Below is a picture of an explosion proof spot-type smoke detector installed in an electrical room in a parking garage.  The detector is installed as per NFPA 72  17.7.3.2.1.   NFPA 72  17.7.3.2.1 – * Spot-type smoke detectors shall be located on… Continue Reading →

NFPA 72 specifies the locations where, when provided, a two-way telephone communications equipment shall be installed.  When provided, the telephone equipment is to be used by the fire service to communicate between an area of a building and a constantly… Continue Reading →

A dedicated function fire alarm system includes an elevator recall control and supervisory control unit; where a smoke control panel would be installed to monitor smoke detection used for elevator recall.  Also, a dedicated function fire alarm system used specifically… Continue Reading →

The support requirements for fire alarm circuit conductors can be found in the National Electrical Code.  The NEC specifies that Power-Limited Fire Alarm cables be supported to building structure using an approved method at intervals not exceeding 18 inches.  Approved… Continue Reading →

Fire alarm relays are used to accomplish a number of functions: anywhere from shutting down an air handling unit, releasing an electrically help door, activating an exhaust fan, or activating elevator recall function.  Because the requirements of monitoring of the… Continue Reading →

The disconnecting means for the fire pump shall be marked as such as well as locked in the on position. During a fire condition, when the sprinkler system is activated, the fire pump shall run until the responding emergency unit,… Continue Reading →

17.16.2.2.2 Dry-Type Sprinkler. (1) A pressure supervisory signal-initiating device for a dry- pipe sprinkler system shall indicate both high- and low- pressure conditions. (2) The off-normal signal shall be initiated when the pressure increases or decreases by 10 psi (70… Continue Reading →

Stair Pressurization is provided to allow building occupants to safely evacuate a building using the stair cases. Fans are provided to supply air into the staircase upon activation of an associated alarm condition. The idea is to pressurize the stairs… Continue Reading →

21.3.5* A lobby smoke detector shall be located on the ceiling within 21 It (6.4 m) of the centerline of each elevator door within the elevator bank under control of the detector. 21.3.3 Unless otherwise required by the authority having… Continue Reading →

  10.15* Protection of Fire Alarm System. In areas that are not continuously occupied, automatic smoke detection shall be provided at the location of each fire alarm control unit(s), notification appliance circuit power extenders, and supervis- ing station transmitting equipment… Continue Reading →