Existing Group I-1 and R occupancies must be provided with smoke alarms in accordance with Section 907 of the Chicago Building Code. Interconnection and power sources must be in accordance with Sections 14X-5-504.8.2 and 14X-5-504.8.3, respectively.
Exceptions:
1. Where the code that was in effect at the time of construction required smoke alarms and smoke alarms complying with those requirements are already provided.
2. Where smoke alarms have been installed in occupancies that were not required to have them at the time of construction, additional smoke alarms are not required provided that the existing smoke alarms comply with requirements that were in effect at the time of installation.
3. Where smoke detectors connected to a fire alarm system have been installed as a substitute for smoke alarms and the system provides required occupant notification.