design Verifications in accordance with AS/NZS 61439.
£  Assembly Manufacturer: Responsible for product assembly, on-site workmanship control and full set of Routine Verifications for every finished unit.
£ User: The party who specifies technical requirements, purchases, installs, operates and maintains the switchgear assemblies.
DSJ Electrical takes full and sole responsibility for the design, production, assembly, testing and overall compliance of all switchgear assemblies we supply.

Verification Requirements under AS/NZS 61439
All switchgear assemblies supplied by DSJ must be fully verified to meet the requirements of AS/NZS 61439. The verification work is divided into two categories:
Design Verification
Design Verification is used to confirm that the product design complies with the requirements of AS/NZS 61439 series standards. It is completed during product development and finalization by our technical team.
Three acceptable Design Verification methods specified by the standard:
R  Verification by Testing: Conduct mechanical and electrical tests as required.
R Verification by Comparison with a tested reference design: Prove the new design has equivalent or better performance than the validated reference design.
R  Verification by Assessment: Carry out evaluation via professional calculation and design rules with sufficient safety margins.
All design verification items are listed in Table D.1, Annex D of AS/NZS 61439.1.
Routine Verification
Routine Verification is performed on every finished assembly prior to factory dispatch. The purpose is to detect defects in raw materials and workmanship, and confirm the correct function of finished products. Routine verification can be carried out during or after assembly.

 Applicable Parts of AS/NZS 61439
The AS/NZS 61439 series consists of 8 parts:
1）AS/NZS 61439.0: Guide to specifying assemblies
2）AS/NZS 61439.1: General Rules
3）AS/NZS 61439.2: Power switchgear and controlgear assemblies
4）AS/NZS 61439.3: Distribution boards intended to be operated by ordinary persons (DBO)
5）AS/NZS 61439.4: Particular requirements for assemblies for construction sites (ACS)
6）AS/NZS 61439.5: Assemblies for power distribution in public networks
7）AS/NZS 61439.6: Busbar trunking systems (busways)
8) AS/NZS 61439.7: Assemblies for specific applications (marinas, camping sites, market squares, EV charging stations etc.)
AS/NZS 61439.1 (General Rules) applies to all types of low-voltage switchgear and controlgear assemblies. According to the application scenario and technical parameters, our low-voltage switchboards comply with either AS/NZS 61439.2 or AS/NZS 61439.3, which is determined at the design stage.
Difference between AS/NZS 61439.2 and AS/NZS 61439.3
AS/NZS 61439.2: Applies to power switchgear and controlgear assemblies for industrial, commercial and similar applications. These products are intended for operation by qualified personnel only. All switchboards not meeting the criteria of DBO shall be manufactured in accordance with this part.
AS/NZS 61439.3: Applies to Distribution Boards intended to be operated by Ordinary Persons (DBO). A distribution board is classified as DBO when its rated current ≤ 250A and the rated current of any outgoing circuit ≤ 125A.

Annex C – User Information Template
Annex C of AS/NZS 61439.1 provides template forms to collect technical requirements from the user, which also serves as the agreement between DSJ and the customer. Corresponding documents shall be adopted according to the applicable part of AS/NZS 61439.

Annex D – List of Design & Routine Verification Items
The table below summarizes all mandatory verification items in accordance with Table D.1 (Annex D, AS/NZS 61439.1). All verification work below is completed by DSJ Electrical.