Glossary - B
Glossary - C
Glossary - D
Glossary - E
Glossary - F
Glossary - G
Glossary - H
Glossary - I-J-K
Glossary - L
Glossary - M
Glossary - N
Glossary - O
Glossary - P-Q
Glossary - R
Glossary - S
Glossary - T
Glossary - U
Glossary - V
Glossary - W-X-Y-Z

  Log In


Fire Protection Glossary - T


Time Control Module (TCM). Used with a fire alarm control unit to provide releasing service and pre-signal evacuation.

Tamper Supervisory Device. A device used to monitor the position of a water valve, which isolates a waterflow or water pressure switch.

Thermal Lag. See Rate Compensation Detector.

Transmission Channel. A circuit or path connecting transmitters to supervising station or subsidiary stations on which signals are carried.

Transmitter. A system component that provides an interface between signaling line circuits, initiating device circuits, or control units and the transmission channel.

Transponder. A multiplex alarm transmission system functional assembly located at the protected premises.

Trouble Signal. A signal initiated by the fire alarm system or device indicative of a fault in a monitored circuit or component.

Trunk Facility. That part of a signaling line circuit connecting two or more leg facilities to the central station supervising station or satellite station.

Trunk Primary Facility. That part of a transmission channel connecting all leg facilities to a central or proprietary supervising station or subsidiary station.

Trunk Secondary Facility. That part of a transmission channel connecting tow or more, but less than all, leg facilities to a primary trunk facility.

Two-Way Fire Department Communications System. An electrically supervised telephone system providing private voice communication capability between the command center or central control panel and designated remote locations.
Send a link to a friend        


Home - Clients - Book Store - NICET Level I - NICET Level II - NICET Level III - NICET Level IV - Glossary - External Links - Licensing - Photographs - Employment - Disney Crud(SM) - Archives 2001 - Archives 2002 - Archives 2003 - Archives 2004 - Archives 2005 - Archives 2006 - Archives 2007 - Archives 2008 - Archives 2009 - Archives 2010 - Archives 2011 - Archives 2012 - Archives 2013 - Misc

ET NewsSM content copyright © 2020
by Michael B. Baker. All rights reserved.
ISSN 1554-074X

RSS Content
Some information may be found within this web site that is reprinted with permission from one or more of the following: NFPA 70 National Electrical Code®,NFPA 72® National Fire Alarm Code®, & NFPA 101® Life Safety Code®, Copyright© NFPA, Quincy, MA 02269.

This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented only by the standard in its entirety.