(A) The type of protection required under § 52.25(C)(1) through (C)(3) shall depend on the degree of hazard which exists as follows:
(1) An approved fixed proper air gap separation shall be installed where the public water supply system may be contaminated with substances that could cause a severe health hazard.
(2) An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention device shall be installed where the public water supply system may be contaminated with substances that could cause a severe health hazard.
(3) An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention device shall be installed where the public water supply system may be polluted with substances that could cause a pollution hazard not dangerous to health.
(B) The type of protection required under § 52.25(C)(4) and (C)(5) shall be an approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention device.
(C) Where a public water supply or an auxiliary water supply is used for a fire protection system, reduced pressure principle backflow preventers shall be installed on fire safety systems connected to the public water supply when:
(1) The fire safety system contains antifreeze, fire retardant or other chemicals;
(2) Water can be pumped into the system through an outside siamese connection;
(3) Water flows by gravity from a non-potable source; or water, can be pumped into the fire by safety from any other source;
(4) There is a connection whereby the fire safety system pressure can be increased by a booster pump.
('95 Code, §52.66) (Ord. 93-25, passed 8-10-93; Am. Ord. 03-41, passed 8-20-03)