Smoke alarm circuits wrapper
Why you care (60 seconds)
Smoke alarms are life safety devices. Circuit requirements are inspected closely and miswiring can leave occupants unprotected.
Where people lose time
- Using the wrong circuit type for smoke alarms.
- Forgetting AFCI requirements where applicable.
- Missing interconnection requirements for multiple alarms.
This is
The rule in plain language
Smoke alarms must be supplied and interconnected correctly so they operate as required and remain protected.
When it applies
Dwelling units and areas that require smoke alarms and alarm interconnection.
What you must do (checklist)
- Identify required alarm locations and circuiting method.
- Provide required interconnection where applicable.
- Apply AFCI requirements to alarm circuits if required.
- Confirm listed alarm equipment and wiring methods.
Quick examples
- Smoke alarms in sleeping areas must be interconnected.
- Alarm circuits can require AFCI depending on location.
This is not
Common misreads
- Treating alarm circuits like general lighting circuits.
- Installing stand-alone alarms where interconnection is required.
What it doesn't cover
- Fire alarm system design for commercial occupancies.
- Low-voltage system wiring beyond basic alarm requirements.
False friends
- A smoke alarm on a switched circuit is not acceptable.
Exceptions & edge cases
- Certain retrofit conditions allow alternative interconnection methods.
- Mixed battery and hardwired systems may have special allowances.
Cross-references (NEC map)
- Primary: 210.12
- Secondary: 760.41
Exam traps
- Missing interconnection requirements.
- Ignoring AFCI requirements on alarm circuits.
Field notes
- Verify interconnection during rough and trim phases.
- Label alarm circuits clearly at the panel.
AHJ / Local amendments notes (placeholder)
- Add local amendments or interpretations here.
Revision notes
- Draft wrapper created for smoke alarm circuit fundamentals.