(A) All connections for fire sprinkler systems connected with the public water system shall be protected with an approved double check valve assembly as a minimum requirement. All fire systems using toxic additives or booster pumps shall be protected by an approved reduced pressure principle device at the main.
(B) Dead ends such as fire hydrants piped in excess of 50 inches from a potable source must be protected from backflow with a minimum approved double check valve assembly installed within 50 inches from potable connection.
(2003 Code, § 25-605)