How Commercial Fire Alarm Systems Work

Mammoth Takeaways

• Types of Commercial Fire Alarm Systems: There are several types of fire alarm systems for commercial use, including conventional, addressable, automatic, wireless, and hard-wired systems, each with distinct features and benefits.
• Components of Fire Alarm Systems: Key components of a commercial fire alarm system include the fire alarm control panel (FACP), pull stations, smoke detectors, heat detectors, flame detectors, and sprinkler systems.
• Fire Risk Assessments and Compliance: Regular fire risk assessments and compliance with fire alarm regulations are essential for ensuring safety, maintaining system functionality, and adhering to legal standards.

Commercial fire alarm systems protect businesses every day from the threat of fire.

But what is a commercial fire alarm exactly, and how does it work?

We’re going to explore the different fire alarm systems available for commercial use, their parts, and how they all work together to protect your livelihood.

Types of Commercial Fire Alarm Systems

There are a few different common setups of fire alarm systems currently on the market for commercial fire alarms. Below are the main distinguishing features of those types.

Conventional

The original standard of commercial fire alarms, these systems break up a commercial space or building into what are called “zones”. When a sensor detects a triggered alarm, the Fire Alarm Control Panel (FACP) displays which zone the event is occurring in. Zones are typically determined by floor, but they can be broken up into different orientations depending on the building. This method is effective but not as precise as more modern addressable systems.

Addressable

An addressable fire alarm system is one that uses technology to assign unique addresses to the sensors and devices attached to the system. This means that every heat detector, smoke alarm, and sprinkler has its own unique identity in the system. The reason this is beneficial is that when a fire triggers the alarm, the FACP can identify the exact location of the triggering event. The result is a fast response and an easier way to pinpoint the fire and extinguish it, reducing overall damage.

Automatic

This configuration is just as it sounds, automatic. Using a variety of sensors and different technology, these systems are able to monitor, sense, locate, and suppress fires. These systems offer the advantage of keeping your premises protected even when no one is present. This setup can also be connected to a monitoring center that can dispatch help to fight the fire.

Wireless

The term wireless refers to the method of connection and communication between the system and its parts. A wireless system uses radio waves to communicate and transmit data. The technology surrounding wireless fire alarms has vastly improved since its invention and is now considered a viable, safe, and convenient option. There are no wires installed in this variation.

Hard-wired

Using the traditional method of connection, hard wired systems use physical cabling to connect devices together. This method creates a more stable form of data transfer, but requires more work to install, and may be more expensive to run in a complicated building layout. The benefit of a wired system is the reliability and protection against any interference of the signal.

Components of a Fire Alarm System

As you know, a fire alarm isn’t just a singular device, rather, it’s an intricate network of specialized equipment working together to protect the building it’s installed in. Below are some of the common parts of a fire alarm system in a commercial building.

Fire Alarm Control Panel (FACP)

The fire alarm control panel is the main hub of the system. This instrument uses microprocessor technology to receive, interpret, and send data throughout the connected system. Think of the FACP as the brain of the entire unit. When a device senses smoke or fire, the FACP is immediately notified. It verifies the information (meaning it checks to see if there is a false alarm or malfunction), and if validated, it will start the fire alarm protocols.

The protocol could range from sounding alarms and activating strobes to contacting a monitoring center to dispatch the authorities. The exact functions are determined and programmed during installation. 

Pull Stations

Pull stations are the physical apparatuses that allow people to manually activate a fire alarm. These are clearly visible and easily accessible, usually at the entrances and exits of the building. These devices feature either a single pull lever or a two-step pull lever activation.

Smoke Detectors

• Photoelectric: By utilizing a light beam and sensor, the photoelectric smoke alarm variant can detect smoke particles when the light beam is interrupted. When the sensor cannot detect the beam of photons, the alarm is activated.
• Ionization: These devices are equipped with a negligible amount of radioactive material, typically Americium-241. This element generates an ionized field between two charged metal plates. When this flow is disturbed by smoke, the alarm triggers. The radioactive material is not harmful to humans so long as the device is used properly and not broken.

Heat Detectors

• Rate-of-Rise (RoR): Using two thermal resistors, this unit compares the ambient temperature of the location against the radiant heat temperature. When the difference between the two rises to 12°-15°, the alarm is activated. This sudden rise in temperature typically happens in the presence of a growing flame.
• Fixed Temperature: This version is equipped with a special alloy that melts at a specified temperature. When the temperature in the room where the sensor is located reaches its threshold, the alarm is triggered.

Flame Detectors

Using Ultraviolet (UV) or infrared (IR), this device employs technology to detect certain patterns and bands of radiation to determine if there’s a fire. A flame detector can also sense fire according to the air temperature and airflow. These components are typically used in commercial buildings where there is highly flammable material.

Sprinkler Systems

Sprinkler systems can be automatically activated through their own sensor, or they can be instructed to activate by the FACP after verification of a threat. A standard sprinkler system disperses water in the area per a flow rate and spread that is predetermined by the regulations of the NFPA.

Importance of Fire Risk Assessments

Fire risk assessments are essential for identifying potential fire hazards within a building and implementing measures to mitigate these risks. These assessments involve a thorough inspection of the location, evaluating fire prevention measures, and ensuring that fire alarm systems and other safety protocols are in place and functioning correctly. Regular fire risk assessments help to maintain a safe environment, reduce the chances of fire-related events, and ensure compliance with fire safety regulations.

Compliance with Fire Alarm Regulations

Fire alarm regulations vary by region but generally include standards for system installation, maintenance, and performance. Licensed installers follow NFPA and local government regulations to ensure legal compliance and improve fire alarm system effectiveness. Regular fire alarm inspections and maintenance are necessary to keep systems up to code and operational. A system that isn’t working isn’t a system that will provide protection.

Ongoing Maintenance and Monitoring

Regular maintenance includes testing and servicing all parts of the fire alarm system to make sure that they are in working order. Monitoring involves continuous oversight of the system to detect any faults or alarms in real-time. Proper maintenance and monitoring prevent system failures, resulting in prompt response to fire incidents, and maintain compliance with safety regulations.

Mammoth Conclusion

Ready to protect your business with a state-of-the-art fire alarm system? Not sure which one is best for your business?

Contact our friendly team at Mammoth Security for a free consultation today!

We're here to help you find the perfect solution for your fire safety needs.