NCC 2022 Volume Three - Plumbing Code of Australia
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B6
Part B6 Rainwater servicesPart B6 Rainwater services
A rainwater service must comply with Section 15 of AS/NZS 3500.1. Additionally, after Clause 15.3.3(c) insert (d)—
(d) For Class 1 buildings and extensions or additions to Class 1 buildings the following applies.
Where a water service from a rainwater tank interconnect with a water service from a water main supply, the supply to a fixture, appliance or water outlet shall be maintained by a device/mechanism that facilitates a seamless automatic switching from one water service supply to another and vice versa without the need for manual intervention.