2150 version 3
28-Jun-16
1 of 3
PLUMBING
Design water supply backflow
protection systems
level:
5
credit:
6
planned review date:
April 1998
sub-field:
Plumbing, Gasfitting and Drainlaying
purpose:
This unit standard is for people who work, or intend to work
in plumbing. People credited with this unit standard will be
able to determine system requirements and design water
supply backflow protection systems.
entry information:
Open.
accreditation option:
Evaluation of documentation and visit by NZQA and
industry.
moderation option:
A centrally established and directed national moderation
system has been set up by The Skills Organisation.
special notes:
New Zealand Building Code and Approved Documents:,
G10 Piped Services, G12 Water Supplies, Manufacturers'
specifications, Water supply protection regulations, NZS
3501: 1976, NZS 4219: 1983, NZS 5807 Part 2: 1980, BS
1723 Part 1: 1986, BS 1845: 1984, AS 1167 Part 1: 1984,
AS 3500 Part 1: 1992, Health and Safety in Employment Act
1992.
 New Zealand Qualifications Authority 2016
2150 version 3
28-Jun-16
2 of 3
PLUMBING
Design water supply backflow
protection systems
Elements and Performance Criteria
element 1
Determine water supply backflow protection system requirements.
performance criteria
1.1
Water supply backflow hazard is identified and listed.
1.2
Hazard type is categorised in accordance with Acts and Codes, refer special
note.
1.3
Devices and components are selected in accordance with Acts and Codes,
refer special note.
element 2
Design water supply backflow protection system.
Range:
air gap, reduced pressure backflow prevention device, double check valve,
hose connection vacuum break, single check valve.
performance criteria
2.1
The water supply backflow protection systems are explained
2.2
Water supply backflow protection system design and detail specifications
conform to provisions of Acts, Standards Codes and manufacturers'
instructions, refer special note.
 New Zealand Qualifications Authority 2016
2150 version 3
28-Jun-16
3 of 3
PLUMBING
Design water supply backflow
protection systems
element 3
Maintain safe working environment.
performance criteria
3.1
Work practices are carried out without injury to worker, public, or damage to
building, other services, tools or equipment, refer special note.
Comments to:
The Skills Organisation
Freepost 5164
PO Box 24-469
Royal Oak
Auckland 1345
.
Please Note:
Providers must be accredited by the Qualifications Authority
before they can offer programmes of education and training
assessed against unit standards.
Accredited providers assessing against unit standards must
engage with the moderation system that applies to those unit
standards. [Please refer to relevant Plan ref: 0008]
 New Zealand Qualifications Authority 2016