Part C1 Sanitary plumbing systems
Introduction to this Part
This Part sets out the requirements for the design, construction, installation, replacement, repair, alteration and maintenance of any part of a sanitary plumbing system of a property including from sanitary fixtures and appliances to an approved disposal system.
The Objective of this Part is to—
- safeguard people from illness, injury or loss (including loss of amenity) due to the failure of a sanitary plumbing installation; and
- ensure that a sanitary installation is suitable; and
- conserve water and energy; and
- safeguard the environment; and
- safeguard public and private infrastructure; and
- ensure that a sanitary installation is designed and is capable of being maintained so that throughout its serviceable life it will continue to satisfy Objectives (a) to (e).
Sanitary fixtures and sanitary appliances must be provided with an adequate disposal system that does not impact adversely on occupants of the premises, property, the environment or the Network Utility Operator's infrastructure.
CP1.1 Design, construction and installation
A sanitary plumbing system must ensure the following:
Access for maintenance of mechanical components, operational controls and for clearing blockages.
Ventilation, to avoid hydraulic load imbalance is provided.
Effective and efficient water use.
A sanitary plumbing system must avoid the following:
Entry of water, sewage, sullage, foul air and gases from the system into buildings.
Damage from superimposed loads, ground movement or root penetration.
Entry of surface water, subsurface water and stormwater into the system.
Explanatory information: Non-flushing (waterless) urinals
Where a non-flushing (waterless) urinal is to be installed to a sanitary plumbing system comprising copper, copper alloy or other metallic piping, undiluted discharge transported through such pipework may increase the likelihood of corrosion.
Practitioners should also be aware that undiluted discharge, transported through pipework of any material, can cause a build-up of struvite (ammonium magnesium phosphate) inside the pipework, potentially causing blockage within the sanitary plumbing system.
There are no Verification Methods in this Part.
C1.2 Invert levels
The invert level of a trap or gully weir must be a minimum of 10 mm higher than the soffit of the pipe to which it connects.
C1.3 General requirements
The design, construction, installation, replacement, repair, alteration and maintenance of a sanitary plumbing system must be in accordance with AS/NZS 3500.2.
Explanatory information: Cross-volume considerations
NCC Volume One Class 2 to 9 buildings
NCC Volume Two Class 1 and 10 buildings
Termite management for attachments to buildings and penetrations through a slab
Penetrations for pipework through a vapour barrier
Pipework in timber bearers and joists of solid timber or engineered wood products
Fittings, fixtures and pipework installations in steel framed construction
Penetrations through a fire-resisting wall or floorC3 Protection of openings
Fixtures or fittings in a wet areaF1 Damp and weather proofing
Service pipework external to the building and penetrations through roof cladding in a bushfire prone area
Pipework sound insulation