AS/NZ 3500.2
What is the maximum allowable length for the combined unvented drain and fixture discharge pipe?
The combined length of an unvented drain and fixture discharge pipe should not exceed 10 meters.
What requirement exists for vent pipes in areas prone to freezing?
in areas where the vent pipe is susceptible to freezing, it must be insulated from the top of the storage water heater to a point no less than 300 mm above the normal standing water level in the vent pipe.
What is the specified maximum working pressure for any sanitary fixture or sanitary appliance?
The working pressure at any sanitary fixture or appliance should not exceed 500 kPa (equivalent to 50 meters head).
How should the water supply system be tested to ensure watertightness?
NZBC G12
An acceptable testing method is to subject the hot and cold system to a pressure of 1500 kPa for a period of not less than 15 minutes.
What is the maximum distance permitted for the placement of pressure relief valves from the storage water heater, as outlined in the regulation
positioned no further than 1 meter away from the storage water heater.
What is the requirement regarding the height of the inlet of a low-level vent, also known as a ground vent?
150 mm above ground level
What is the maximum allowable hot water temperature at the outlet of sanitary fixtures used for personal hygiene in certain facilities?
The maximum allowable hot water temperature at the outlet of sanitary fixtures used for personal hygiene is 45°C for early childhood education and care centers, schools, old people’s homes, institutions for people with psychiatric or physical disabilities, and hospitals.
What do the variables Hm represent in the context of plumbing systems?
When installing water services in metal wall frameworks when there are no pre-existing holes what size hole should be made
32 mm when there are no pre-existing holes
What are the specific requirements regarding the placement of temperature/pressure relief valves as per the provided regulation?
The probe of the valve should be situated within the top 20% of the water capacity
and
The distance from the top of the container to the temperature/pressure relief valve should not exceed 150 mm
What is the minimum thickness of reinforced concrete required for paving over drains constructed with less than the minimum cover specified in Table 3.7.2, if the area is subject to heavy vehicular loading?
100 mm
Why should the storage water heater control thermostat be set at a temperature of not less than 60°C, regardless of the installation of a delivery temperature control device?
to prevent the growth of Legionella bacteria
what is the acceptable Flow Rate and temperature of a shower
0.1 l/s at 42 °C
Maximum spacing of brackets and clips for a 25 mm horizontal PE pipe
0.75 m
What safety devices are mandated for valve vented (unvented) systems, as per the specified regulation?
A combined temperature/pressure relief valve for systems with a working pressure exceeding or below 120 kPa.
or
An energy cut-off for each heating unit in gas and electric systems
What is the minimum required separation between any underground drain and an electrical supply cable if the electrical supply cable is neither indicated nor protected?
600mm
What is the recommended cover location for drains in residential driveways and similar areas that are occasionally subjected to heavy traffic?
the recommended cover location for drains is 600 mm.
specified in Table 3.2.1.What is the requirement for the minimum working pressure at the furthest or most disadvantaged fixture or outlet?
AS/NZ 3500.1
The minimum working pressure at the furthest or most disadvantaged fixture or outlet should not be less than 50 kPa (equivalent to 5 meters head), at the flow rate specified in Table 3.2.1.
What is the regulation regarding the proximity of water services where two or more water services are installed in a private easement?
AS/NZ 3500.1
According to the regulation, where two or more water services are installed in a private easement, they must not cross or be closer than 100 mm to each other.
What are two design requirements for energy cut-off devices, as stipulated by the regulation
1) They should be reset manually.
2)They must disconnect the energy supply before the water temperature surpasses 95°C.
Under what conditions can drains below ground and under buildings be laid with less than the minimum cover specified in Table 3.7.2?
if there is a minimum of 25 mm of overlay separating the drain from a reinforced concrete slab.
At what liter capacity must a drain pipe be installed regarding a storage water heater
Storage water heaters with a capacity exceeding 45 liters must be equipped with drain pipes.
What is the maximum m/s allowable water velocity in piping according to the requirements?
AS/NZ 3500.1
The maximum allowable water velocity in piping is 3.0 m/s.
What are the requirements for products containing copper alloy and intended for use with potable water for human consumption starting September 1, 2025?
The lead content within such products must not exceed a weighted average of 0.25%.
What types of storage water systems are wet-back water heating systems permitted to be connected to, according to the regulation?
Wet-back water heating systems are only allowed to be connected to open vented storage water heaters or open vented storage water vessels, as specified in the regulation