How To Connect Fire Alarms to a Home Security System

Image of fire alarm system

Connecting a fire alarm to your home security system will be beneficial to you and your family. Most security systems are connected to a remote monitoring service. Therefore, if you wire your fire alarm to your security system, a triggered fire alarm will also send a signal to the remote monitoring service. Connecting the two is not too difficult. Read on below for instructions to connect a fire alarm to your home security system.

Check alarm panel. Ensure that your security system has an alarm panel accessible to you.

Check wiring. Check your wiring and installation to ensure that they conform to local building codes.

Gather materials. Prepare the following materials:

  • smoke detectors (2-wire)
  • wiring (2- or 4-conductor)
  • resistor (1 4.7K 1/8W)
  • Wire cutters
  • Screwdriver

Decide where you will mount your smoke detectors. Smoke detectors are usually mounted in the ceiling. Arrange them efficiently inside your home to cover as much area as possible. Avoid installing them in your bathroom as steam from the shower may accidentally trigger it. Do not mount them yet.

Connecting. Lay out the 2 or 4 conductor wiring from the security alarm panel to the location of the nearest smoke detector. From that smoke detector, continue laying out the 2 or 4 conductor wiring to the next smoke detector. Do the same until you have connected all the smoke detectors you have placed. Connect the smoke detectors that are closest to one another. When all smoke detectors have been connected to each other, a chain should be formed, starting from the alarm panel of your home security system, ending at the farthest smoke detector.

Ensure that there is at least 12 inches of slack at each connected smoke detector. Do not attach the wiring to the alarm panel nor to the smoke detectors, yet.

Cut the conductor wiring at each smoke detector. Ensure that there is at least 6 inches of slack, so you can work comfortably.

Remove the covering from the bundle. Take the ends of the red and black wires and remove about 1/4-inch of insulation. If you are working with 4-conductor wiring you need not cut the green and yellow wires. 

Connect the wires with the smoke detector's screw terminals. Use the red wire to with the negative (--) terminal and use the black wires with the positive (+) terminals. Four terminals should be available for each smoke detector. This will allow you to connect the previous smoke detector to the one after it.

When you reach the farthest and last smoke detector, attach the last red conductor wire to the negative (--) terminal and the black to the positive (+) terminal. You are then left with one negative and one positive terminal open. Secure these open terminals with the 4.7K 1/8W resistor.  

Mount the smoke detectors. Depending on what housing your smoke detector comes with, most can be assembled and mounted using screws and a screwdriver.

Connect the conductor wiring to the alarm panel. Use the black wiring with negative (--) SMK panel and the red wiring with the positive (+) SMK panel.

Activation code. Enter the activation code in the alarm panel that corresponds to the circuit where the smoke detectors are connected. 

Type in your code. Type in the activation code on the alarm panel corresponding to the circuit attached to the smoke alarms. There is no need to set the time to activate the smoke alarms. Unlike the home security system, the smoke alarms should function 24 hours a day.

These are the simple steps on how to connect a fire alarm to your home security system. Just be reminded about building codes on wiring so you won’t get into trouble.


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