(1)
Every potable water system that supplies a fixture or tank that is not subject to pressures above atmospheric shall be protected against back-siphonage by a backflow preventer.
(2)
Where a potable water supply is connected to a boiler, tank, cooling jacket, lawn sprinkler system or other device where a non- potable fluid may be under pressure that is above atmospheric or the water outlet may be submerged in the non- potable fluid, the water supply shall be protected against backflow by a backflow preventer.