A fire alarm system is an important part of any building’s safety plan. It helps to detect a fire early on, alert the occupants of the building, and call for help. A fire alarm system can be wired in different ways depending on its size and complexity. In this article, we will discuss the 2 wire fire alarm wiring diagram, its components, and how it works.
Components of a 2 Wire Fire Alarm System
A 2 wire fire alarm system consists of the following key components:
- Control panel – This is the brain of the system. It receives signals from the detectors and sounds the alarm.
- Detectors – These are devices that detect smoke, heat or flames and send a signal to the control panel.
- Sounders – These are devices that produce an audible alarm when the control panel signals it to do so.
- Manual call points – These are buttons that occupants can push to manually trigger the alarm.
- Power supply – This supplies power to all the components of the system.
Wiring Diagram
The wiring diagram for a 2 wire fire alarm system is shown below:
| Component | Wire Color | Terminal Number |
|---|---|---|
| Detector | Red | 1 |
| Detector | Black | 2 |
| Sounder | Red | 3 |
| Sounder | Black | 4 |
In a 2 wire fire alarm system, the detectors and sounders are connected to a common pair of wires. This means that only one wire is used for power and signal transmission. The other wire is used as a ground connection.
The detectors are wired in parallel, which means that if one detector detects a fire, it sends a signal to the control panel which then signals all the sounders to sound the alarm.
FAQs
What is the advantage of a 2 wire fire alarm system?
The main advantage of a 2 wire fire alarm system is that it is simple and cost-effective. Since only two wires are used for power and signal transmission, installation and maintenance costs are lower compared to other types of systems.
Can a 2 wire fire alarm system be used in large buildings?
Yes, a 2 wire fire alarm system can be used in large buildings. However, it is not recommended for very large or complex systems as it may not be able to handle the load. For larger buildings, a more advanced fire alarm system may be required.
What should I do if the fire alarm goes off?
If the fire alarm goes off, you should evacuate the building immediately and follow the emergency procedures in place. Do not try to investigate the source of the fire or turn off the alarm. Wait for the emergency services to arrive and follow their instructions.
How often should a fire alarm system be tested?
A fire alarm system should be tested at least once a year by a qualified technician. In addition, regular testing of the system’s components and batteries should be carried out to ensure that they are functioning properly.
What happens if a detector or sounder fails?
If a detector or sounder fails, it should be replaced as soon as possible. A failed component could compromise the safety of the building and its occupants. Regular maintenance and testing of the system can help to detect and replace failed components before they become a safety hazard.
Conclusion
A 2 wire fire alarm system is a simple and cost-effective solution for small to medium-sized buildings. It is important to ensure that the system is installed and maintained by a qualified technician to ensure its proper functioning.
