(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 an HVAC system or equipment, and
(e) 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) Where a change in direction of more than 45° occurs in a soil or waste pipe that serves more than one clothes washer, and in which pressure zones are created by detergent suds, no other soil or waste pipe shall be connected to it within a length less than,
(a) 40 times the size of the soil or waste pipe or 2.44 m maximum vertical, whichever is less, before the change in direction, and
(b) 10 times the size of the nominally horizontal soil or waste pipe after the change in direction.
(5) Where a vent pipe is connected into a suds pressure zone referred to in Sentence (4), no other vent pipe shall be connected to that vent pipe within the height of the suds pressure zone.