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Ammendments to AS/3500.2:2015

Changes have effected the general requirements for sanitary plumbing.
On 30 June 2017, amendments to AS/NZS 3500.2 were published. These were approved by NZ Standards Board on 10 May 2017.

The specific clauses affected are 4.9.1, 4.9.2,4.9.3, 5.3, 6.5.2.3, 6.5.2.4, 6.5.2.5, 6.5.2.6,figures 4.9.2, 4.10 and 6.5.2.1.

Many of the changes have affected the general design requirements for sanitary plumbing.

Specifically, there has been a move away from the use of sweep junctions (e.g. swept 88° junctions) to connect in combined discharge pipes.

Two areas that will have a noticeable effect on plumbers are with junctions in graded pipes and junctions installed in a vertical plane.

With regards to junctions in graded pipes pre-amendment 6.5.2.3 outlined that “Junctions (whether equal or unequal) shall be either 45° or sweep type” however, post-amendment 6.5.2.3 states “Junctions
(whether equal or unequal) shall be 45°. “

With regards to junctions installed in a vertical plane pre-amendment 6.5.2.6 outlined that “Sweep and 45° junctions may be installed in the vertical plane for the connection of a single discharge pipe….”

However, post-amendment 6.5.2.6 states “45° junctions shall be installed in the vertical plane for the connection of a single discharge pipe and common discharge pipe.”

A noticeable change in drainage systems is in figure 4.10 which shows a typical vertical jump-up from the main drain to graded branches.

Pre-amendment this figure displays a sweep 88° junction and post-amendment it displays a 45° junction.

The move to 45° junctions and away from sweep junctions will be an improvement to the system as it improves airflow in the discharge pipes resulting in a lower chance of blockage.

The updated version of 3500.2:2015 can be accessed by authorised plumbers, gasfitters and drainlayers through the trade login at www.pgdb.co.nz by clicking on the Standards New Zealand logo.

Contact the Plumbers, Gasfitters and Drainlayers Board

Phone: 0800 743 262, Email: registrar@pgdb.co.nz, Post: PO Box 10655, The Terrace, Wellington 6143
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