Have three ceiling mounted, AC powered, smoke detectors which need
replacement after 8 years or so.
These have the additional feature that if one goes off, they all do, as
they are wired "together"
Cost is not a concern.
Are there any "semi-professional" models available rather than the
typical HD ones ?
Might anyone recommend a brand and model number for wired-together AC
powered smoke detectors that they have had good luck with.
New baby, so false tripping is a real concern.
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I'd just look into combination type. I have flame/smoke sensor combo,
smoke/gas combo throughout the house some with 10 year battery back up
in addition to AC power and some has light as well as audible alarm..
On Wednesday, April 2, 2014 5:46:05 PM UTC-4, Bob wrote:
What you're asking for isn't a special feature, it is a code requirement.
That said, Gentex GN303 was typical go-to for hotel rooms etc. when I did s
uch things. 7139 series if you need a strobe (for a bedroom used by someon
e hearing impaired.) make one of them a 9123F if you want to tie into your
security system as a fire point (that is compatible with the GN303 and wil
l provide a Form C relay contact that will change state when any of your de
tectors go into alarm.)
Also be aware that it used to be a requirement for detection only outside o
f sleeping areas now it is inside and outside (plus at least one on every l
evel of the house) so if you are trying to bring everything up to code you
may want to consider adding detectors in the bedrooms.
I don't know if the Gentex smokes really are the best, but they seem to be
very popular for commercial non-system smokes e.g. condos, hotel rooms, etc
On Friday, April 4, 2014 1:59:47 PM UTC-4, N8N wrote:
such things. 7139 series if you need a strobe (for a bedroom used by some
one hearing impaired.) make one of them a 9123F if you want to tie into yo
ur security system as a fire point (that is compatible with the GN303 and w
ill provide a Form C relay contact that will change state when any of your
detectors go into alarm.)
of sleeping areas now it is inside and outside (plus at least one on every
level of the house) so if you are trying to bring everything up to code yo
u may want to consider adding detectors in the bedrooms.
e very popular for commercial non-system smokes e.g. condos, hotel rooms, e
Maybe you know the answer to something else. Is battery power also
required today even if they are AC powered? Maybe it is in some places?
Here, in NJ, new construction seems to be using onese that are both.
Personally, I would just use AC powered if allowed. The thing I can't
understand is why with the AC powered ones that also have batteries, the
batteries barely last a year. You would think that if they have AC,
they would only use the batteries if they have to and they'd last a
lot longer. Having to replace all those batteries is a PIA and I'd
be perfectly fine with just AC powered ones. But I wonder if code
where the OP is might require batteries in addition to AC now?
The NEC has a note under 210.12 (AFCIs)
"See NFPA ... 72-2010, National Fire Alarm and Signaling Code, for
information related to secondary power supply requirements for smoke
alarms installed in dwelling units."
"Secondary power" (battery) is required if circuits are powered by
AFCIs. I presume those circuits are more likely to go dead early in a fire.
I have no idea how widely NFPA 72 is enforced. Or requirement could also
be in local regulations.
On Sunday, April 6, 2014 2:16:31 PM UTC-4, bud-- wrote:
Thanks for the info. Interesting. It's probably based more on
guesses than any hard data. Personally, I'm OK with the level of
protection of AC ones without the battery backup. But what really
pisses me off is that the ones that were AC/battery that I've had
the displeasure of being involved with, the batteries only last
a year, just like a battery powered smoke detector. You would think
it would use AC, with the battery there aa backup and it would be
good for say 3 years.
Do the batteries last a year or is that the recommended time to change
them? Unused, batteries have a long shelf life, but once used only a
short time gets the chemical reaction going and reduces the time.
As for AC only, that is great as long as you have power. Problem is,
when power goes out, people will bring out the kerosene lamps, propane
heaters, start the fireplace or woodstove. Without battery backup your
detectors will be out of commission when needed the most.
On Sunday, April 6, 2014 6:53:25 PM UTC-4, Ed Pawlowski wrote:
No, the time from putting in brand new ones to them giving a warning
beep that the battery is going is about a year, sometimes less.
Yes, I agree that's one drawback. But I'd be willing to take that
small gap in coverage. Especially since I don't have kerosene heaters
propane heaters, etc. Even candles, which we used to use decades ago
during power outages have largely been replaced by LED lanterns, etc.
But you're right for many people that's when they do stupid things, during power outages and it's the main advantage to the battery type. On
the other hand, I'd be willing to bet a lot more people have died from
having just battery operated ones, where the batteries were dead,
than there are people who had AC ones and the power was off when the fire
They should have hard-wired DC units running on a "centralized"
battery like many emergency lighting systems - powered by a AC/DC
converter on a day-to-day basis, with a fail-over to the (big)
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