Re: 2,3,4 wire smoke detectors?

["Buggs" <thatsallfolksl@xxxxxxxxx>]

BoyntonStu wrote:
> On Jul 16, 10:27 pm, Jim <alarmi...@xxxxxxx> wrote:
>> On Jul 16, 7:07 pm, BoyntonStu <s...@xxxxxxxxxx> wrote:
>>
>>> My smoke detectors have 3 wires coming out of them.
>>
>>> Black, white, and yellow.
>>
>>> Black and white fr 110VAC and the yellow for interconnectivity.
>>
>>> All I see discussed is 2 and 4 wire.
>>
>>> Would someone please unconfuse me?
>>
>> 2 and 4 wire smoke detectors as referred to in this group, are low
>> voltage devices used in alarm installations. The one's you are
>> talking about are 110vac units.
>
> Do any 2 or 4 wire units have battery backup?

They are powered by the alarm control, which has a battery backup. There are
no batteries in the detectors themselves.
js