NCC 2022 Volume Three - Plumbing Code of Australia
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C1
Part C1 Sanitary plumbing systemsPart C1 Sanitary plumbing systems
This Part sets out the requirements for any part of a sanitary plumbing system of a property including from sanitary fixtures and appliances from the point of connection to a sanitary drainage system.
Objectives
C1O1
Objective
2019: CO1
The Objective of this Part is to—
Functional Statements
C1F1
Disposal system
2019: CF1
Sanitary fixtures and sanitary appliances must be provided with an adequate disposal system that does not impact adversely on the occupants of the premises, property, the environment or the Network Utility Operator’s infrastructure.
Performance Requirements
C1P1
Disposal
2019: CP1.1
A sanitary plumbing system must ensure sewage or sullage is transferred to a sanitary drainage system or an approved disposal system.
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.
C1P2
Access
2019: CP1.1
C1P3
Water efficiency
2019: CP1.1
A sanitary plumbing system must ensure efficient use of drinking water by—
The flush volume of C1P3 may be within a tolerance of—
The requirements of C1P3 do not apply to a vacuum drainage system.
C1P4
Uncontrolled discharge
2019: CP1.1
A sanitary plumbing system must avoid blockage or uncontrolled discharge.
C1P5
Ventilation
2019: CP1.1
A sanitary plumbing system must ensure that ventilation is provided to avoid hydraulic load imbalance such that—
C1P5 Ventilation does not apply to vacuum drainage systems.
C1P6
Contamination
2019: CP1.1
A sanitary plumbing system must avoid—
C1P7
Damage
2019: CP1.1
A sanitary plumbing system must avoid damage from superimposed loads, ground movement or root penetration.
Verification Methods
C1V1
Determination of sanitary plumbing wastewater flowrates
New for 2022
Fixture usage | NCC building classes | Frequency factor (K) |
---|---|---|
Intermittent use e.g. dwelling, guesthouse or office | Class 1, Class 2, Class 3 or Class 4 | 0.5 |
Frequent use e.g. hospital, restaurant or hotel | Class 5, Class 6, Class 7, Class 8, Class 9a or Class 9c | 0.7 |
Congested use e.g. open to general public, school | Class 9b | 1.0 |
Special use e.g. laboratory | Not applicable | 1.2 |
Fixture | System 1 | System 2 | System 3 |
---|---|---|---|
Basin | 0.5 | 0.3 | 0.3 |
Shower | 0.6 | 0.4 | 0.4 |
Urinal | 0.8 | 0.5 | 0.4 |
Bath | 0.8 | 0.6 | 1.3 |
Kitchen sink | 0.8 | 0.6 | 1.3 |
Water closet | 2.0 | 1.8 | 1.2 |
Washing machine - up to 6 kg | 0.8 | 0.6 | 0.6 |
Domestic dishwasher | 0.8 | 0.6 | 0.2 |
System types referred to in Table C1V1b are as follows:
C1V2
System 1 - Common discharge design
New for 2022
Water closets must only be connected to a DN 80 or DN 100 discharge pipe.
Common discharge pipe size - Nominal diameter (DN) | Unvented capacity QTotal - Litres per second (l/s) | Vented capacity QTotal - Litres per second (l/s) | Group vent - Nominal diameter (DN) |
---|---|---|---|
40 | 0.50 | N/A | N/A |
50 | 0.80 | 0.75 | 40 |
65 | 1.00 | 1.50 | 40 |
80 | 2.00 | 3.00 | 50 |
100 | 2.50 | 3.75 | 65 |
C1V3
System 2 - Common discharge design
New for 2022
Common discharge pipe - Nominal diameter (DN) | Unvented capacity QTotal - Litres per second (l/s) | Vented capacity QTotal - Litres per second (l/s) | Group vent - Nominal diameter (DN) |
---|---|---|---|
40 | 0.50 | 0.75 | 32 |
50 | 1.00 | 1.50 | 32 |
65 | 1.50 | 2.25 | 40 |
80 | 2.25 | 3.40 | 40 |
100 | 2.50 | 3.75 | 50 |
C1V4
System 3 - Branch design
New for 2022
Fixture | Waste Nominal Diameter (DN) | Maximum length, in metres (m) | Minimum gradient (%) | Maximum gradient (%) | Maximum number of bends | Maximum vertical drop, in metres (m) |
---|---|---|---|---|---|---|
Basin | 32 | 1.7 | 2.2 | 2.2 | 0 | 0 |
Basin | 32 | 1.1 | 4.4 | 4.4 | 0 | 0 |
Basin | 32 | 0.7 | 8.7 | 8.7 | 0 | 0 |
Basin | 40 | 3 | 1.8 | 4.4 | 2 | 0 |
Basin group ≤4 basins | 50 | 4 | 1.8 | 4.4 | 0 | 0 |
Bidet | 32 | 1.7 | 2.2 | 2.2 | 0 | 0 |
Bidet | 32 | 1.1 | 4.4 | 4.4 | 0 | 0 |
Bidet | 32 | 0.7 | 8.7 | 8.7 | 0 | 0 |
Bidet | 40 | 3 | 1.8 | 4.4 | 2 | 0 |
Shower | 40 | No limit | 1.8 | 9 | No limit | 1.5 |
Bath | 40 | No limit | 1.8 | 9 | No limit | 1.5 |
Single urinal | 40 | 3 | 1.8 | 9 | No limit | 1.5 |
Slab urinal | 65 | 3 | 1.8 | 9 | No limit | 1.5 |
Sink - kitchen | 40 | No limit | 1.8 | 9 | No limit | 1.5 |
Trough - laundry | 40 | 3 | 1.8 | 9 | No limit | 1.5 |
Domestic dishwasher | 40 | 3 | 1.8 | 4.4 | No limit | 1.5 |
Domestic clothes washing machine - up to 6 kg | 40 | 3 | 1.8 | 4.4 | No limit | 1.5 |
Water closet | 80 | No limit | 1.8 | No limit | No limit | 1.5 |
Water closet | 100 | No limit | 1.8 | No limit | No limit | 1.5 |
Water closet group ≤8 water closets | 100 | 15 | 0.9 | 9 | 2 | 1.5 |
Food waste disposal unit | 40 | 3 | 13.5 | No limit | No limit | 1.5 |
Sanitary napkin disposal unit | 40 | 3 | 5.4 | No limit | No limit | 1.5 |
Floor waste gully | 50 | No limit | 1.8 | No limit | No limit | 1.5 |
Floor waste gully | 80 | No limit | 1.8 | No limit | No limit | 1.5 |
Floor waste gully | 100 | No limit | 1.8 | No limit | No limit | 1.5 |
Fixture | Waste Nominal Diameter (DN) | Maximum length, in metres (m) | Minimum gradient (%) | Maximum gradient (%) | Maximum number of bends | Maximum vertical drop, in metres (m) |
---|---|---|---|---|---|---|
Basin | 32 | 3 | 1.8 | No limit | 2 | 3 |
Basin | 40 | 3 | 1.8 | No limit | No limit | 3 |
Basin group ≤5 basins | 50 | 7 | 1.8 | 4.4 | No limit | No limit |
Basin group ≤10 basins | 50 | 10 | 1.8 | 4.4 | No limit | No limit |
Bidet | 32 | 3 | 1.8 | No limit | 2 | 3 |
Bidet | 40 | 3 | 1.8 | No limit | No limit | 3 |
Shower | 40 | No limit | 1.8 | No limit | No limit | No limit |
Bath | 40 | No limit | 1.8 | No limit | No limit | No limit |
Single urinal | 40 | 3 | 1.8 | No limit | No limit | 3 |
>1 Single urinal | 50 | No limit | 1.8 | No limit | No limit | No limit |
Trough urinal | 50 | 3 | 1.8 | No limit | No limit | 3 |
Slab urinal | 65 | 3 | 1.8 | No limit | No limit | 3 |
Sink - kitchen | 40 | No limit | 1.8 | No limit | No limit | No limit |
Trough - laundry | 40 | 3 | 1.8 | No limit | No limit | No limit |
Domestic dishwasher | 40 | No limit | 1.8 | No limit | No limit | No limit |
Domestic clothes washing machine (up to 6 kg) | 40 | No limit | 1.8 | No limit | No limit | No limit |
Water closet | 80 | No limit | 1.8 | No limit | No limit | No limit |
Water closet | 100 | No limit | 1.8 | No limit | No limit | No limit |
Water closet group ≤8 | 100 | 15 | 0.9 | No limit | No limit | No limit |
Food waste disposal unit | 40 | 3 | 13.5 | No limit | No limit | 3 |
Sanitary napkin disposal unit | 40 | 3 | 5.4 | No limit | No limit | 3 |
Floor waste gully | 50 | No limit | 1.8 | No limit | No limit | No limit |
Floor waste gully | 80 | No limit | 1.8 | No limit | No limit | No limit |
Floor waste gully | 100 | No limit | 1.8 | No limit | No limit | No limit |
Small potato peeler | 40 | 3 | 13.5 | No limit | No limit | 3 |
C1V5
Stack design
New for 2022
Stack Nominal Diameter (DN) | Capacity with square or 88° junction, in litres per second (l/s) | Capacity with sweep or 45° junction, in litres per second (l/s) |
---|---|---|
65 | 0.5 | 0.7 |
80 | 2.0 | 2.5 |
100 | 4.0 | 5.2 |
150 | 9.5 | 12.4 |
Stack Nominal Diameter (DN) | Capacity with square or 88° junction, in litres per second (l/s) | Capacity with sweep or 45° junction, in litres per second (l/s) |
---|---|---|
65 | 0.7 | 0.9 |
80 | 2.6 | 3.4 |
100 | 5.6 | 7.3 |
150 | 12.4 | 18.3 |
Deemed-to-Satisfy Provisions
C1D1
Deemed-to-Satisfy Provisions
2019: C1.1
C1D2
Invert levels
2019: C1.2
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.
C1D3
General requirements
2019: C1.3
A sanitary plumbing system must be in accordance with AS/NZS 3500.2 subject to the following:
General requirements
A sanitary plumbing system must be in accordance with AS/NZS 3500.2 with the following variations:
General requirements
A sanitary plumbing system must be in accordance with AS/NZS 3500.2.
C1D4
Bushfire prone areas
New for 2022
A sanitary plumbing system in a designated bushfire prone area must be in accordance with AS 3959.
C1D5
Water efficiency
New for 2022
A sanitary plumbing system must ensure the efficient use of drinking water by—
The flush volumes of C1D5 may be within a tolerance of—
The requirements of C1D5 do not apply to a vacuum drainage system.
NCC Volumes One and Two deal with a number of areas of on-site construction which are relevant to sanitary plumbing services. These include, but are not limited to, those listed in Table C1.
Item | 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 | B1 Structural provisions | H1 Structure |
Penetrations for pipework through a vapour barrier | B1 Structural provisions | H1 Structure |
Pipework in timber bearers and joists of solid timber or engineered wood products | B1 Structural provisions | H1 Structure |
Fittings, fixtures and pipework installations in steel framed construction | B1 Structural provisions | H1 Structure |
Penetrations through a fire-resisting wall or floor | C1 Fire resistance Performance Requirements and C4 Protection of openings | H3 Fire safety |
Fixtures and fittings in a wet area | F2 Wet areas and overflow protection | H4 Health and amenity |
Service pipework external to the building and penetrations through roof cladding in a bushfire prone area | G5 Construction in bushfire prone areas | H7 Ancillary provisions and additional construction requirements |
Flues, chimneys, pipes, gas storage, domestic fuel tanks, cooling or heating appliances or other services | C4 Protection of openings | H3 Fire safety |
Pipework sound insulation | F7 Sound transmission and insulation | H4 Health and amenity |
Fixture | System 1 | System 2 | System 3 |
---|---|---|---|
Basin | 0.5 | 0.3 | 0.3 |
Shower | 0.6 | 0.4 | 0.4 |
Urinal | 0.8 | 0.5 | 0.4 |
Bath | 0.8 | 0.6 | 1.3 |
Kitchen sink | 0.8 | 0.6 | 1.3 |
Water closet | 2.0 | 1.8 | 1.2 |
Washing machine - up to 6 kg | 0.8 | 0.6 | 0.6 |
Domestic dishwasher | 0.8 | 0.6 | 0.2 |
Fixture usage | NCC building classes | Frequency factor (K) |
---|---|---|
Intermittent use e.g. dwelling, guesthouse or office | Class 1, Class 2, Class 3 or Class 4 | 0.5 |
Frequent use e.g. hospital, restaurant or hotel | Class 5, Class 6, Class 7, Class 8, Class 9a or Class 9c | 0.7 |
Congested use e.g. open to general public, school | Class 9b | 1.0 |
Special use e.g. laboratory | Not applicable | 1.2 |
Common discharge pipe size - Nominal diameter (DN) | Unvented capacity QTotal - Litres per second (l/s) | Vented capacity QTotal - Litres per second (l/s) | Group vent - Nominal diameter (DN) |
---|---|---|---|
40 | 0.50 | N/A | N/A |
50 | 0.80 | 0.75 | 40 |
65 | 1.00 | 1.50 | 40 |
80 | 2.00 | 3.00 | 50 |
100 | 2.50 | 3.75 | 65 |
Common discharge pipe - Nominal diameter (DN) | Unvented capacity QTotal - Litres per second (l/s) | Vented capacity QTotal - Litres per second (l/s) | Group vent - Nominal diameter (DN) |
---|---|---|---|
40 | 0.50 | 0.75 | 32 |
50 | 1.00 | 1.50 | 32 |
65 | 1.50 | 2.25 | 40 |
80 | 2.25 | 3.40 | 40 |
100 | 2.50 | 3.75 | 50 |
Fixture | Waste Nominal Diameter (DN) | Maximum length, in metres (m) | Minimum gradient (%) | Maximum gradient (%) | Maximum number of bends | Maximum vertical drop, in metres (m) |
---|---|---|---|---|---|---|
Basin | 32 | 1.7 | 2.2 | 2.2 | 0 | 0 |
Basin | 32 | 1.1 | 4.4 | 4.4 | 0 | 0 |
Basin | 32 | 0.7 | 8.7 | 8.7 | 0 | 0 |
Basin | 40 | 3 | 1.8 | 4.4 | 2 | 0 |
Basin group ≤4 basins | 50 | 4 | 1.8 | 4.4 | 0 | 0 |
Bidet | 32 | 1.7 | 2.2 | 2.2 | 0 | 0 |
Bidet | 32 | 1.1 | 4.4 | 4.4 | 0 | 0 |
Bidet | 32 | 0.7 | 8.7 | 8.7 | 0 | 0 |
Bidet | 40 | 3 | 1.8 | 4.4 | 2 | 0 |
Shower | 40 | No limit | 1.8 | 9 | No limit | 1.5 |
Bath | 40 | No limit | 1.8 | 9 | No limit | 1.5 |
Single urinal | 40 | 3 | 1.8 | 9 | No limit | 1.5 |
Slab urinal | 65 | 3 | 1.8 | 9 | No limit | 1.5 |
Sink - kitchen | 40 | No limit | 1.8 | 9 | No limit | 1.5 |
Trough - laundry | 40 | 3 | 1.8 | 9 | No limit | 1.5 |
Domestic dishwasher | 40 | 3 | 1.8 | 4.4 | No limit | 1.5 |
Domestic clothes washing machine - up to 6 kg | 40 | 3 | 1.8 | 4.4 | No limit | 1.5 |
Water closet | 80 | No limit | 1.8 | No limit | No limit | 1.5 |
Water closet | 100 | No limit | 1.8 | No limit | No limit | 1.5 |
Water closet group ≤8 water closets | 100 | 15 | 0.9 | 9 | 2 | 1.5 |
Food waste disposal unit | 40 | 3 | 13.5 | No limit | No limit | 1.5 |
Sanitary napkin disposal unit | 40 | 3 | 5.4 | No limit | No limit | 1.5 |
Floor waste gully | 50 | No limit | 1.8 | No limit | No limit | 1.5 |
Floor waste gully | 80 | No limit | 1.8 | No limit | No limit | 1.5 |
Floor waste gully | 100 | No limit | 1.8 | No limit | No limit | 1.5 |
Fixture | Waste Nominal Diameter (DN) | Maximum length, in metres (m) | Minimum gradient (%) | Maximum gradient (%) | Maximum number of bends | Maximum vertical drop, in metres (m) |
---|---|---|---|---|---|---|
Basin | 32 | 3 | 1.8 | No limit | 2 | 3 |
Basin | 40 | 3 | 1.8 | No limit | No limit | 3 |
Basin group ≤5 basins | 50 | 7 | 1.8 | 4.4 | No limit | No limit |
Basin group ≤10 basins | 50 | 10 | 1.8 | 4.4 | No limit | No limit |
Bidet | 32 | 3 | 1.8 | No limit | 2 | 3 |
Bidet | 40 | 3 | 1.8 | No limit | No limit | 3 |
Shower | 40 | No limit | 1.8 | No limit | No limit | No limit |
Bath | 40 | No limit | 1.8 | No limit | No limit | No limit |
Single urinal | 40 | 3 | 1.8 | No limit | No limit | 3 |
>1 Single urinal | 50 | No limit | 1.8 | No limit | No limit | No limit |
Trough urinal | 50 | 3 | 1.8 | No limit | No limit | 3 |
Slab urinal | 65 | 3 | 1.8 | No limit | No limit | 3 |
Sink - kitchen | 40 | No limit | 1.8 | No limit | No limit | No limit |
Trough - laundry | 40 | 3 | 1.8 | No limit | No limit | No limit |
Domestic dishwasher | 40 | No limit | 1.8 | No limit | No limit | No limit |
Domestic clothes washing machine (up to 6 kg) | 40 | No limit | 1.8 | No limit | No limit | No limit |
Water closet | 80 | No limit | 1.8 | No limit | No limit | No limit |
Water closet | 100 | No limit | 1.8 | No limit | No limit | No limit |
Water closet group ≤8 | 100 | 15 | 0.9 | No limit | No limit | No limit |
Food waste disposal unit | 40 | 3 | 13.5 | No limit | No limit | 3 |
Sanitary napkin disposal unit | 40 | 3 | 5.4 | No limit | No limit | 3 |
Floor waste gully | 50 | No limit | 1.8 | No limit | No limit | No limit |
Floor waste gully | 80 | No limit | 1.8 | No limit | No limit | No limit |
Floor waste gully | 100 | No limit | 1.8 | No limit | No limit | No limit |
Small potato peeler | 40 | 3 | 13.5 | No limit | No limit | 3 |
Stack Nominal Diameter (DN) | Capacity with square or 88° junction, in litres per second (l/s) | Capacity with sweep or 45° junction, in litres per second (l/s) |
---|---|---|
65 | 0.5 | 0.7 |
80 | 2.0 | 2.5 |
100 | 4.0 | 5.2 |
150 | 9.5 | 12.4 |
Stack Nominal Diameter (DN) | Capacity with square or 88° junction, in litres per second (l/s) | Capacity with sweep or 45° junction, in litres per second (l/s) |
---|---|---|
65 | 0.7 | 0.9 |
80 | 2.6 | 3.4 |
100 | 5.6 | 7.3 |
150 | 12.4 | 18.3 |