17. Urinals
(1) The urinal shall be provided with a basin stall, trough or other suitable receptacle or receptacles of non-absorbent material and the outlet therefrom shall be provided with a sufficient grating.
(2) Where a water supply is available the urinal shall be provided with suitable apparatus for the effectual flushing and cleansing of the receptacles provided but no part of the urinal apparatus shall be directly connected with a water distributing pipe.
(3) If the urinal can be entered from within the building and is constructed so as to discharge into a soil pipe which also receives the discharge from another urinal or from a water closet, bath, sink, lavatory, basin or the like the urinal shall be provided with a sufficient trap and the trap of the urinal shall be ventilated by an anti-syphonage pipe having an internal diameter of not less than that of the trap or 2 inches whichever is the less and be connected with the waste pipe from the urinal at a point not less than 3 and not more than 12 inches from the highest part of the trap on that side of the water seal which is nearer to the soil pipe and shall have an open end as high as the top of the soil pipe or shall be carried into the soil pipe at a point not less than 3 feet above the highest connection to the soil pipe.