Explaining The Mechanism of a Fire Alarm System

Fire alarm systems are commodities designed to prevent the escalation of fire and help occupants of the premises. Fire alarm systems are preventative gears that detect smoke, heat, the presence of carbon monoxide and things that could lead to a fire.  

Installing a fire alarm system is essential for building safety. Investing must come with a bit of research. For example, the parts that make up a fire alarm system, how it works and other basic details on the subject. 

So, we’ve taken it upon ourselves to impart what we know on the subject. Keep reading to gain helpful insights. A well-informed decision is not probable without research. So, why the wait? Learn about the fire alarm system basics in the middle of your late-night doomscroll.  

Fire Alarm Design 

Fire Alarm Design is the state’s standards and regulations involved in the making of the equipment. So, when you are in California, you must adhere to the guidelines of NFPA 72. In addition, a fire alarm system must also be compliant with the Division of The State Architect (DSA) and the California Fire Code (CFC).  

According to the CFC, sprinkler systems must be installed in allocated “Access Rooms”. Such rooms must be marked with a label for easy access during situations of urgency. These rooms must be lit, at all times.  

Other guidelines by the CFC and NFPA 72 include:  

• Fire alarm detectors must be installed in hallways and bedrooms.  

• Any building that has installed a fire alarm must have a Fire Alarm Control Panel. 

• There must be smoke alarms in sleeping spaces.  

• In cases of multiple fire alarms, only integrated testing is allowed in cases of regular fire alarm system maintenance and repairs.  

Parts of A Fire Alarm System 

A fire alarm consists of 4 different components. These are:  

1. Power Supply Outlets: Supplies power to the fire alarm circuit via 2- or 4- wired pathways.  

2. Fire Alarm Control Panel (FACP): The panel that connects all devices and alarms to one control module. This helps manage all devices from one point of control and sends alarms to all corners of a building at the same time.  

3. Initiating Devices: These include smoke/heat sensors. Devices that help detect a fire and send alerts to the FACP.  

4. Notification Devices: Upon receiving alerts from sensors, the FACP, in turn, sends alerts to all notification devices (horns, speakers, etc) to help speed up evacuation.  

How Does a Fire Alarm Work? 

As discussed, the 4 basic fire alarm components make the process of fire detection seamless. Moreover, upon detection – the fire alarm system aims to send alerts to pace up evacuation. So, how does this stream of operations flow? Here’s how: 

• Firstly, an initiating device detects a sign of fire – be it heat or smoke, from a specific location. 

• Since the FACP monitors all initiating and notification devices – it locates the device that’s sending off the alarm. Thus, detecting the zone of danger.  

• This differs a little in addressable alarm systems. Conventional fire alarm systems can only detect the zone of danger. However, addressable fire alarm systems can detect the exact device – thus, making the process far more accurate.  

• Upon detecting the zone of danger, the FACP turns on the notification devices.  

• These send alerts to building occupants for immediate evacuation.  

• Finally, the (not all) FACP calls the monitoring company for intervention in the matter.  

• Some fire alarm systems are connected to fire suppression systems like sprinkler systems. These may be activated upon the notification devices’ alerts.  

That’s how a fire alarm system works. With a few changes here and there, fire alarm systems operate in this simple mechanism.  

How to Disable a Fire Alarm?

Very important for false alarms or when some of the fire alarm system’s components have been compromised. So, here’s how you disable a fire alarm:  

• Find the silence buttons next to the Trouble and Alarm buttons.  

• Use these to disable the alarm.  

• If the fire alarm keeps beeping, contact a fire alarm expert to troubleshoot the issue.  

Read More:

Different Types of Fire Alarm Systems and Their Detectors

7 Reasons to Install a Commercial Fire Alarm System

3 States of Fire Alarm Systems 

All fire alarm control panels have three modes of function. Indicating the current condition of the fire alarm system. These three states are Normal, Alarm, and Trouble.  

Normal: When all fire alarm system components are working correctly and there’s no alarm being activated for smoke/heat detection. In this state, none of the notification devices or the initiating devices are activated.  

Alarm: In this mode, the initiating device is activated upon smoke/heat detection. The device then sends alarms to the FACP, which, in turn, activates the notification devices. 

Trouble: A fire alarm system is on Trouble Mode when there’s some anomaly detected in the system. There can be an issue with the wiring, the circuit, or a single notification device. In this case, the panel shows warning text of Trouble. In this case, you need to get in touch with fire alarm operators. 

These are the three basic modes of a Fire Alarm System. Some advanced systems have more modes, based on the variety of operations. 

The Final Word

With the fire alarm system basics out of the way, you must understand the concept better than you did 8 minutes back. From what makes a fire alarm to how it works – we’ve gone over all the themes that you will find beneficial.  

When you go to the fire alarm store or need a fire alarm repair, you won’t be as clueless. You’ll know exactly what to do and which alarms to look at. But if you still feel lost in such situations, don’t sweat. We’re happy to help clear any doubts in the air, just get in touch!