What type of electrical box do you use for smoke alarms?


Old 03-15-14, 11:56 PM
Thread Starter
Join Date: Mar 2012
Location: USA
Posts: 384
Received 0 Votes on 0 Posts
What type of electrical box do you use for smoke alarms?

I am mounting a smoke alarm to the ceiling and just want to make sure the pre-wiring is done right. What type of electrical box do you use for mounting a smoke alarm? A rectangular one, round one, or something else?
Sponsored Links
Old 03-16-14, 12:55 AM
Gunguy45's Avatar
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 21,119
Received 2 Votes on 2 Posts
All mine are on round boxes. I imagine the mounting plate would fit either though. IIRC they have multiple holes...but since smokes are round...thats what I'd go with.
Old 03-16-14, 06:39 AM
ray2047's Avatar
Join Date: Mar 2006
Location: USA
Posts: 33,597
Received 13 Votes on 11 Posts
I would suggest a ceiling box, round or octagon, not a switch box. Octagon is the most common, round second. Rectangle I'm guessing refers to switch boxes. Switch boxes use 6-32 fixture screws and are used most often in walls for switches and receptacles. They may not have enough capacity for the wire count if more then two 3-conductor cables . Ceiling boxes use 8-32 fixture screws and have greater capacity then standard depth switch boxes.
Old 03-16-14, 07:06 AM
pcboss's Avatar
Forum Topic Moderator
Join Date: Jul 2002
Location: Maryland
Posts: 14,996
Received 39 Votes on 34 Posts
Either box shape can be used for smokes. The important thing is the box capacity. Make sure it is large enough.
Old 03-16-14, 11:19 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 54,509
Received 504 Votes on 474 Posts
Plastic boxes work particularly well and are easy to use.

Name:  box1.jpg
Views: 3418
Size:  22.1 KB

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: