Residential smoke detectors

[Teddy714]

Hello what is the NEC code for residential smoke detector separation from walls ?
My understanding it can’t be placed in the first 4” from ceiling and wall , I was told it had to be install with in 12” .

 

[infinity]

That's correct minimum 4" down and no more than 12" below the ceiling.

 

[Teddy714]

Does that also apply for ceiling installation?

 

[infinity]

This graphic may help with smoke alarm placement:

Welcome to the Forum.

 

[McLintock]

Ok, if you had a vaulted ceiling that was 21’ to the peak, where would you guys put it? It must be serviceable right?


“ shoot low boys their riding shetland ponies”

 

[tom baker]

Keep in mind this is not an NEC requirement, but from the fire code. NEC only covers the wiring to the detectors if they AC

 

[gadfly56]

This graphic may help with smoke alarm placement:

Welcome to the Forum.

The 4x4 exclusion zone has been removed from NFPA-72 since the 2010 edition. No longer applies.

 

[gadfly56]

Ok, if you had a vaulted ceiling that was 21’ to the peak, where would you guys put it? It must be serviceable right?


“ shoot low boys their riding shetland ponies”

At 21 feet, most designers would be considering beam detectors, but not for residential. You'll need a heck of an A-frame ladder or a Genie lift. See NFPA 72 for more discussion on smoke detectors/alarms on sloped ceilings.