UNDERSTANDING AS/NZS 61439:2016
TECHNICAL
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.
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June 2022
