NCC 2016 Volume Three
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Section C Sanitary Plumbing and Drainage Systems

Section C Sanitary Plumbing and Drainage Systems

Part C2 Sanitary Drainage Systems

Delete C2.2(a) and insert ACT C2.2(a) as follows:

ACT C2.2 General requirements

(a)

The design, construction, installation, replacement, repair, alteration and maintenance of a sanitary drainage system must be in accordance with the following:

(i)

AS/NZS 3500.2 with the following variations and additions:

(A)

Substitute clause 4.5.2 as follows:

4.5.2

A reflux valve cannot replace an overflow relief gully (ORG) at any time.

(B)

After clause 4.7, insert clause 4.7A as follows:

4.7A

Sewer manholes shall be installed at the following locations:

(a)

at the beginning and end of any line DN 150 or larger; and

(b)

at any change of direction on a line DN 150 or larger; and

(c)

at the junction of two pipes both of which are DN 150 or larger; and

(d)

at the confluence of three or more pipes where any of the pipes are DN 150 or larger; and at intervals of not more than 100 metres on any line that is DN 150 or larger.

(C)

Substitute 14.2.3 as follows:

14.2.3
(a)

The multi-unit development requires one complying overflow relief gully as specified in clause 4.6.6.

(b)

Additional overflow relief from sewerage surcharge. The gully shall comply with clause 4.6.6.6, but have a reduced minimum height of 100 mm.

(c)

An inspection shaft in accordance with clause 4.4.2, immediately upstream of the junction with the main line of the sanitary drain.

(d)

An open upstream vent.

(ii)

The requirements of this Part.

After C2.2(c) insert ACT C2.2 (d), (e), (f), (g) and (h) as follows:

Section C Sanitary Plumbing and Drainage Systems

(d)

The drainage of a dwelling or building on a single parcel of land cannot be combined with a drain of a dwelling or building on another parcel of land. The drainage of each dwelling or building must—

(i)

be separate from another dwelling or building.

(ii)

Despite (i), the construction occupations registrar may approve a combined drainage system, if satisfied that special reasons exist for doing so.

(e)

An interceptor trap and accesshole must—

(i)

be carried to ground level; and

(ii)

be fitted at that level with approved cast-iron airtight covers.

(f)

All new property connections shall include an inspection shaft, where the difference in elevation between the drain and sewer tie warrants a graded jump-up, they will rise at 45 degrees unless constricted by space or specified to be vertical. The base of the vertical jump-ups shall be located immediately upstream of the inspection opening which must be as close to the property boundary as possible or adjacent to the tie. If located in a driveway, a trafficable lid must be provided over the shaft.

(g)

All vertical jump ups on house drainage must be extended to ground level and finished with a removable inspection opening.

(h)

Building over drains:

When an extension, fully enclosed structure or the like passes over an existing drain, that part of the drain shall be tested for soundness as per section 15 of AS/NZS 3500.2, or clause 4.47 of AS/NZS 3500. If the drain is found to be defective then it should be satisfactorily repaired or replaced.