1.1 These requirements cover the construction and performance of inferential type residential water flowmeters intended for use on cold water supplies when:
a) Connected directly to residential sprinkler fire protection systems; or
b) Connected to combined domestic plumbing and residential sprinkler fire protection service (multipurpose fire protection system) when installed as specified in the Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, NFPA 13D.