Carbon monoxide alarms wrapper
Why you care (60 seconds)
CO alarms are life safety devices often tied to dwelling requirements. Their power source and interconnection requirements are commonly inspected.
Where people lose time
- Installing CO alarms on circuits that can be switched off.
- Missing interconnection or power backup requirements.
- Confusing smoke alarm and CO alarm circuit rules.
This is
The rule in plain language
CO alarms must be powered and interconnected correctly so they remain active and signal occupants as required.
When it applies
Dwelling units where CO alarms are required by code.
What you must do (checklist)
- Identify required CO alarm locations.
- Provide required power source and backup.
- Interconnect alarms where required.
- Confirm listed devices and wiring methods.
Quick examples
- CO alarms should not be on a switched circuit.
- Interconnection is required where multiple alarms are installed.
This is not
Common misreads
- Treating CO alarms as optional where required by building codes.
- Using stand-alone battery-only units where hardwired is required.
What it doesn't cover
- Fire alarm system design for commercial occupancies.
- Building code specifics beyond NEC wiring requirements.
False friends
- A plug-in CO alarm may not satisfy hardwired requirements.
Exceptions & edge cases
- Some retrofit installations allow alternate methods.
- Combined smoke/CO alarms follow both sets of requirements.
Cross-references (NEC map)
- Primary: 760.41
- Secondary: 210.12
Exam traps
- Missing power backup requirements.
- Confusing CO alarm requirements with smoke alarms.
Field notes
- Verify alarm power source and backup during trim.
- Label alarm circuits clearly for inspection.
AHJ / Local amendments notes (placeholder)
- Add local amendments or interpretations here.
Revision notes
- Draft wrapper created for CO alarm fundamentals.