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Electrical Wire and Cable


Fire Alarm System Wiring

Installing a fire alarm system requires careful planning and these correct components.


Considerations for Fire Alarm System Wiring

Question: I need to wire a horn and strobe for an alarm in a facility. The owner wants to be able to silence the fire alarm horn with a momentary switch, but still have the fire strobe light active until the fire alarm condition goes OFF. After it goes OFF and back ON the horn and strobe should be active until the horn is silenced or the alarm goes back OFF.

This electrical question came from: Bobby, from Grenville, South Carolina

See more about Home Wiring for South Carolina

Dave’s Reply:
Thanks for your electrical question Bobby
Wiring a Facility Fire Alarm System
Bobby, I have installed fire alarm cables and wiring for several fire alarm systems which are carefully designed, monitored and controlled by an approved fire alarm panel. These panels have all the capabilities that you are describing with optional features for extensive alarm supervision and annunciation.  All fire alarm systems should be installed by authorized licensed contractors who are fully covered by liability insurance and all work must be inspected. The fire alarm systems must be routinely tested and documented for insurance compliance and reliability to ensure system functionality.

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Guide to Home Electrical Wire


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Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handywomen, and Electricians
Includes:
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.





Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

Electrical Tips to Help You Wire it Right

The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.

« How to Safely Use Light Fixtures From Other Countries Replacing Three Way Switches »

FAQs Frequently Asked Questions and Comments

3 Responses to “Fire Alarm System Wiring”
  1. Mohamed Ahmed says:

    Can we connect a bell to the same circuit where detectors and call points are connected in conventional systems.

    Thanks,
    Mohamed

  2. Teresa says:

    I have been working with fire alarm wires for years, recently a supervisor stated I could only put three wires in any one hole otherwise we would have to de-rate the wire. I have never heard of fire alarm wire; 16/2 and 16/4, needing to be de-rated. If it does why wouldn’t the local fire marshal pass any building where there is more then three in one hole? I am working on a multi-family project, PLEASE HELP. Thank You

    • Dave Rongey says:

      Hi Teresa,
      From the size of the wiring you have described, the fire alarm system you are referring to is most likely a low voltage system. Most fire alarm systems are specifically engineered for the type of system that will be installed, including the cabling, the smoke detector heads or devices, alarm panel, or annunciation system. Please refer to the instruction manual and engineering notes for specific information and wiring methods. If you find that your supervisors comments do not comply with the instructions and methods as described then you may want to inquire as to the justification and basis for the new wiring methods which they are suggesting.
      I hope this helps,
      Dave

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