AS/NZS 3500.2:2003


Plumbing and drainage, Part 2: Sanitary plumbing and drainage

Included in NCC Primary References Historical Editions, Supplements and Amendments Set
This Standard specifies the requirements for the design and installation of sanitary plumbing and drainage from the fixtures to a sewer, common effluent system or an on-site wastewater management system, as appropriate.
Published: 15/12/2003
Pages: 184
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope and application
1.1.1 Scope
1.1.2 Application Plumbing Code of Australia reference New Zealand Building Code reference
1.2 Normative references
1.3 Definitions
1.4 Plastics abbreviations
1.5 Measurement of pipe length
1.6 Pipe grades
1.7 Equivalent pipe sizes
2 Materials and products
2.1 Scope of Section
2.2 Authorization
2.3 Selection and use of materials and products
2.4 Limitations on the use of pipes and fittings
2.4.1 General limitations
2.4.2 Metallic pipes and fittings
2.4.3 Fabricated metallic pipes and fittings
2.4.4  Plastics pipes and fittings
2.4.5 Other materials—Pipes and fittings
2.4.6 Pipes and fittings for pressure applications
2.5 Sheet materials
2.5.1 Copper
2.5.2 Stainless steel
2.6 Joints
2.6.1 Flanged joints
2.6.2 Elastomeric seals
2.6.3 Silver brazing alloy Copper and copper alloys Stainless steels
2.6.4 Filler rods for stainless steel joints
2.6.5 Plastics Solvent cement and priming fluid High density polyethylene (PE-HD)
2.7 Concrete and mortar
2.7.1 Concrete mix
2.7.2 Cement mortar
2.7.3 Chemical admixtures
2.7.4 Water for concrete and mortar
2.7.5 Steel reinforcement
2.8 Miscellaneous
2.8.1 Timber
2.8.2 Epoxy resins
2.8.3 Pipe bedding
2.8.4 Backfill
2.8.5 External protective coatings
2.8.6 Fibreglass reinforced plastics tanks
2.8.7 Geotextiles
3 Drainage design
3.1 Scope of Section
3.2 Location of drains
3.3 Size and length of drains
3.3.1 Fixture unit loading
3.3.2 Main drain
3.3.3 Branch drains
3.3.4 Limitations on vented DN 80 branch drains
3.3.5 Use of eccentric taper fitting
3.3.6 Size change
3.3.7 Downstream of boundary trap
3.3.8 Oversizing of drains
3.3.9 Maximum length of fixture discharge pipes
3.4 Grades of drains
3.4.1 Minimum grade
3.4.2 Reduced grades
3.4.3 Steep grades
3.4.4 Anchor blocks
3.5 Laying of drains
3.5.1 General
3.5.2 Easements and watercourses
3.6 Proximity to other services
3.6.1 General
3.6.2 Separation from above ground electrical conduit, wire, cable, consumer gas or water pipes
3.6.3 Separation from underground electrical supply cables or consumer gas pipes
3.6.4 Separation from underground electrical earthing electrode
3.6.5 Separation from underground communication cable
3.6.6 Separation from other underground services
3.6.7 Crossover of underground services
3.6.8 Clearance from underground obstructions
3.7 Depth of cover
3.7.1 General
3.7.2 Depth of cover in public areas and private areas
3.7.3  Drains installed with less than minimum cover
3.7.4 Drains under buildings
3.8 Building over drains
3.8.1 Alterations and additions to buildings
3.8.2 Installation near and under buildings
3.8.3 Fixture connections to vitrified clay drains under buildings
3.9 Venting of drains
3.9.1 General
3.9.2 Location Upstream vent Downstream vent Low level vent (ground vent)
3.9.3 Size of drainage vents  Minimum size Rating of vents Connection of vent to drain Water closet pans in toilet blocks
3.10 Unvented branch drains
3.10.1 General
3.10.2 Sizing
3.10.3 Maximum length
3.10.4 Vertical sections
3.10.5 Connection of fixture discharge pipes
3.11 Unvented drains discharging to gullies
3.11.1 General
3.11.2 Length of unvented section
3.12 Inlet pipe to disconnector gully
3.13 Restriction on connections in proximity to a stack
3.14 Connection of basement fixtures
3.15 Connections in flood-prone areas
3.15.1 Inlet above flood level
3.15.2 Inlet below flood level
3.16 Re-use of existing sanitary drains
3.17 Drains in caravan parks
3.17.1 General
3.17.2 Soil waste dump points
3.17.3 Connection points for short-term sites
3.17.4 Relocatable dwellings located on long-term sites
3.18 Vacuum systems
3.19 Common effluent drainage system
3.19.1 General
3.19.2 Drainage connections
3.19.3 Septic tanks
3.19.4 Sullage tanks
3.20 On-site wastewater treatment units
4 Drainage system
4.1 Scope of Section
4.2 Point of connection
4.2.1 General
4.2.2 Protection of sewers
4.2.3 Tidal or water-charged locations
4.3 Drains
4.3.1 Below ground
4.3.2 Above ground under buildings
4.3.3 Changes of direction
4.3.4 Maximum length of fixture discharge pipes
4.4 Inspection shafts and boundary traps
4.4.1 General
4.4.2 Inspection shafts and boundary trap risers Installation Location Alternative locations
4.4.3 Installation of inspection shafts General Size
4.4.4 Installation of boundary traps Outside buildings Inside buildings Size
4.5 Reflux valves
4.5.1 Location
4.5.2 Installation
4.5.3 Surcharging sewer
4.5.4 Reflux valve chambers
4.6 Gullies
4.6.1 General
4.6.2 Installation
4.6.3 Maintenance of water seal
4.6.4 Prohibited discharge
4.6.5 Disconnector gullies inside buildings
4.6.6 Overflow relief gullies General Permitted omission Size Location Alternative locations Height of overflow point below lowest fixture Height above surrounding ground Height in flood-affected areas
4.6.7 Floor waste gullies General Permitted discharges Connection of fixtures Wastepipes discharging to floor waste gullies (FWGs) Prohibited location Removable grate Height of gully riser Discharges from tundishes Size of gully trap outlet Connection of wastepipes Size of wastepipes from fixtures
4.6.8  Charging floor waste gullies General Installation
4.7 Inspection openings (IO)
4.7.1 Location
4.7.2 Size
4.7.3 Types
4.7.4 Access to inspection openings
4.7.5 Sealing
4.8 Inspection chambers
4.8.1 General
4.8.2 Size
4.8.3 Prefabricated chambers
4.8.4 Construction Conduits and channels Jump-ups Ladders Cement rendering Top section Access opening Construction joints Inserts
4.8.5 Differential settlement
4.9 Junctions in drains
4.9.1 Drains installed at grade
4.9.2 Junctions installed other than on grade
4.9.3 Junctions installed in vertical plane
4.9.4  Square junctions
4.9.5  Junctions for stacks connected to below-ground drainage
4.10 Jump-ups
4.11 Disconnection and sealing
4.11.1 Disconnection from the sewer
4.11.2 Sealing
5 Excavation bedding support and backfilling
5.1 Scope of Section
5.2 Excavation of trenches
5.2.1 Safety
5.2.2 Trench dimensions
5.2.3 Over-excavation
5.2.4 Adjacent to the sewer
5.2.5 Water-charged ground
5.2.6 Shoring and underpinning buildings
5.3 Concrete support for drains
5.4 Bedding of drains
5.4.1 General
5.4.2 Bedding materials
5.4.3 Pipe side support and overlay materials
5.4.4 Bedding and backfill
5.4.5 Minimum cover
5.5 Installation of backfill materials
5.5.1 General
5.5.2  Builder’s waste
5.5.3 Excavated material
5.6 Drains in other than stable ground
6 General design requirements for sanitary plumbing systems
6.1 Scope of Section
6.2 Fixture unit ratings
6.3 Venting for fixtures
6.4 Trapping of fixtures and appliances
6.4.1 General
6.4.2 Water seal
6.4.3 Location of traps and self-sealing devices
6.4.4 Multiple outlets General Distance between outlets
6.5 Graded discharge pipes
6.5.1 Minimum grades
6.5.2 Connection methods General Opposed discharges Junction types in graded pipes Junctions installed at grade Junctions installed other than at grade Junctions installed in a vertical plane Junctions for stacks connected to a graded pipe
6.6 Junctions in stacks
6.6.1 Types
6.6.2 Restrictions for square and ball junctions
6.6.3 ‘Text deleted’
6.6.4 ‘Text deleted’
6.6.5 Opposed connections At the same level At different levels
6.7 Connections near base of stacks
6.7.1 Connections to drains or graded pipes
6.7.2 Connections above base of stack (see Figure 6.4)
6.7.3 Connection of stacks to graded pipes or drains above ground
6.7.4  Bends at the base of stacks
6.8 Vents
6.8.1 Prohibited use
6.8.2 Minimum grade
6.8.3 Interconnections
6.8.4 Termination
6.8.5 Connection to graded pipes
6.9 Air admittance valves
6.9.1 Air admittance valves
6.9.2 Requirements for use
6.9.3 Location
6.9.4 Installation
6.10 Pressure attenuators
6.10.1 General
6.10.2 Installation of pressure attenuators
6.10.3 Location
6A Greywater plumbing and drainage systems
6A.1 Scope of Section
6A.2 General
6A.3 Material and products
6A.4 Installation requirements
6A.4.1 Installation
7 Fully vented systems and fully vented modified systems—Design and installation
7.1 Scope of Section
7.2 System types
7.2.1 General
7.2.2 Fully vented system
7.2.3 Fully vented modified system
7.3 Size of discharge pipes
7.3.1 General
7.3.2 Fixture unit loading
7.3.3 Minimum size
7.3.4 Limitation on DN 80 pipes
7.3.5 Oversizing
7.4 Size of stacks
7.5 Venting
7.5.1 Trap vents Connection for fixtures Topmost fixture connected to the stack Size Installation Common vent for fixtures
7.5.2 Branch vents Size Arrangement Size changes
7.5.3 Relief vents General At offsets in stacks Connection Upper termination Size
7.5.4 Stack vents Extension Developed length
7.5.5 Cross-relief vents
7.5.6 Header vents General Sizing
7.5.7 Group and common vents General Arrangement Sizing Termination Group-vented branches (see Figure 7.10) Size Arrangement Connection of common discharge pipe Connection of basins and bidets Connection of all other fixtures
7.6 Offsets in stacks
7.6.1 Steep offsets General Sizing of stack Venting
7.6.2 Graded offsets General Minimum grade Restricted connection zones above the graded offset (see Figure 7.12) Restricted connection zone below the graded offset Restricted connection zone within the graded offset (see Figure 7.13) Sizing of stack Venting
8 Single stack systems and single stack modified systems—Design and installation
8.1 Scope of Section
8.2 System design
8.2.1 General
8.2.2 Single stack systems (see Figure 8.1)
8.2.3 Single stack modified system (see Figure 8.2)
8.2.4 Design requirements
8.2.5 Number of floor levels (see Figure 8.3)
8.3 Rating of fixtures
8.4 Fixtures permitted to be connected
8.4.1 Domestic or residential buildings
8.4.2 Commercial or industrial buildings
8.5 Connection of fixtures without trap vents
8.5.1 Separate fixture discharge pipes
8.5.2 Permitted variations
8.5.3 Opposed junctions
8.5.4 Bends in fixture discharge pipes
8.5.5 Vertical dropper on fixture discharge pipes
8.5.6 Connection from waste fixtures to stack
8.5.7 Connection from waste fixtures to stack below restricted zone
8.5.8 Floor waste gullies
8.5.9 Traps
8.5.10 Connection of ranges of fixtures
8.5.11 Ranges of basins General Fixture discharge pipe Common discharge pipe Spacing of traps
8.5.12 Ranges of water closet pans General Fixture discharge pipe Common discharge pipes Spacing of traps
8.5.13 Ranges of wall-hung urinals General Fixture discharge pipe Common discharge pipe Spacing of traps
8.6 Venting of stacks
8.6.1 General
8.6.2 Cross-vents (single stack modified system) General Installation
8.6.3 Relief vents (single stack modified system)
8.7 Sizing of stacks
8.7.1 Single stack systems
8.7.2 Single stack modified systems
8.8 Variations to single stack systems
8.8.1 General
8.8.2 DN 80 stack
8.8.3 DN 80 stack with the top section graded and installed in a domestic or residential building
8.8.4 DN 100 stack up to three floors with the top section graded and installed in a domestic or residential building receiving 30 fixture units
8.8.5 DN 100 stack of one floor with top section graded
8.8.6 Connection for multiple fixtures into or below a graded offset (DN 100 stacks) (see Figure 8.11)
8.8.7 Waste stack up to DN 100 with either graded or steep offset between the highest and lowest connections Graded offsets Steep offsets
8.8.8 DN 65 waste stack
8.8.9 DN 50 vertical section of stack
8.8.10 Connection at the change of direction in stack with top section graded
8.9 Offsets in single stack systems only
8.9.1 General
8.9.2 Steep offsets
8.9.3 Connection of laundry troughs to DN 100 stacks
8.9.4 Steep offsets below the lowest connection
8.9.5 Graded offsets
8.9.6 Connections above the offset
9 General installation of pipework
9.1 Scope of Section
9.2 Support and fixing of pipework
9.2.1 Brackets, clips and hangers
9.2.2 Prohibited supports
9.2.3 Holes in framework
9.3 Location
9.4 Concealment of pipes and fittings
9.4.1 General
9.4.2 Extension of inspection openings
9.4.3 Structural concrete or brickwork
9.4.4 Dry wall construction
9.4.5 Multiple dwellings
9.4.6 Walk-in pipe ducts
9.5 Testing and inspection openings
9.5.1 General requirements
9.5.2 Location of testing and inspection openings
9.5.3 Size of testing and inspection of openings
9.5.4 Access to inspection openings
9.6 Installation of copper and copper alloy pipes
9.6.1 General
9.6.2 Fixing
9.6.3 Expansion joints General Stacks Graded discharge pipes Bedpan sanitizer and washer
9.6.4 Freedom from restraint
9.7 Installation of PVC-U pipes
9.8 Installation of high density polyethylene (PE-HD) pipes
9.9 Installation of FRC pipes
9.10 Disconnection of sanitary plumbing
9.11 Identification of pipes
9.12 Installation of above-ground (elevated) pipework and connection of fixtures using drainage principles
9.12.1 General
9.12.2 Maximum length and size
9.12.3 Permitted installations
9.12.4 Installation
9.13 Installation of boundary traps, reflux valves and gullies above ground within buildings
9.13.1 Boundary traps
9.13.2 Reflux valves
9.13.3 Gullies
9.14 Methods of jointing of pipes
9.14.1 General
9.14.2 Bolted gland joints (BG)
9.14.3 Rubber ring joints (RR)
9.14.4 Epoxy resin joints (ER)
9.14.5 Cement mortar joints (CM)
9.14.6 Silver brazed joints (SB)
9.14.7 Solvent cement joints (SC)
9.14.8 Threaded joints (TH)
9.14.9 Band clamped sleeve joints (BC)
9.14.10 PE-HD joints
9A Reduced velocity aerator stack system
9A.1 Scope and general
9A.1.1 Scope
9A.1.2 General
9A.2 Size of stacks
9A.3 Stack vents
9A.4 Offsets in stacks
9A.5 Aerator junction fittings
9A.5.1 General
9A.5.2 Opposed connections
9A.6 Maximum length of discharge pipes
9A.7 Size of discharge pipes
9A.8 De-aerators
10 Pumped discharge
10.1 Scope of Section
10.2 General
10.3 Compressed air ejection
10.4 Ejector vent
10.5 Wet wells
10.5.1 General
10.5.2 Construction
10.5.3 Materials
10.5.4  Base
10.5.5 Cover
10.5.6 Ladders
10.6 Installation of pumps
10.6.1 General
10.6.2 Inlet to wet well
10.6.3 Venting
10.6.4 Sealing
10.7 Pumped discharges or rising mains
10.8 Pump discharge from waste fixtures
10.8.1 General
10.8.2 Holding tank
10.8.3 Provision of valves
10.8.4 Inlet
10.8.5 Outlet size
10.8.6 Venting
10.8.7 Pump discharge pipe
10.9 ‘Text deleted’
10.10 Small bore macerator pumps
10.11 Electrical connection
11 Fixtures and appliances
11.1 Scope of Section
11.2 Installation of sanitary fixtures for people with disablity
11.3 General installation requirements
11.3.1 Installation of fixtures
11.3.2 Location of fixture traps or self-sealing devices
11.3.3 Untrapped fixtures
11.3.4 Connection of combination fixtures in pairs
11.3.5 Connection of soil fixtures
11.3.6 Fixture grates
11.3.7 Sanitary flushing
11.3.8 Fixture discharge pipes
11.4 Plant rooms
11.5 Pressurized chambers
11.6 Autopsy tables
11.7 Bain-maries and boiling water units
11.8 Basins
11.9 Baths
11.10 Bedpan washers and sanitizers
11.11 Bidets
11.12 Dental units
11.12.1 Single
11.12.2 Multiple
11.13 Drinking fountains
11.14 Food waste disposal units (domestic type)
11.15 Refrigerated, deep-freeze cabinets, commercial coffee-making machines and ice-making machines
11.16 Macerating sanitary napkin disposal units
11.17 Showers
11.17.1 Individual showers
11.17.2 Shower groups
11.17.3 Common channels
11.18 Sinks
11.18.1 Kitchen sinks
11.18.2 Bar sinks
11.18.3 Cleaners’ sinks
11.18.4 Pot, utility and laboratory sinks
11.19 Slop hoppers
11.19.1 Connection
11.19.2 Installation
11.20 Instrument sterilizers and autoclaves
11.21 Connection of tundishes
11.22 Domestic swimming pools
11.23 Troughs
11.23.1 Ablution
11.23.2 Laundry
11.24 Urinals
11.24.1  Slab type
11.24.2 Wall-hung General Flushing wall-hung urinals Non-flushing (waterless) urinals
11.24.3 Conversion to waterless urinals
11.25 Washing machines
11.25.1 Domestic clothes-washing machines
11.25.2 Domestic dishwashing machines Discharge Connection of outlet hose
11.25.3 Commercial clothes-washing machines
11.25.4  Commercial dishwashing machines
11.25.5 Glass-washing machines
11.26 Untrapped floor drains
11.26.1 General
11.26.2 Restrictions on use
11.26.3 Installation
11.26.4 Termination of discharge pipe
11.27 Water closet pans
11.27.1 Connection
11.27.2 Installation
12 Multi-unit developments
12.1 Scope of Section
12.2 Methods of design
12.2.1 General
12.2.2 Maintenance shafts
12.2.3 Inspection shafts and overflow relief gullies and open upstream vents at each individual residential building
13 Testing of sanitary plumbing and sanitary drainage installations
13.1 General
13.2 Hydrostatic test (water test)
13.3 Air pressure test
13.3.1 Sealing inlets and outlets
13.3.2 Air pressure test procedure
13.3.3 Maximum pressure drop permitted
13.4 Vacuum test
13.4.1 Sealing inlets and outlets
13.4.2 Vacuum test procedure
13.4.3 Maximum vacuum drop permitted
13.5 Closed circuit television (CCTV) Inspection
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
E1 General
E2 Operators report
Amendment control sheet
Cited references in this standard
Technical specification for plumbing and drainage products, Part 000: Procedures for certification of plumbing and drainage products
Copper tubes for plumbing, gasfitting and drainage applications
Design for access and mobility — Extracts — Design rules for access by the disabled (Supplement to AS 1428-1977)
Specification and supply of concrete - Commentary (Supplement 1 to AS 1379-2007)
Identification of the contents of pipes, conduits and ducts
Content history
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