Basic Fire Alarm Systems


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Basic Fire Alarm Systems

  1. 1. Basic Fire Alarm Systems I Introduction to Office Buildings (B or S-1 Occupancy) Fire Sprinkler Alarm Monitoring Systems
  2. 2. Sample B Occupancy Building
  3. 3. Basic Waterflow Systems <ul><li>What is to be monitored? </li></ul><ul><li>Fire sprinkler riser with flow switch and tamper and/or PIV? </li></ul><ul><li>A main office or lobby? </li></ul><ul><li>Duct smoke detectors? </li></ul><ul><li>What is required? </li></ul><ul><li>Basic connections to each of these devices must be provided. </li></ul><ul><li>A horn strobe, manual pull station and an annunciator/keypad. </li></ul><ul><li>Any HVAC unit exceeding 2000cfm requires a duct smoke detector and a connection to it. </li></ul>
  4. 4. Special Circumstances <ul><li>Be sure to look at the mechanical plans of a B occupancy (office building). Check and see if it has a 1-Hour rated corridor. It is usually labeled as such. However when this occurs, fire/smoke dampers (FSD) will more than likely will be present. These may require additional smoke detectors (if there are no duct detectors), relay modules and a few extra connections. </li></ul><ul><li>If an office is two or more floors, it will certainly have an elevator/s. Each elevator will require relays, a smoke detector per lobby, a smoke and heat detector in the equipment room as well as the top of the shaft (unless a retrofit). </li></ul><ul><li>Any building that is three floors or more may be subject to additional requirements such as smoke control, atriums and additional notification. </li></ul><ul><li>Also, some AHJ’s and insurance companies require more than what is required by code. Insurance companies are usually the parties who require extra devices. </li></ul>
  5. 5. High-Rise Buildings <ul><li>Any building that has seven floors or is over 75 ft. in height is considered a high-rise. These building have their own set of requirements. </li></ul><ul><li>Full voice evacuation is they key in this situation. Though strobes are okay to use, horn strobes are now replaced by speaker strobes. </li></ul><ul><li>All common areas (open office areas, corridors, conference rooms, restrooms, break rooms and lobbies) are to receive full smoke detection and notification devices. </li></ul><ul><li>At each stairwell and elevator lobby on every floor, there is to be a manual pull station and a firefighters phone. If the pull stations are more than 150 ft. apart, and additional pull will be required so that the travel distance is less than 150 ft. </li></ul><ul><li>If a high-rise has subterranean parking levels, they are subject to full voice notification also. </li></ul><ul><li>High-rises are very particular and should be carefully bid between the salesperson, operations and engineering. </li></ul>
  6. 6. In Review <ul><li>B and S-1 occupancies are usually very simple systems that can quickly become quite complicated. </li></ul><ul><li>Mechanical drawings are an exceptionally important part of any bid. </li></ul><ul><li>Know if the customer has any plan of expanding, this may cost them a little more upfront, but eliminates a lot of hassle down the road. </li></ul><ul><li>Elevators usually require automatic recall from the fire alarm system. Those functions are primary and secondary floor recall and shunt trip. </li></ul>