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Fire Protection Glossary - M


Maintenance. Repair service, including periodic inspections and tests, required to keep the fire alarm system and its component parts in an operative condition at all times, together with replacement of the system or its components when they become undependable or inoperable for any reason.

Manual Fire Alarm Box. A manually operated device used to initiate an alarm signal.

Master Box. A municipal fire alarm box that can also be operated by remote means.

Master Clock. Time indicating appliance, which is designed to provide, synchronized time reporting for secondary clocks.

Master Control Unit (Panel). A control unit that serves the protected premises or portion of the protected premises as a local control unit and accepts inputs from other fire alarm control units.

Mercantile Occupancy. Mercantile occupancies include stores, markets, and other rooms, buildings, or structures for the display and sale of merchandise. Mercantile occupancies include auction rooms, shopping centers, department stores, supermarkets, and drugstores.

Microprocessor. A complex circuit element that is usually the main control for a central processing unit. A single such component may house the entire central processor unit in a fire alarm control unit.

Model Codes. BOCA National Code, ICBO Uniform Building Code, SBCCI Standard Building Code.

MPS (Main Power Supply). The main power supply of a control unit provides all of the necessary power to operate the control unit plus the power required to operate automatic initiating devices and notification appliances and annunciators.

Multiple Station Alarm. A single station alarm capable of being interconnected to one or more additional alarms so that the actuation of one causes the appropriate alarm signal to operate in all interconnected alarms.

Multiple Station Alarm Device. Two or more single station alarm devices that can be interconnected so that actuation of one causes all integral or separate audible alarms to operate. It also can consist of one single station alarm device having connections to other detectors or to a manual fire alarm box.

Multiplexed Initiating Device Loop. A circuit that connects the transponder or digital alarm communicator transmitter (DACT) to a number of initiating device interfaces.

Multiplexing. A signaling method characterized by simultaneous or sequential transmission, or both, and reception of multiple signals on a signaling line circuit, a transmission channel, or a communications channel, including means for positively identifying each signal.

Municipal Communications Center. The building or portion of a building used to house the central operating part of the fire alarm system; usually the place where the necessary testing, switching, receiving, retransmitting, and power supply devices are located.

Municipal Fire Alarm Box (Street Box). An enclosure housing a manually operated transmitter used to send an alarm to the public fire service communications center.

Municipal Fire Alarm System. A system of alarm-initiating devices, receiving equipment, and connecting circuits (other than a public telephone network) used to transmit alarms from street locations to the public fire service communications center.

Municipal Transmitter. A transmitter that can only be tripped remotely that is used to send an alarm to the public fire service communications center.
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by Michael B. Baker. All rights reserved.
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.