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References

For the purposes of New Zealand Building Code compliance, acceptable reference documents include only the quoted edition and specific amendments as listed below.

Standards New Zealand

NZS/BS 1387: 1985 Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or screwing to BS 21 pipe threads

NZS 3501: 1976 Specification for copper tubes for water, gas, and sanitation

Amends: 1, 2, 3

NZS 4602: 1988 Low pressure copper thermal storage electric water heaters

Amend: 1

NZS 4603: 1985 Installation of low pressure thermal storage electric water heaters with copper cylinders (open-vented systems)

Amend: 1

NZS 4606: Storage water heaters

Part 1: 1989 General requirements

Amends: 1, 2, 3

Part 2: 1989 Specific requirements for water heaters with single shells

Amend: A

Part 3: 1992 Specific requirements for water heaters with composite shells

Amend: A

NZS 4607: 1989 Installation of thermal storage electric water heaters: valve-vented systems

NZS 4608: 1992 Control valves for hot water systems

NZS 4613: 1986 Domestic solar water heaters

NZS 4617: 1989 Tempering (3-port mixing) valves

NZS 5807: 1980 Code of practice for industrial identification by colour, wording or other coding

Part 2: 1980 Identification of contents of piping, conduit and ducts

Amends: 1, 2

NZS 6214: 1988 Thermostats and thermal cutouts for domestic thermal storage electric water heaters (alternating current only)

NZS 6335: 1993 Safety of household and similar electrical appliances. Particular requirements for instantaneous water heaters

Amends: 1, 2

NZS 6401: 1973 Specification for PVC-insulated cables for electric power and lighting

Where quoted

AS1 Table 1

AS1 Table 5

AS1 6.9.1, 6.11.5

Amend 5 Feb 2004

AS1 Table 5

AS1 6.10.1

Amend 5 Feb 2004

AS1 Table 6

AS1 Table 5

AS1 6.14.2 b)

Amend 5 Feb 2004

AS1 4.3.1

AS1 6.5.1

Amend 5 Feb 2004

AS1 Table 5

AS1 9.3.2

6

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Status of Compliance Documents

Compliance Documents are prepared by the Department of Building and Housing in accordance with section 22 of the Building Act 2004. A Compliance Document is for use in establishing compliance with the New Zealand Building Code.

A person who complies with a Compliance Document will be treated as having complied with the provisions of the Building Code to which the Compliance Document relates. However, a Compliance Document is only one method of complying with the Building Code. There may be alternative ways to comply.

Users should make themselves familiar with the preface to the New Zealand Building Code Handbook, which describes the status of Compliance Documents and explains alternative methods of achieving compliance.

Defined words (italicised in the text) and classified uses are explained in Clause A1 of the Building Code and in the Definitions at the start of this Compliance Document.

G12: Document History
	Date	Alterations
First published	July 1992
Amendment 1	September 1993	pp. vi–viii, References p. ix, Definitions p. 15, Table 4 p. 16, 4.5.1, 4.5.3	p. 19, 5.2.2 b) p. 22, Table 7 p. 26, Index
Amendment 2	19 August 1994	pp. i and ii, Document History p. v, Contents p. viii, References p. 3, 2.2.1 e)	p. 6, 2.6, 2.6.1 p. 19, 4.13.1, 4.14, 4.14.1 p. 26, 29, Index
Reprinted incorporating Amendments 1 and 2	October 1994
Amendment 3	1 December 1995	p. ii, Document History pp. vi–viii, References	p. 5, Table 1 p. 6, 2.5.2
Second edition published July 2001	Effective from 1 October 2001	Document revised – Second edition issued
Amendment 4	6 January 2002	pp. 3-5 Code Clause G12
Amendment 5	25 February 2004	p. 2, Document History p.7, Contents pp. 9-11 References	pp. 23-38, 3.7.1, 3.7.4, 4.1, 6.2.1, 6.3.2-6.15, Figure 13 pp. 43-45 Index
Reprinted incorporating Amendments 4 and 5	November 2004
Note: Page numbers relate to the document at the time of Amendment and may not match page numbers in current document.

Document Status

The most recent version of this document, as detailed in the Document History, is approved by the Chief Executive of the Department of Building and Housing. It is effective from 25 February 2004 and supersedes all previous versions of this document.

People using this Compliance Document should check for amendments on a regular basis. The Department of Building and Housing may amend any part of any Compliance Document at any time. Up-to-date versions of Compliance Documents are available from www.dbh.govt.nz

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New Zealand Building Code Clause G12 Water Supplies

The mandatory provisions for building work are contained in the New Zealand Building Code (NZBC), which comprises the First Schedule to the Building Regulations 1992. The relevant NZBC Clause for Water Supplies is G12.

Schedule

Building Amendment Regulations 2001

Schedule

New clause G12 substituted in First Schedule of principal regulations

Clause G12—Water Supplies

Provisions

Objective

G12.1 The objective of this provision is to–

(a) safeguard people from illness caused by contaminated water;

(b) safeguard people from injury caused by hot water system explosion, or from contact with excessively hot water;

(c) safeguard people from loss of amenity arising from–

(i) a lack of hot water for personal hygiene; or

(ii) water for human consumption, which is offensive in appearance, odour or taste;

(d) ensure that people with disabilities are able to carry out normal activities and functions within buildings.

Functional requirement

G12.2 Buildings provided with water outlets, sanitary fixtures or sanitary appliances must have safe and adequate water supplies.

Performance

G12.3.1 Water intended for human consumption, food preparation, utensil washing or oral hygiene must be potable.

G12.3.2 A potable water supply system shall be–

(a) protected from contamination; and

(b) installed in a manner which avoids the likelihood of contamination within the system and the water main; and

(c) installed using components that will not contaminate the water.

G12.3.3 A non-potable water supply system used for personal hygiene shall be installed in a manner that avoids the likelihood of illness or injury being caused by the system.

G12.3.4 Water pipes and outlets provided with non-potable water shall be clearly identified.

Limits on application

Objective G12.1(d) shall apply only to those buildings to which section 47A of the Act applies.

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Building Amendment Regulations 2001

Schedule

Provisions

Performance–continued

G12.3.5 Sanitary fixtures and sanitary appliances must be provided with hot water when intended to be used for–

(a) utensil washing; and

(b) personal washing, showering or bathing.

G12.3.6 Where hot water is provided to sanitary fixtures and sanitary appliances, used for personal hygiene, it must be delivered at a temperature that avoids the likelihood of scalding.

G12.3.7 Water supply systems must be installed in a manner that–

(a) pipes water to sanitary fixtures and sanitary appliances flow rates that are adequate for the correct functioning of those fixtures and appliances under normal conditions; and

(b) avoids the likelihood of leakage; and

(c) allows reasonable access to components likely to need maintenance; and

(d) allows the system and any backflow prevention devices to be isolated for testing and maintenance.

G12.3.8 Vessels used for producing or storing hot water must be provided with safety devices that–

(a) relieve excessive pressure during both normal and abnormal conditions; and

(b) limit temperatures to avoid the likelihood of flash steam production in the event of rupture.

G12.3.9 A hot water system must be capable of being controlled to prevent the growth of legionella bacteria.

G12.3.10 Water supply taps must be accessible and usable for people with disabilities.

Limits on application

Performance G12.3.5(b) shall apply only to housing, retirement homes and early childhood centres.

Performance G12.3.10 applies only to those buildings to which section 47A of the Act applies.

Clerk of the Executive Council.

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References	9
Definitions	13
Verification Method G12/VM1	15
1.0 Water Supply System	15
Acceptable Solution G12/AS1	17
1.0 Scope	17
2.0 Materials	17
2.1 Water quality	17
2.2 Pipe materials	17
3.0 Protection of Potable Water	18
3.1 Drawn water not to be returned	18
3.2 Cross connections prohibited	18
3.3 Cross connection hazard	18
3.4 Backflow protection	19
3.5 Air gap	20
3.6 Backflow prevention devices	20
3.7 Testing	23
4.0 Non-potable Supply	23
4.1 Protection of non-potable water supplies	23
4.2 Outlet identification	23
4.3 Pipeline identification	23
5.0 Water Supply	24
5.1 Water tanks	24
5.2 Water tank installation	24
5.3 Water pipe size	24
5.4 Maintenance facilities	26
6.0 Hot Water Supply System	27
6.1 Water heaters	27
6.2 Water supply to storage water heaters	27
6.3 Operating devices	28
6.4 Safety devices	32
6.5 Temperature control devices	32
6.6 Relief valves	32
6.7 Relief valve drains	33

Amend 5 Feb 2004

6.8 Vent pipes	34
6.9 Alternative acceptable solutions for the installation of open vented storage water heaters	35
6.10 Alternative acceptable solutions for the installation of unvented (valve vented) storage water heaters	35
6.11 Water heater installation	35
6.12 Hot water pipe sizes	36
6.13 Wet-back water heaters	36
6.14 Safe water temperatures	37
6.15 Solar water heaters	38
7.0 Installation Methods	38
7.1 Pipe supports	38
7.2 Protection from freezing	38
7.3 Protection from damage	39
7.4 Installation of uPVC pipes	39
7.5 Watertightness	40
8.0 Usable Facilities for People with Disabilities	40
9.0 Equipotential Bonding	40
9.1 General	40
9.2 Installation of equipotential bonding conductors	41
9.3 Earth bonding conductors	41
Index	43

Amend 5 Feb 2004

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References

For the purposes of New Zealand Building Code compliance, acceptable reference documents include only the quoted edition and specific amendments as listed below.

Standards New Zealand

NZS/BS 1387: 1985 Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or screwing to BS 21 pipe threads

NZS 3501: 1976 Specification for copper tubes for water, gas, and sanitation

Amends: 1, 2, 3

NZS 4602: 1988 Low pressure copper thermal storage electric water heaters

Amend: 1

NZS 4603: 1985 Installation of low pressure thermal storage electric water heaters with copper cylinders (open-vented systems)

Amend: 1

NZS 4606: Storage water heaters

Part 1: 1989 General requirements

Amends: 1, 2, 3

Part 2: 1989 Specific requirements for water heaters with single shells

Amend: A

Part 3: 1992 Specific requirements for water heaters with composite shells

Amend: A

NZS 4607: 1989 Installation of thermal storage electric water heaters: valve-vented systems

NZS 4608: 1992 Control valves for hot water systems

NZS 4613: 1986 Domestic solar water heaters

NZS 4617: 1989 Tempering (3-port mixing) valves

NZS 5807: 1980 Code of practice for industrial identification by colour, wording or other coding

Part 2: 1980 Identification of contents of piping, conduit and ducts

Amends: 1, 2

NZS 6214: 1988 Thermostats and thermal cutouts for domestic thermal storage electric water heaters (alternating current only)

NZS 6335: 1993 Safety of household and similar electrical appliances. Particular requirements for instantaneous water heaters

Amends: 1, 2

NZS 6401: 1973 Specification for PVC-insulated cables for electric power and lighting

Where quoted

AS1 Table 1

AS1 Table 5

AS1 6.9.1, 6.11.5

Amend 5 Feb 2004

AS1 Table 5

AS1 6.10.1

Amend 5 Feb 2004

AS1 Table 6

AS1 Table 5

AS1 6.14.2 b)

Amend 5 Feb 2004

AS1 4.3.1

AS1 6.5.1

Amend 5 Feb 2004

AS1 Table 5

AS1 9.3.2

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clause-g12-3

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References

Status of Compliance Documents

Document Status

New Zealand Building Code Clause G12 Water Supplies

Building Amendment Regulations 2001

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References

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