(1) After a section of a potable water system has been completed, and before it is placed in operation, a water test or an air test shall be conducted.
(2) A test may be applied to each section of the system or to the system as a whole.
(3) Where a prefabricated system is assembled off the building site in such a manner that it cannot be inspected and tested on site, off-site inspections and tests shall be conducted.
(4) Where a prefabricated system is installed as part of a water system,
(a) all other plumbing work shall be tested and inspected, and
(b) the complete system shall be pressure tested.