Notes to Table 7.2.7.4.:
7.4.9.3. Size of Fixture Outlet Pipes (1) Except as provided in Sentence (2), the size
of every fixture outlet pipe shall conform to Table 7.4.9.3. Table 7.4.9.3.   Minimum Permitted Size of Fixture Outlet Pipe and Hydraulic Loads for Fixtures Forming Part of Sentences 7.4.9.3.(1) and 7.4.10.2.(1) Item   Column 1 Fixture   Column 2 Minimum Size of Fixture Outlet Pipe, in.   Column 3 Hydraulic Load, fixture units 

  1.   Autopsy table   1 ½   2 

  2.   Bathroom group         

       (a) with flush tank       6 

       (b) with direct flush valve       8 

  3.   Bathtub (with or without shower)   1 ½   1 ½ 

  4.   Bath: foot, sitz or slab   1 ½   1 ½ 

  5.   Bed pan washer   3   6 

  6.   Beer cabinet   1 ½   1 ½ 

  7.   Bidet   1 ¼   1 

  8.   Chinese range   1 ½   3 

  9.   Clothes washer         

       (a) domestic   N/A   1 ½ with 2 in. trap 

       (b) commercial   N/A   2 with 2 in. trap 

  10.   Cup Sinks   1 ¼   ½ 

  11.   Dental unit or cuspidor   1 ¼   1 

  12.   Dishwasher         

       (a) domestic   1 ½   1 (no load if connected to garbage grinder or domestic sink) 

            

            

       (b) commercial type   2   3 

  13.   Drinking fountain   1 ¼   ½ 

  14.   Fish tank or tray   1 ½   1 ½ 

  15.   Floor drain   2   2 with 2 in. trap 

              3 with 3 in. trap 

  16.   Garbage grinder, commercial type   2   3 

  17.   Icebox   1 ¼   1 

  18.   Laundry tray         

       (a) single or double units or 2 single units with common trap    1 ½   1 ½ 

            

       (b) 3 compartments   1 ½   2 

  19.   Lavatory         

       (a) barber or beauty parlor   1 ½   1 ½ 

       (b) dental   1 ¼   1 

       (c) domestic type single, or 2 single with common trap   1 ¼   1 with 1 ¼ in. trap 

              1 ½ with 1 ½ in. trap 

       (d) multiple or industrial type   1 ½   3 

  20.   Macerating Toilet System   3/4   4 

  21.   Potato Peeler   2   3 

  22.   Shower drain         

       (a) from 1 head   1 ½   1 ½ 

       (b) from 2 or 3 heads   2   3 

       (c) from 4 to 6 heads   3   6 

  23.   Sink         

       (a) domestic and other small type with or without garbage grinders, single, double or 2 single with a common trap   1 ½   1 ½ 

            

       (b) other sinks   1 ½   1 ½ with 1 ½ in. trap 

              2 with 2 in. trap 

              3 with 3 in. trap 

  24.   Urinal         

       (a) pedestal, siphon jet or blowout type   2   4 

       (b) stall, washout type   2   2 

       (c) wall         

        (i) washout type   1 ½   1 ½ 

        (ii) other types   2   3 

  25.   Water closet         

       (a) with flush tank   3   4 

       (b) with direct flush   3   6 (2) The part of the fixture outlet pipe that is common to three compartments of a sink shall be one size
larger than the largest fixture outlet pipe of the compartments that it serves. (3) Where clothes washers do not drain to a laundry tray, the trap inlet shall be fitted with a vertical standpipe that is not less than 600 mm long measured from the trap weir and the top of the standpipe shall terminate above the flood level rim of the clothes washer it serves.