§ 52.027 TYPE OF PROTECTION REQUIRED.
   (A)   The type of protection required under § 52.026 shall depend on the degrees of hazard which exist as follows:
      (1)   An approved proper air gap separation shall be installed where the public water supply system may be contaminated with substances that would cause a severe health hazard;
      (2)   An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention assembly shall be installed where the public water supply system may be contaminated with a substance that could cause a system or health hazard; and
      (3)   An approved fixed proper air gap separation or an approved reduced pressure principle backflow prevention assembly or a double check valve assembly 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 § 52.026 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 is pumped into the system from another source;
      (3)   Water flows by gravity from a non-potable source; or water can be pumped into the fire safety system from any other source; and
      (4)   There is a connection whereby another source can be introduced into the fire safety system.
   (D)   All other fire safety systems connected to the potable water supply shall be protected by a double check valve assembly on metered service lines and a double detector check valve assembly on unmetered service lines.
(Prior Code, § 52.13) (Ord. 91-5, passed 8-19-1991)