2 Wire Vs. 4 Wire Fire Alarm Cables Factory Suppliers Manufacturers Quotes

2 Wire Vs. 4 Wire Fire Alarm Cables

The Majority of U.S. homes have installed a fire alarm system. However not all homes have one that will work in an emergency. The reason alarms fail to work is various, such as a dead battery or a frayed wire. Luckily, 2-wire and 4-wire systems are relatively easy to install, operate and monitor.

 

2-Wire

Two-wire fire and smoke alarm units are powered from the circuitry on the control panel. The two wires power the system and trigger the alarm at the same time. Before installing, you have to make sure that your control panel is compatible with a 2-wire system. When the system detects smoke, it sends an electrical short to the circuitry panel, which then triggers the system to sound an alarm.

4-Wire

Four-wire alarm systems set apart the powering and triggering by using different wires. Two of the four wires generate the power for the smoke alarm, and other two wires for signaling. Therefore, a four-wire system can self-activate, but a two-wire system cannot.

Considerations

If you made your mind to use four-wire smoke detectors, consider installing separate power monitors on the last wire for the alarms and the last wire for the power. The power monitor wire to ensure that the alarm and power wires are receiving power at all times. If something goes wrong with the system and there is no fire, the faulty wire will set off the alarm, alerting you to repair the corresponding wire for either the power or the fire alarm.

References

· National Fire Protection Association: Smoke Alarm Safety Tips

· Fire Department New York: Smoke Alarm Guide

· Wire It Yourself: Do It Yourself Home Security and Fire Systems

· Smart Home USA: System Sensor 4-Wire, Photoelectric

· National Fire Protection Association: Smoke Alarms

· AlarmTech: How Smoke Detectors Work

· AlarmSystemStore.com: System Sensor 4W-B Four Wire Smoke Detector


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