(1)
Water service pipes shall be sized according to the peak demand flow but shall not be less than NPS ¾.
(2)
Except as provided in Sentence (3), the nominal pipe size of a supply pipe that serves a fixture shall conform to Table 7.6.3.2.-A.
(3)
For fixtures listed in Table 7.6.3.2.-A that are permitted to have an NPS ⅜ supply pipe, a connector not more than 750 mm long and not less than NPS ¼ may be used to supply water to the fixture.
(4)
No water system between the point of connection with the water service pipe or the water meter and the first water distribution pipe that supplies a water heater that serves more than one fixture shall be sized less than NPS ¾.
(5)
Except as permitted in Sentence (6), where both hot and cold water is supplied to fixtures in residential buildings containing one or two dwelling units or row houses with separate water service pipes, the water system may be sized in accordance with Table 7.6.3.4., where
(a)
the hydraulic loads for maximum separate demands on water distribution system piping are not less than 100% of the total hydraulic load of the fixture units given in Table 7.6.3.2.-A, 7.6.3.2.-B, 7.6.3.2.-C or 7.6.3.2.-D for private use,
(b)
the minimum water pressure at the entry to the building is 200 kPa, and
(c)
the total maximum length of the water system is 90 m. (See Note A-7.6.3.4.(5))
(6)
Where both hot and cold water is supplied to fixtures in a house containing only one dwelling unit, the water service pipe is permitted to be a minimum of NPS ¾ in provided,
(a)
a minimum NPS ¾ water supply piping located in the basement or lower level is extended to the base of every hot and cold riser that serves a maximum of one bathroom group and to the last water supply branch serving any basement bathroom group, fixture supply or hose bibb, and
(b)
the total hydraulic load is not more than 26 fixture units, using the values given in Table 7.6.3.2.-A.
Table 7.6.3.4. Water Pipe Sizing for Buildings Containing One or Two Dwelling Units or Row Houses with Separate Water Service Pipes
Forming Part of Sentence 7.6.3.4.(5)
Notes to Table 7.6.3.4.: