understanding AS/nZS 61439:2016

LOW VOLTAGE SWITCHGEAR AND CONTROLGEAR

CuRRenT SWITCHBOARD ReQuIReMenTS AS PeR THe WIRInG RuLeS STATe THAT A SWITCHBOARD SHALL COMPLY WITH THe AS/nZS 3439 SeRIeS OR AS/nZS 61439 SeRIeS IF IT IS >125 AMPS PeR PHASe OR HAS >10 KA ROOT MeAn SQuARe (RMS). AS/nZS 3000:2018 AMenDMenT 3, WHICH IS CuRRenTLY In DRAFT PHASe, WILL LIKeLY See THe ReMOVAL OF THe AS/nZS 3439 SeRIeS FROM THIS MAnDATe, MeAnInG THAT OnCe enACTeD, SWITCHBOARDS WILL neeD TO MeeT THe ReQuIReMenTS OF AS/nZS 61439 OnLY.

AS/nZS 61439 is a more thorough and detailed standard, clarifying the specific requirements for testing and verification. The objective of the AS/nZS 61439 series is to harmonise, as far as practicable, all rules and requirements of a general nature applicable to low voltage switchgear and controlgear assemblies. The new standard aims to clarify legal and financial responsibilities in specifications, testing, design and construction between the user and the assembly manufacturer.

Panel boards adhering to AS/nZS 61439.2 should be marked in a durable manner, be visible and legible when installed and in operation. Required markings include the manufacturer’s name, identification number, date of manufacturer and standard that the board is built to (AS/nZS 61439 part 2 or 3). In addition to the above, panel boards adhering to AS/nZS 61439.3 must also display the rated current of distribution boards intended to be operated by ordinary persons (DBO) InA and ingress protection (IP) rating if > IP 2XC. Compliant switchboards should also be accompanied by a Supplier Declaration of Conformity (SDOC) and a technical data sheet with additional characteristics. In the absence of this information, questions should be asked as to whether the switchboard is built to AS/nZS 61439, as you may be liable for any issues that arise.

Should you make alterations to a switchboard outside of the original design specification, you will become liable for the design of the switchboard and take on all associated responsibilities. Common in-scope accessories include emergency lighting test kits, external lighting control, rain hoods, gland plates, surge kits, concept isolators, door handles, vents, drains and floor mounting plinths where these items have been approved by the original switchboard manufacturer.

Assemblies are tested with one type of switchgear, so fitting alternative brands will generally go outside of scope. Replacing like-for-like electrical components is allowable, but always follow the manufacturer’s advice and supporting documentation. If repairing an old switchboard, be careful to stay within the definition of a repair, rather than an alteration. You may find that an upgrade is required in order to meet the new standard and to ensure that you don’t become liable for changes in switchboard design.

Scan the QR code or visit www.bit.ly/necatv30002018 to watch the free AS/nZS 61439 webinar presented by nHP Product Manager, Jamie Goddard on neCA TV.

THE IMPORTANCE OF ELECTRICAL STANDARDS

electrical standards for equipment, cable connections, devices, and installations stipulate the importance of selecting and installing equipment correctly, ensuring it is consistently performing safely, reliably, and as intended. Additionally, accurately following electrical standards ensures proper interfacing between equipment and systems.

Ensuring product quality

electrical components, and the installation of those components, need to deliver the functionalities that they are designed for. They need to deliver that functionality, under varying operating conditions, without creating any unnecessary hazards to the operator or environment for their entire design life.

Standards define the parameters for functionality, safety and maintainability. They also provide the fundamental test criteria that the device must withstand to prove a design, known as a type test.

Type tests are conducted on selected samples to ensure the integrity and validation of the design. STAnDARDS SeT OuT SPeCIFICATIOnS, PROCeDuReS AnD GuIDeLIneS, WITH THe AIM OF enSuRInG PRODuCTS, SeRVICeS, AnD SYSTeMS ARe SAFe, COnSISTenT, AnD ReLIABLe.*

Harmonisation with international standards

International standards aim to represent a global consensus on technical approaches and regulations.

In most instances, and where practical, Australian Standards are aligned with internationally recognised standards. For example, lugs and links are regulated under AS/nZS 4325.1 Compression and mechanical connectors for power cables with copper or aluminium conductors, and share a relevance to previous international standard IeC 1238-1, which was produced by the International electrotechnical Commission (IeC). This example is one of many cases where harmonisation between Australian and International Standards has been aligned.

Manufacturers’ compliance

Having a dependable manufacturer who understands and adheres to Australian standards, provides in-country computer numerical control (CnC) manufacturing, national Association of Testing Authorities (nATA) accredited calibration, maintenance and repair services is key to ensuring a product’s service life is satisfied. This allows a rapid response to live test results, immediate alterations, consultation with experts on the best strategy for your business, and ensures the end results comply with all relevant legislation.

It is a good idea to ask your manufacturer or supplier for a Supplier Declaration of Conformity (SDOC) and technical data sheets to ensure that the equipment and materials you are purchasing meet the relevant Australian standards and are suitable for use in Australia.

In our ever-evolving world, using products that meet Australian standards ensures their quality and consistency, ultimately giving businesses a competitive edge and consumers greater peace of mind.

Daniel Tragai

Senior Category Manager, Legend www.cabac.com.au

*Standards Australia