What is an Isolator Module for an SLC Loop?

An Isolator Module automatically isolates wire-to-wire short circuits on a signaling line circuit (SLC) loop. The isolator module also limits the number of modules or detectors that may be rendered inoperative by a short circuit fault on the SLC Loop. If a wire-to-wire short occurs, the isolator module automatically creates and open-circuit (disconnect) the SLC loop. When the short circuit condition is corrected, the isolator module automatically reconnects the isolated section of the SLC loop.

NFPA 72, 2013 Edition, Chapter 23: Protected premises fire alarm systems a requirement was added in paragraph 23.6.1 that limits the maximum number of addressable devices (50) that can be out of service due to a single fault on a pathway. This will require more diligence in system layout and the potential use of isolation modules to limit the number of devices that could be affected by a single fault.

Fire-Lite Alarms offers I300 module (one circuit) and newly rISO-6 Moduleeleased ISO-6 Six Isolator Module (six circuits). The I300 and ISO-6 Fault Isolator Module is used with Fire-Lite’s addressable fire alarm control panels (FACPs) to protect the system against wire-to-wire short circuits on the SLC loop.

Don’t forget, Fire-Lite Alarms is here to help you in your endeavor! Fire-Lite Alarms has 60 years in the business, is the leader in non-proprietary, and has great tools to help you learn about the products. Visit our website to learn more about I300 module and newly released ISO-6 Six Isolator Module.

*In Canada?  You can check out the ISO-6A model!


About the Author
Bill Brosig is a Channel Product Manager for Fire-Lite Alarms, Silent Knight and Honeywell Power with more than 25 years in the Life Safety business and a NICET IV certification. Bill focuses on the customer experience surrounding current offerings and new product applications.




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