7.6.1.

(1) Potable water systems shall be designed, fabricated and installed in accordance with good engineering practice, such as that described in the ASHRAE Guide and Data Books, the ASHRAE Handbooks and ASPE Data Books.

(2) Every fixture supplied with separate hot and cold water controls shall have the hot water control on the left and the cold on the right.

(3) Where hot and cold water are mixed and the temperature is regulated by a single, unmarked, manual control, a movement to the left shall increase the temperature and a movement to the right shall decrease the temperature.

(4) In a hot water distribution system of a developed length of more than 30 m or supplying more than 4 storeys, the water temperature shall be maintained by,

(a) recirculation, or

(b) a self-regulating heat tracing system.

(1) A water distribution system shall be installed so that the system can be drained or blown out with air and outlets for this purpose shall be provided.

(1) A building control valve shall be provided,

(a) on every water service pipe at the location where the water service pipe enters the building, or

(b) on the water distribution system at a location immediately downstream of the point of entry treatment unit, where the building is served by a point of entry treatment unit located in the building.

(2) Except as provided in Sentence (3), a drain port shall be provided on the water distribution system immediately downstream of the building control valve required by Sentence (1) and if there is a meter, the drain port shall be installed immediately downstream of the meter on the water distribution system.

(3) Where the building control valve required by Sentence (1) is of one in. trade size or smaller, the drain port may be an integral part of the building control valve in the form of a stop and waste valve and the drain port shall be located on the water distribution system side of the stop and waste valve.

(4) Every pipe that is supplied with water from a tank on the property that is a gravity water tank or a tank of a drinking-water system shall be provided with a shut-off valve located close to the tank.

(5) Where the water supply is to be metered, the installation of the meter, including the piping that is part of the meter installation and the valving arrangement for the meter installation, shall be according to the water purveyor's requirements.

(6) For the purpose of identifying the pipe material where plastic (polybutylene, polyethylene or PVC) water pipe is used underground for a service pipe, the end of the pipe inside the building shall be brought above ground for a distance not less than 300 mm and not greater than 450 mm.

(1) Except for a single-family dwelling, every riser shall be provided with a shut-off valve at the source of supply.

(1) Every water closet shall be provided with a shut-off valve on its water supply pipe.

(1) Shut-off valves shall be installed in every suite in a building of residential occupancy as may be necessary to ensure that when the supply to one suite is shut off the supply to the remainder of the building is not interrupted.

(1) The water supply to each fixture in a washroom for public use shall be individually valved and each valve shall be accessible.

(1) Every water pipe that supplies a hot water tank, pressure vessel, plumbing appliance or water using device shall be provided with a shut-off valve located close to the tank, pressure vessel, plumbing appliance or water using device.

(1) Every pipe that passes through an exterior wall to supply water to the exterior of the building shall be provided with,

(a) a frost-proof hydrant with a separate shut-off valve located inside the building, or

(b) a stop-and-waste cock located inside the building and close to the wall.

(1) A check valve shall be installed at the building end of the water service pipe where the pipe is made of plastic that is suitable for cold water use only.

(1) Every flushing device that serves a water closet or one or more urinals shall have sufficient capacity and be adjusted to deliver at each operation a volume of water that will thoroughly flush the fixture or fixtures that it serves.

(2) Where a manually operated flushing device is installed it shall serve only one fixture.

(1) Every pressure vessel that is part of a plumbing system or connected to a plumbing system shall be equipped with a pressure relief valve designed to open when the water pressure in the tank reaches the rated working pressure of the tank, and so located that the pressure in the tank shall not exceed 1100 kPa or ½ the maximum test pressure sustained by the tank whichever is the lesser.

(2) Every hot water tank of a storage-type service water heater shall be equipped with a temperature relief valve with a temperature sensing element,

(a) located within the top 150 mm of the tank, and

(b) designed to open and discharge sufficient water from the tank to keep the temperature of the water in the tank from exceeding 99⁰C under all operating conditions.

(3) A pressure relief valve and temperature relief valve may be combined where Sentences (1) and (2) are complied with.

(4) Every indirect service water heater shall be equipped with,

(a) a pressure relief valve, and

(b) a temperature relief valve on every storage tank that forms part of the system.

(5) Every pipe that conveys water from a temperature relief, pressure relief, or a combined temperature and pressure relief valve shall,

(a) be of a size at least equal to the size of the outlet of the valve,

(b) be rigid, slope downward from the valve, and ,

(i) terminate with an indirect connection above a floor drain, sump or other safe location, with an air break of not more than 300 mm, or

(ii) terminate at a distance not less than 150 mm and not more than 300 mm from a floor and discharges vertically down,

(c) have no thread at its outlet, and

(d) be capable of operating at a temperature of not less than 99°C.

(6) The temperature relief valve required in Clause (4)(b) shall,

(a) have a temperature sensing element located within the top 150 mm of the tank, and

(b) be designed to open and discharge sufficient water to keep the temperature of the water in the tank from exceeding 99°C under all operating conditions.

(7) No shut-off valve shall be installed on the pipe between any tank and the relief valves or on the discharge lines from such relief valves.

(1) Except as provided in Sentence (2), a system for solar heating of potable water shall be installed in accordance with good engineering practice.

(2) Packaged systems for solar heating of potable water in residential occupancies shall be installed in conformance with CAN/CSA-F383, “Installation Code for Solar Domestic Hot Water Systems”.

(1) Provision shall be made to protect the water distribution system from the adverse effects of water hammer.

(1) A water service pipe intended to serve a mobile home shall,

(a) be not less than ¾ in. size,

(b) be terminated above ground, and

(c) be provided with,

(i) a tamperproof terminal connection that is capable of being repeatedly connected, disconnected and sealed,

(ii) a protective concrete pad,

(iii) a means to protect it from frost heave, and

(iv) a curb stop and a means of draining that part of the pipe located above the frost line when not in use.

(1) Protection against thermal expansion shall be required when a check valve is required by Article 7.6.1.10., a backflow preventer is required by Article 7.6.2.2., or a pressure reducing valve is required by Article 7.6.3.3.