[no subject]

The new Kidde's use 9V dc to trigger each other, apparently.

The 2 V dc relative to the white neutral that I am seeing is with the red
interconnect wire disconnected from the old ones, and also disconnected from
the new smoke detectors, so the voltage on the wire should, of course, be 0
V.  Should just be "floating," but apparently isn't.

Bob
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"Crash Gordon®" <NONE@xxxxxxxx> wrote in message
news:8jg9e.75$UP5.1472@xxxxxxxxxxxxxxxxxx
Were the reds hooked up to the old detectors?
I'm wondering that maybe the old smokes were retro-fitted on a lighting
circuit to begin with. 30 years ago...smokes weren't required in many areas.


"Robert11" <rgsrose@xxxxxxxxx> wrote in message
news:aZ6dnf7REaBdEPjfRVn-vA@xxxxxxxxxxxxxx
> Hi,
>
> This relates to the problem I've been having in getting 3 new Kidde PI
> 2000
> smoke dectors to talk to each other.  They replaced 3 very old detectors
> which were apparently wired together also. As described in a previous
> post,
> when my new ones were hooked up to
> the third wire (red) they all just cycle on and off.
>
> So, I guess there are two main possibilities, as folks have mentioned:
>
> a. that there is perhaps another detector on the line somewhere that I am
> not
> aware of.  But, I really looked all over, including the attic, and cannot
> find any other.
> Still, it is just about impossible to trace the wires, and maybe there is
> one that was plastered over, or... ?
> 30 yr old house, so anything is possible.
>
> b.  I disconnected the red wires from each detector to the red
> interconnect
> wire interconnecting the 3 new detectors, and measured the voltage
> appearing
> between the interconnect wire and the white neutral.
> Couldn't believe it.  Seems there is about 2 volts AC appearing.
>
> Of all the weird voltages, this is a tough one.
>
> It certainly isn't inductive coupling, but might be "leakage" from
> "something"
>
> Was wondering if any one might have any thoughts on this.
> What uses 2 V AC ?
>
> Sure has me stumped.  Becoming an intellectual challenge by now.
>
> Haven't looked into this yet, but just had the thought that perhaps the
> thermal safety
> cutout (that little downward facing wheel coming out of a 4" gang boxy the
> furnace) on the power to the gas forced hot air furnace we have, is
> connected back to the alarms to indicate if it is ever tripped.
> Perhaps leakage thru this if wired in to the detectors ?  Anyone here ever
> run across anything like this ?
>
> Is this something, or a wiring scheme, they may have used way-back-when,
> or not very likely ?
>
> Thanks,
> Bob
>
>
>