Part B5 Cross-connection control
Introduction to this Part
The Objective of this Part is to—
- safeguard people from illness, injury or loss (including loss of amenity) due to contamination of a drinking water supply; and
- ensure that a water service installation is suitable; and
- conserve water and energy; and
- safeguard the environment; and
- safeguard public and private infrastructure; and
- ensure that a water service installation throughout its serviceable life will continue to satisfy the requirements of Objectives (a) to (e).
Water services must be designed and installed so as to operate in a way that avoids the likelihood of contamination of any part of the drinking water supply, and minimises any adverse impact on building occupants, the Network Utility Operator's infrastructure, property and the environment.
BP5.1 Contamination control
There are no Verification Methods in this Part.
B5.2 Drinking water service
A hazard exists wherever it is possible for water or contaminants to enter a drinking water service or supply. This is via any potential cross-connection between the drinking water service and any of the following:
Non-drinking water service.
Alternative water supply.
Pipes, fixtures or equipment (including boilers and pumps) containing chemicals, liquids, gases or other substances which may be harmful to health or safety.
Each hazard must—
B5.3 Non-drinking water service
A separate 'non-drinking water service' means one which draws water from a different source. For example, on a site connected to both recycled water and bore water, both are non-drinking water services, but are drawn from separate sources. Therefore, each would be a 'separate non-drinking water service'.
B5.4 Fire-fighting water service
Specification B5.1 Cross-connection hazards
A reference in this Specification to a Type A, B, C or D irrigation system is a reference to such a system as described in Section 7 of AS/NZS 3500.1.
BS5.1.3 Protection types and Hazard Ratings
If this occurs then those regulations and/or rules should be followed in place of this Specification. This Specification only applies for the purposes of compliance with Volume Three of the NCC. It is not intended to limit or extend the application of other regulations.
Fire-fighting water services must be rated in accordance with BS5.1.7.
BS5.1.4 Individual protection
Carbonated drink dispensing machines.
Coils and jackets in heat exchangers, in sealed and non-toxic environments only.
Drink dispensing equipment including vending machines and coffee machines.
Drinking water in reclaimed water plants.
External hose taps.
Fixtures used for ablutions including baths, bidettes, basins and showers.
Fixtures used for food preparation including sinks.
Flexible connections over domestic fixtures.
Food preparation or food storage tanks, vats or vessels (without clean-in-place systems).
A clean-in-place system allows for internal chemical cleaning to occur without the need to disassemble.
Hair salon basins or troughs.
Hose taps located within—
18 m of a Type C irrigation system; or
an area provided with zone protection.
In-line water softeners and filters.
Photographic developers — water supplying rinse tanks.
Photographic processing machines, without developer mixing.
Antibiotic injectors (agricultural).
Bidets and douche hoses.
Chemical dispensers (high toxicity).
Demineralising equipment using ion-exchange resins with acid and alkali regeneration.
Equipment used for handling, mixing, measuring and processing chemical and microbiological substances.
Fogging and cleaning sprays with chemical injection or additives.
Food preparation or food storage tanks, vats or vessels (with clean-in-place systems).
Mixing of chemicals.
Pan washing apparatus.
Photographic developer mixing facilities.
Plants with auxiliary non-drinking water supplies.
Portable and mobile tankers.
Type D irrigation system injected with fertilisers, herbicides, nematicides, insecticides or weedicides.
Weed and pest spraying and water cartage tanks.
BS5.1.5 Zone protection
Dental and medical surgeries.
Fire-fighting water storage tanks.
Food storage tanks, vats or vessels.
Hair salon basins or troughs.
Type B irrigation systems.
Water filtration equipment.
Cooling or heating systems with recirculating water.
Drinking nipples and troughs (agricultural).
Food preparation or food storage tanks, vats or vessels (clean-in-place systems).
In a Class 9c building—
dissecting rooms; and
utility rooms which contain fixtures other than hand basins; and
Industrial and teaching laboratories (except as referred to in BS5.1.5(b)(ii)).
Industrial process water that has been recirculated.
Mortuary equipment used in funeral parlours, mortuaries and autopsy areas.
Sanitary dump points.
Tanks, vats or vessels associated with electroplating, degreasing, descaling, stripping, pickling, dipping or the like.
Type D irrigation systems injected with fertilisers, herbicides, nematicides, insecticides or weedicides.
BS5.1.6 Containment protection
Food and beverage processing plants.
Premises that are also connected to a—
grey-water re-use system; or
reticulated and disinfected reclaimed water system.
Public swimming pool.
Car and plant washing facilities.
Factories using, processing or manufacturing toxic chemicals.
Hospitals, mortuaries, clinics and the like.
Metal finishing plants.
Petroleum processing plants or storage plants.
Piers, docks and other waterfront facilities.
Premises where access to conduct inspections is restricted.
Sewage treatment plants and sewage lift stations.
BS5.1.7 Fire-fighting water services
The following are deemed Low Hazard:
- Domestic (Class 1) fire sprinkler systems.
- FPAA101D fire sprinkler systems.
- Fire-fighting water storage tanks.