The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Calling all Non-US members!! (Non-US only)
by aussie240
Today at 02:39 AM
Photo Upload Tutorial
by DanK
Yesterday at 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
2 registered (LongRunner, Tjia1981), 178 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 3 1 2 3 >
Topic Options
Rate This Topic
#161980 - 04/11/07 05:53 AM Smoke Alarms
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
Since most manufacturers of single station smoke alarms are limiting you to between 10 and 12 units on a circuit, what does one do when you need more than 12 units for a home?
_________________________
George Little

Top
2014 / 2011 NEC & Related Books and Study Guides
#161992 - 04/11/07 09:38 AM Re: Smoke Alarms [Re: George Little]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
I suppose you will need to find a manufacturer that doesn't have the restriction or find one with a "repeater" type adapter to link 2 loops.
In real life I would expect a home that big to have a real alarm system. Even my wife's micro mansions (2000-4000 sq/ft) had a system that picked up the smokes, CO, pool alarm and intrusion alarm.
_________________________
Greg Fretwell

Top
#162026 - 04/12/07 01:54 AM Re: Smoke Alarms [Re: gfretwell]
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Greg some areas will not allow a fire alarm system to take the place of the required smoke alarms.

I don't know the solution to the question.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

Top
#162046 - 04/12/07 09:53 AM Re: Smoke Alarms [Re: iwire]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
Bob that seems strange to me but I never underestimate the absurdity of government.
_________________________
Greg Fretwell

Top
#162051 - 04/12/07 10:59 AM Re: Smoke Alarms [Re: George Little]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
Off the cuff, I don't see a problem.

The limit seems to be based upon the current they need when in alarm. This has nothing to do with interconnection.

I would think that you could continue to link them all together with that third wire, even if the detectors are powered by different circuits.

Top
#162057 - 04/12/07 12:00 PM Re: Smoke Alarms [Re: renosteinke]
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
I just inspected a home that had a need for 31 yes THIRTY ONE, smoke alarms and while it appears that it would be possible to interlock them electrically with some sort of relay system- the manufacturers tell me that that's not allowed due to the listing. As for a Fire alarm system- The State of Michigan will recognize it as satifying the requirements as called out in the Michigan Residential Code (same as the IRC only with the Michigan spin).
_________________________
George Little

Top
#162078 - 04/12/07 05:47 PM Re: Smoke Alarms [Re: George Little]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
I am wrong about the alarm system. My wife says no, they use stand alone smokes.
Everything else is on the central system.

Give me a break, I have already been punished ;\)
_________________________
Greg Fretwell

Top
#162079 - 04/12/07 05:51 PM Re: Smoke Alarms [Re: gfretwell]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
Reno, what exactly does go down that 3d wire and would the smokes being on opposite phases change anything?
Do all brands work the same way?
I have never really looked into this.
_________________________
Greg Fretwell

Top
#162086 - 04/12/07 07:09 PM Re: Smoke Alarms [Re: gfretwell]
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
As I understand it, that third wire only links some contacts together ... it there's continuity in one detector, they all sound off.

Top
#162087 - 04/12/07 07:14 PM Re: Smoke Alarms [Re: renosteinke]
frenchelectrican Offline

Member

Registered: 02/06/03
Posts: 938
Loc: Wi/ Paris France { France for ...
 Originally Posted By: renosteinke
As I understand it, that third wire only links some contacts together ... it there's continuity in one detector, they all sound off.


Yes that true John but if you have third wire interconneted and also the netural line as well as common return [ i have little trouble to grasp this idea how it work ]

but for hot's line it can be on common or diffrent phase or leg but i am sure but not excat answer for this one but i am thinking out loud that both red [ interconnection ] and white wires to actavie it

Merci , Marc
_________________________
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


Top
Page 1 of 3 1 2 3 >



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals