7.4.2.

(1) Every fixture shall be directly connected to a sanitary drainage system, except that,

(a) drinking fountains may be,

(i) indirectly connected to a sanitary drainage system, or

(ii) connected to a storm drainage system provided that where the system is subject to backflow, a check valve is installed in the fountain waste pipe,

(b) laundry plumbing appliances may be indirectly connected to a sanitary drainage system,

(c) fixtures or plumbing appliances, other than floor drains, except as provided in Sentence 7.1.4.2.(2), that discharge only clear water waste may be connected to a storm drainage system,

(d) the following devices shall be indirectly connected to a drainage system:

(i) a device for the display, storage, preparation or processing of food or drink,

(ii) a sterilizer,

(iii) a device that uses water as a cooling or heating medium,

(iv) a water operated device,

(v) a water treatment device,

(vi) a drain or overflow from a water system or a heating system, or

(vii) a drain line from a HVAC system or equipment,

(e) fixtures that have a hydraulic load totaling not more than 1 ½ fixture units may be connected to a vertical section of a circuit vent provided,

(i) the fixtures are located in the same storey as the fixtures served by the vent pipes,

(ii) not more than 2 fixtures are connected to the vent pipe, and

(iii) where 2 fixtures are connected to the vent pipe, the connection is done with a double fitting in conformance with Table 7.2.4.5.,

(f) fixtures that have a hydraulic load totaling not more than 1 ½ fixture units may be connected to the vertical section of a yoke vent provided,

(i) not more than 2 fixtures are connected to the vent pipe, and

(ii) where 2 fixtures are connected to the vent pipe, the connection is done with a double fitting in conformance with Table 7.2.4.5.,

(g) fixtures may be connected to a vent stack provided,

(i) the total hydraulic load of the connected fixtures does not exceed 8 fixture units,

(ii) at least 1 fixture is connected to a vertical portion of the vent stack and upstream of any other fixtures,

(iii) no other fixture is connected downstream of a water closet, and

(iv) all fixtures are located in the lowest storey served by the vent stack, and

(h) floor drains within walk-in coolers shall be connected to a sanitary drainage system,

(i) indirectly with an air break, or

(ii) directly with a backwater valve installed on the drainage system before connection to the sanitary building drain.

(2) The connection of a soil or waste pipe to a nominally horizontal soil or waste pipe or to a nominally horizontal offset in a soil or waste stack shall be respectively at least 1 500 mm measured horizontally from the bottom of a soil or waste stack or from the bottom of the upper vertical section of the soil or waste stack that,

(a) receives a discharge of 30 or more fixture units, or

(b) receives a discharge from fixtures located on 2 or more storeys.

(3) No other fixture shall be connected to a lead bend or stub that serves a water closet.

(4) A soil or waste pipe that serves more than one clothes washer, and in which pressure zones are created by detergent suds, shall not serve for connecting other soil or waste pipes.

(1) An overflow from a rainwater tank shall not be directly connected to a storm drainage system.

(1) Two or more fixture outlet pipes that serve outlets from a single fixture that is listed in Clause 7.4.2.1.(1)(d)v1 may be directly connected to a branch that,

(a) has a size of at least 1 ¼ in., and

(b) is terminated above the flood level rim of a directly connected fixture with a minimum diameter waste of 1 ½ in. to form an air break.

(2) Fixture drains from fixtures that are listed in Subclauses 7.4.2.1.(1)(d)(i)v1 and (ii) may be directly connected to a pipe that,

(a) is terminated to form an air break above the flood level rim of a fixture that is directly connected to a sanitary drainage system, and

(b) is extended through the roof when fixtures that are on 3 or more storeys are connected to it.

(3) Fixture drains from fixtures that are listed in Subclauses 7.4.2.1.(1)(d)(iii)v1 to (vi) may be directly connected to a pipe that,

(a) is terminated to form an air break above the flood level rim of a fixture that is directly connected to a storm drainage system, and

(b) is extended through the roof when fixtures that are on 3 or more storeys are connected to it.

(4) Every waste pipe carrying waste from a device for the display, storage, preparation or processing of food or drink, shall be trapped and have a minimum diameter equal to the diameter of the drain outlet from the device.