Subsection 916.2 - Primary Power to CO Alarms/DetectorsRequired carbon monoxide alarms, carbon monoxide detectors, combination smoke/carbon monoxide alarms or combination smoke/carbon monoxide detectors shall receive their power by one of the following means:
1. Listed carbon monoxide alarms shall receive their primary power from the building wiring when such wiring is served from a commercial source and without a disconnecting switch other than those required for overcurrent protection. Listed carbon monoxide alarms that are only battery-powered, plug-in or plug-in with battery backup shall not be permitted in new construction.2. Listed carbon monoxide detectors shall receive their power from the approved control panel. The approved control panel shall receive its primary power from the building wiring when such wiring is served form a commercial source and without a disconnecting switch other than those required for overcurrent protection.3. Listed low-power radio frequency (wireless) detectors shall be permitted to be battery powered when the battery is electrically supervised and shall be capable of sending an alarm signal to the approved control panel for a minimum of seven days after sending the initial battery depletion signal. 916.2.1 Secondary Power to CO Alarms/Detectors. All CO alarms/detectors shall have secondary (standby power supplied from monitored batteries or other recognized sources of secondary power in accordance with NFPA 72. For fire alarm control units (panels), the panel battery can serve as the source of secondary electrical power. For wireless systems, the panel battery can serve as the source of secondary electrical power.