Section 27-980. Power sources of smoke detecting devices

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Dwelling units
  shall be equipped with smoke detecting devices receiving  their  primary
  power  from  the  building  wiring and there shall be no switches in the
  circuit  other  than  the  over-current  device  protecting  the  branch
  circuit;  provided,  however,  that dwelling units in existing buildings
  may,  in  the  alternative,  be  equipped  with  battery-operated  smoke
  detecting devices except where such buildings are substantially improved
  or altered on or after January first, nineteen hundred eighty-two.

                    
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