Moderate to Low. While basic CO alarm installation can be DIY, networked, hardwired systems require proficient electrical knowledge and strict adherence to code, often necessitating a licensed professional for permitting, installation, and inspection.
Installation involves primary power wiring and interconnected systems, requiring adherence to 2023 NEC and 2024 IRC electrical and life safety provisions. Networked systems demand careful planning for device placement and wiring paths, which is standard for residential construction within DuPage County.
Project Guidelines & Rules
General Requirements and Scope
3 Rules
Applicable Codes
2024 International Residential Code (IRC), 2023 National Electrical Code (NEC), Illinois Plumbing Code (as applicable to fuel-fired appliances).
Network Scope
All residential dwelling units containing a fuel-fired appliance or having an attached garage shall be equipped with carbon monoxide alarms. Where more than one alarm is required, they shall be interconnected. (IRC R315.1, R315.5)
Product Listing
All carbon monoxide alarms shall be listed in accordance with UL 2034 or UL 2075. Combination CO/smoke alarms must also comply with UL 217. (IRC R315.3)
Location and Placement
4 Rules
Sleeping Areas
Carbon monoxide alarms shall be installed outside of each separate sleeping area in the immediate vicinity of the bedrooms. (IRC R315.2)
Every Story
Carbon monoxide alarms shall be installed on every story of the dwelling unit, including basements, but not crawl spaces and uninhabitable attics. (IRC R315.2)
Attached Garages
Where an attached garage connects directly to a living space, a carbon monoxide alarm shall be installed within the dwelling unit. (IRC R315.1)
Proximity to Appliances/Sources
Where a fuel-fired appliance is located within a bedroom or its attached bathroom, a carbon monoxide alarm shall be installed within that bedroom. (IRC R315.2 Exception)
Power and Wiring Requirements
4 Rules
Primary Power Source
Carbon monoxide alarms shall receive their primary power from the building wiring and shall be equipped with a battery backup. (IRC R315.4)
Circuit Requirements
The circuit supplying the carbon monoxide alarms shall not be supplied from a circuit that is switched by a wall switch. Wiring shall comply with NEC Article 210 (Branch Circuits). (NEC 210.12(B) and general principles of life safety systems)
Wiring Methods
All electrical wiring shall be installed in accordance with NEC Chapter 3 (Wiring Methods and Materials), ensuring proper conductor sizing, insulation, and protection. (NEC Chapter 3)
Electrical Box Requirements
All electrical boxes for wiring connections shall be properly sized, covered, and accessible in accordance with NEC Article 314. (NEC 314)
Interconnection and Networking
2 Rules
Interconnection Requirement
Where more than one carbon monoxide alarm is required, the alarms shall be interconnected such that the activation of one alarm will activate all alarms in the dwelling unit. (IRC R315.5)
Interconnection Method
Interconnection shall be achieved using listed wiring methods (e.g., standard inter-connect wire provided by manufacturer) or by wireless communication systems, both complying with manufacturer's instructions and NEC Article 760 (Fire Alarm Systems) or 725 (Low-Voltage Circuits) as applicable. (NEC 760, NEC 725)
Installation Best Practices and Regional Considerations
2 Rules
Manufacturer's Instructions
All carbon monoxide alarms shall be installed in accordance with the manufacturer's published installation instructions. (IRC R315.3, NEC 110.3(B))
Environmental Suitability
All devices and wiring shall be suitable for the operational environment, considering temperature and humidity ranges typical for DuPage County, ensuring reliable performance throughout the year. (NEC 110.11)
Permitting, Inspection, and Related Plumbing Considerations
4 Rules
Permit Requirements
Prior to commencing work on hardwired or networked carbon monoxide detection systems, a permit for electrical alterations or new construction containing electrical installations, including life safety systems, shall be obtained from your local building department.
Required Inspections
All electrical work, including the installation and interconnection of carbon monoxide detection systems, shall be subject to inspection by the local building department to ensure compliance with the 2023 NEC and 2024 IRC.
Appliance Venting (Illinois Plumbing Code)
Proper venting and exhaust of all fuel-fired appliances (e.g., furnaces, water heaters, boilers) shall be ensured in accordance with the Illinois Plumbing Code (e.g., Sections 890.1320, 890.1340). Faulty venting is a primary source of carbon monoxide.
Combustion Air (Illinois Plumbing Code)
Adequate combustion air supply for fuel-fired appliances shall be provided per Illinois Plumbing Code requirements (e.g., Sections 890.1300 and 890.1310). Insufficient combustion air can lead to incomplete combustion and CO production, making CO detection critical.
