A battery-operated detector meeting the requirements of NFPA 74, 1989 Edition, is permitted in an existing dwelling that has not undergone remodeling exceeding fifty percent of its assessed value. Detectors must be installed according to manufacturer's instructions.
Battery-operated detectors permitted in certain existing dwellings
S.C. Code Ann. § 5-25-1320, under Title 5, Chapter 25.
S.C. Code Ann. § 5-25-1320