HomeMy WebLinkAboutA11-0033 2-4 wire Smoke detector Sys. Sen. Tech Field Bulletin �� SYSTEM
Technical Fie/d Bul►etin �...� SF/USOR
Issued: 8/98 Revised: l/04
To: Users of System Sensor smoke detec[ors
From: Sys[ems Application Engineers
Subject: Smoke de�ec[ors — 2- or 4-wire wmpatibility?
Underwriters Laboratories (UL) reyuires dia[ smoke detecrors be compatible when used with a lis[ed fire alann control panel (FACP).
This compa[ibility of smoke detectors with control panels is only an issue where 2-wire smoke de[ectors (power and signaling line �
circuit (SLC) on the same [wo condactors) are concemed. This is due to the iequ'uementa, res[rictions, and limita[ions of elec[rical �
cusen[ needed to cause the de[ectors to alazm and for [he control panel [o "see" that alarm. Detectors are not required ro be listed
when they draw [heir power for operation from source other than the SLC. The National Fire Alam� Code, NFPA 72, 2002 edition,
states in chap[er 4:
4.4.2 Compatibility.
All fire detection devices that receive their power from the initiating device circuit or signaling line circuit of a fire alarm
controt unit shall be listed Por use with the control unit.
Because of this, UL requirements do not include 4-wire smoke detectors or any notification devices. Notification devices must
verify that the power and signal being supplied through the notification connections are sufficien[ for operation. Some
notificntion devices require either coded or non-coded signals fur proper operation. The FACP manual should be consulted for
specifications.
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If you have any questions conceming Sys[em Sensor products or their npplication,
please contact Technical Services a[ 1-800-SENSOR2 (736-7672). ex[ension 2.
3R25 Ohio Avenue • St. Charles. IL 60174 • Phone: A00-736-7672 • Fax: 630377-6583 • www.systemsensor.com