How does a 2 wire smoke detector work?

How do you wire a 2-wire smoke detector?

Connecting 2 wire Smoke Detectors

1. Take off 4-6 inches from the outer jacket.
2. Each conductor should be stripped of approximately 1/4 inch of insulation
3. As shown in the wiring diagram, connect each wire to the 2 wire smoke terminals.
4. Connect the 2-conductor wire to the terminals using the end-of–line resistor (EOLR), if you are using it.

What wire is used to power smoke detectors? The 120VAC power supply for smoke detectors is provided by the hot (black), and neutral (white). The red wire is used to transmit interconnect alarm signals. When one alarm is activated, it will trigger the other alarms.

You might also wonder, "How does a 2-wire fire alarm system work?"

The two wire system allows detectors, callpoints and alarm devices to be wired together on the same pair of two-core zone cables that return to the control panel. It can use one circuit per zone, without needing to create a separate sounder circuit.

What's the difference between 4 and 2 wire smoke detectors?

There is a difference between a 2 wire and a 4 wire smoke detector for an alarm system. The wires are connected to the PGM terminals of your alarm. 4 Wire Smoke Detectors wires provide power from the security systems auxilliary output connectors. A second set of 2 wires is used to connect to the zone input of the security system.