The Ontario Building Code | Traps for Sanitary Drainage Systems
188.8.131.52. Traps for sanitary Drainage Systems
(1) Except as provided in Sentences (2) and (3) and Article 184.108.40.206., every fixture shall be protected by a separate trap.
(2) One trap may protect,
(a) all the trays or compartments of a two or three compartment sink,
(b) a two or three compartment laundry tray, or
(c) two similar type single compartment fixtures located in the same room.
(a) are in the same room, and
(b) are not located where they can receive food or other organic matter.
(5) A grease interceptor shall not serve as a fixture trap and eachfixture discharging through the interceptor shall be trapped and vented.
(6) Where a domestic dishwashing machine equipped with a drainage pump discharges through a direct connection into the fixture outlet pipe of an adjacent kitchen sink or disposal unit, the pump discharge line shall,
(a) rise as high as possible to just under the counter, and
(i) on the inlet side of the sink trap by means of a Y fitting, or
(ii) to the disposal unit.