Re: House 110V smoke

[RickP@xxxxxxxxx]

"FIRETEK" <firetech(change-the-ch-to-k)@telus.net> wrote:

>
><RickP@xxxxxxxxx> wrote in message
>news:5rh5n2lmej3m6foc8cm6f2g3ccnenvfu4l@xxxxxxxxxx
>> "Rich" <Rich3784@xxxxxxxxx> wrote:
>
>>
>> The yellow or "tandem" wire is used to place other detectors in the
>> house (same model number)  in alarm and can not be used to drive a
>> relay.  Most tandem outputs are from 3-6 vdc and not 120vac...
>> remember, this must also function while running off the 9 volt
>> battery.

>That's not universally true.  I know of at least one smoke alarm family
>where the "tandem wire" _isn't_ "low voltage".  I imagine that because the
>don't have battery backup, they can't be used in many jurisdictions in the
>US, though.

Well, since the gentleman asking the original question says his
detector has battery backup, the tandum output must be low voltage to
meet the interconnectivity requirement.

>> If the detectors have auxilliary alarm contacts or a auxilliary relay
>> option, use them instead.  However, ALL detector contacts or relays in
>> the house must be used in parellel because they do not transfer when
>> receiving an alarm via the tandem connection.
>
>Boy are you ever wrong.  The "tandem connection" is used by the listed relay
>as well.  http://www.icca.invensys.com/firex/accessories.htm

Okay, you've peaked my interest - I've never seen this device before.

BUT, this Firex detector and the  #499 accessory relay you refer to
are both 120vac devices and have no battery backup capability, which
as you stated, can't be used in many jurisdictions today.

I'm seeing some info on the web about a Firex #498 relay which appears
to have the capability of being wired off a DC operated detector
tandem connection.  It's not on their website however and may have
been discontinued.

Thanks for the update...

Rick P.