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Fire Protection Glossary - D


Damp Location. See Location, Damp.

Data Gathering Panel (DGP). A remote fire alarm control unit that sends information to a master control unit.

Day-Care Occupancy. Day-care occupancies include all buildings or portions of buildings in which four or more clients receive care, maintenance, and supervision, by other than their relatives or legal guardians, for less than 24 hours per day. Day-care occupancies include; child day-care occupancies; kindergarten classes that are incidental to a child day-care occupancy; adult day-care occupancies, except where part of a health care occupancy; nursery schools; and day-care homes.

Day/Night Sensitivity. A method by which intelligent detectors are forced into high or low sensitivity at certain times of the day.

Delinquency Signal. A signal indicating the need for action in connection with the supervision of guards or system attendants.

Deluge System. A system which releases water in the event of a fire.

Derived Channel. A signaling line circuit that uses the local leg of the public switched network as an active multiplex channel while simultaneously allowing that leg's use for normal telephone communications.

Detector. A device suitable for connection to a circuit having a sensor that responds to a physical stimulus such as heat or smoke.

Detector Coverage. The recommended area that a detector is listed to protect.

Detention and Correction Occupancy. Detention and correctional occupancies are used to house individuals under varied degrees of restraint or security and are occupied by person who are mostly incapable of self-preservation because of security measures not under the occupants'; control. Detention and correctional occupancies include; adult and juvenile substance abuse centers; adult local detection facilities; adult and juvenile work camps; juvenile community residential centers; adult community; residential centers; juvenile detention facilities; adult correctional institutions; and juvenile training schools.

Digital Alarm Communicator Receiver (DACR). A system component that accepts and display signals from digital alarm communicator transmitters (DACTs) sent over the public switched telephone network.

Digital Alarm Communicator System (DACS). A system in which signals are transmitted from a digital alarm communicator transmitter (DACT) located at the protected premises through the public switched telephone network to a digital alarm communicator receiver (DACR).

Digital Alarm Communicator Transmitter (DACT). A system component at the protected premises to which initiating devices or groups of devices are connected. The DACT seizes the connected telephone line, dials a preselected number to connect to a DACR, and transmits signals indicating a status change of the initiating device.

Digital Alarm Radio Receiver (DARR). A system component composed of two subcomponents: one that receives and decodes radio signals, and another that annunciates the decoded data. These two subcompononents can be coresident at the central station or separated by means of a data transmission channel.

Digital Alarm Radio System (DARS). A system in which signals are transmitted from a digital alarm radio transmitter (DART) located at a protected premises through a radio channel to a digital alarm radio receiver (DARR).

Digital Alarm Radio Transmitter (DART). A system component that is connected to or an integral part of, a DACT that is used to provide an alternate radio transmission channel.

Diode Matrix. A circuit of diodes that allows the fire alarm control unit to control outputs by inputs using logic, such as Floor Above, Floor Below, and Fire Floor. A diode matrix is typically found in hard-wired panels, which require such features. In microprocessor-based panels, software programming replaces the diode matrix.

Display. The visual representation of output data as opposed to printed copy.

Door Holder. An electromagnetic device used to hold a door open while energized. In the event of a fire, the door holder is de-energized and the door is allowed to close.

Double Doorway. A single opening that has no intervening wall space or door trim separating the two doors.

Draft Stop. A continuous membrane used to subdivide a concealed space to restrict the passage of smoke, heat, and flames.

Drift Compensation. An algorithm which permits a smoke detector to maintain a constant sensitivity setting by adjusting for environmental contaminants and other factors.

Dry Location. See Location, Dry.

Dual Control. The use of two primary trunk facilities over separate routes or different methods to control one communications channel.

Duct Detector. Initiating devices designed to sample air passing through an HVAC duct and allows for early detection of a developing fire.

Dwelling Unit. A single unit, providing complete, independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking, and sanitation.
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ISSN 1554-074X

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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.