NCC 2019 Volume Three Amendment 1
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Part C2 Sanitary drainage system

Part C2 Sanitary drainage system

Vic Introduction to this Part

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 drainage system of a property including from sanitary fixtures and appliances to an approved disposal system.

Explanatory information:

Explanatory information:

OBJECTIVE

CO2

The Objective of this Part is to—

  1. safeguard people from illness, injury or loss (including loss of amenity) due to the failure of a sanitary drainage installation; and
  2. ensure that a sanitary drainage installation is suitable; and
  3. conserve water and energy; and
  4. safeguard the environment; and
  5. safeguard public and private infrastructure; and
  6. safeguard people from illness caused by the discharge of swimming pool waste water; and
  7. protect other property from damage caused by the discharge of swimming pool waste water; and
  8. ensure that a sanitary drainage installation is designed and is capable of being maintained so that throughout its serviceable life it will continue to satisfy Objectives (a) to (g).

FUNCTIONAL STATEMENTS

CF2.1

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.

NT CF2.2

CF2.2

Adequate means for the disposal of swimming pool waste water and drainage is to be provided to each swimming pool.

Performance Requirements

CP2.1 Design, construction and installation

(1)

A sanitary drainage system must ensure the following:

(a)

Sewage is transferred from a sanitary plumbing system to an approved disposal system.

(b)

Access for maintenance and clearing blockages.

(c)

Ventilation to avoid foul air and gases accumulating in the sanitary drainage and sewerage system.

(d)

Protection against internal contamination.

(2)

A sanitary drainage system must avoid the following:

(b)

Damage from root penetration, superimposed loads or ground movement.

(c)

Entry of water, foul air and gases from the system into buildings.

(d)

Entry of surface water, sub-surface water and stormwater into the system.

(e)

Damage to existing buildings or site works.

(f)

Damage to the Network Utility Operator's sewerage system or other approved disposal system.

Vic CP2.101

NT CP2.2

CP2.2 Swimming pool drainage

(1)

A swimming pool must have adequate means of draining the pool in a manner that will not—

(a)

cause illness to people; or

Verification Methods

Vic CV2.1

CV2.1 Velocity and liquid-to-air ratio

(1)

Compliance with CP2.1(2)(a) is achieved if the sanitary drainage system is designed to operate with—

(a)

a liquid-to-air ratio of between 1:1 and 0.65:0.35; and

(b)

a minimum velocity of 0.8 m/s; and

(c)

a maximum velocity of—

(i)

2 m/s under normal operating conditions; and

(ii)

3.5 m/s under surge conditions.

Explanatory information:

Explanatory information:
  • The symbol 'm/s', used in CV2.1, means 'metres per second'.
  • The purpose of the minimum velocity is to minimise the likelihood of blockage in the sanitary drainage system. The maximum velocity is intended to minimise the likelihood of damage to the system.

Vic CV2.2

CV2.2 Pressure testing

(1)

Compliance with CP2.1(2)(a) is achieved if the sanitary drainage system passes one or more of the pressure tests set out in Section 15 of AS/NZS 3500.2.

Deemed-to-Satisfy Provisions

C2.1 Application

(1)

Performance RequirementsCP2.1 and CP2.2 are satisfied by complying with C2.2 to C2.4.

C2.2 Invert levels

(1)

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.

NT C2.3

C2.3 Swimming pool drainage

(1)

Where pumped discharge from a swimming pool connects to a gully riser it must be installed in accordance with AS/NZS 3500.2.

Tas C2.3(2), (3)

ACT Appendix

C2.4 General requirements

NSW C2.4(1)

NT C2.4(1)

Vic C2.4(1)

(1)

The design, construction, installation, replacement, repair, alteration and maintenance of a sanitary drainage system must be in accordance with AS/NZS 3500.2.

Vic C2.4(2), (3), (4), (5)

Explanatory information: Cross-volume considerations

Explanatory information

Explanatory information: Cross-volume considerations
NCC Volumes One and Two deal with a number of areas of on-site construction which are relevant to a sanitary drainage system. These include, but may not be limited to, the following:

Item

NCC Volume One Class 2 to 9 buildings

NCC Volume Two Class 1 and 10 buildings

Excavations for pipework adjacent to a building and footings

B1 Structural provisions

3.1.1 Earthworks

Termite management for attachments to buildings and penetrations through a slab

B1 Structural provisions

3.1.4 Termite Risk management

Penetrations for pipework through a vapour barrier

B1 Structural provisions

3.2.2 Preparation

Pipework in timber bearers and joists of solid timber or engineered wood products

B1 Structural provisions

3.4.0 Framing

Fittings, fixtures and pipework installations in steel framed construction

B1 Structural provisions

3.4.2 Steel framing

Penetrations through a fire-resisting wall or floor

C3 Protection of openings

3.7.3 Fire protection of separating walls and floors