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J604.1 Smoke Alarms
When interior alterations occur, or when one or more sleeping rooms are added or created in existing dwellings, the individual dwelling unit shall be provided with smoke alarms located as required for new dwellings; the smoke alarms shall be interconnected and hard wired.

Exception:
In other than bed and breakfast dwellings, smoke alarms in existing areas shall not be required to be interconnected and hard wired where interior wall or ceiling finishes are not removed to expose the structure.
J604.1.1 Power Source
Smoke alarms shall be permitted to be battery operated when installed in buildings without commercial power or an on-site electrical power system, or in buildings where existing interior wall or ceiling finishes are not removed to expose the structure.
J604.1.2 Interconnection
Smoke alarms shall not be required to be interconnected where battery operated alarms are permitted.
J604.2 Carbon Monoxide Alarms
When level 2 alterations occur, the individual dwelling unit shall be provided with carbon monoxide alarms as required for new dwellings.

Exception:
In other than bed and breakfast dwellings, carbon monoxide alarms and carbon monoxide detectors may be battery operated, cord-type or direct plug when installed in buildings without an electrical power source, or in buildings where existing interior wall or ceiling finishes are not removed to expose the structure.
J604.3 Automatic Sprinkler Systems
A third story above grade may be created in an existing attic without requiring the installation of a sprinkler system throughout the entire dwelling, provided all of the following conditions are met:
  1. The building was legally occupied before January 1, 1984.
  2. The finished space and its means of egress to the exterior are equipped with a limited area sprinkler system installed in accordance with NFPA 13D.
  3. The finished space is provided with:
    1. A second exit stair meeting the requirements of Section R311.5, or
    2. An emergency escape and rescue opening, meeting the requirements of Section R310, located directly above a roof or other structural appurtenance from which access to grade does not exceed a vertical distance of 14 feet.
  4. The entire dwelling is equipped with smoke alarms in compliance with Section R313 and monitored by an approved supervising station in accordance with NFPA 72.

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