NFPA 720-2009: 8 points you should know: NFPA 720-2009 is a complete rewrite of the CO detection standard, which now covers commercial occupancies and impacts CO detector development, installation, testing and off-premise signal transmission.(Life Safety)...
In the U.S., that's National Electrical Code (NEC) [The latest current version as of this writing is the 2023 NEC published in the fall of 2022 - ED.] - see https://www.nfpa.org. In Canada, that's the Canadian Electrical Code (CEC). ...