2,3,4 wire smoke detectors?

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.

Thanks,

Do low voltage 2 and 4 wire smoke detectors also have battery backup?

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

Technically, they all do. The battery is in the alarm control panel.

Do any 2 or 4 wire units have battery backup?

it would be weird if they did

| > > 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? |