Fire Alarm TFM12 Question with correct Answers 2023

Fire Alarm TFM12 Question with correct Answers 2023 What does PLFA stand for? Power Limited Fire Alarm What does NPLFA stand for? Non Power Limited Fire Alarm What material must NPLFA circuit conductors be made from Only solid or stranded copper is permitted What is a single station detector? Battery powered smoke detectors that do not communicate off premises. What is a multiple station detector? Mains powered smoke detectors with battery backup that are linked together, so that if one unit initiates, alarms in all detectors will sound. They do not communicate off premises. How frequently must household single and multiple single station detectors be inspected and tested? In accordance with the manufactures recommendations, at least monthly. How frequently must household single and multiple station detectors be inspected and tested? At least 3 years, by a qualified service technician. How frequently must heat detectors be tested? Two or more annually, different detectors must be tested each year, and within 5 years all detectors must have been tested. What does "restorable" mean? The detector can be "restored" or "reused" after it has initiated. What does "non-restorable" mean? The detector cannot be 're-used" after it has initiated an alarm. (Think of a heat detector, which self destructs upon initiating.) What size conductors are permitted? Size 18 AWG and 16 AWG are permitted, provided they do not exceed certain rated ampacities What is used to protect transformers or other devices supplied from power-supply conductors? An overcurrent device not rated over 20 Amperes When located within 7ft of the floor, how shall cables be fastened? Cables shall be fastened in an approved manner at intervals of not more than 18 inches. Single conductors shall not be smaller that ___ AWG? 18 Conductors of 26AWG shall only be permitted in which circumstances? Where spliced with a connector listed as suitable for 26 to 24 AWG. How should PLFA conductors NOT be installed? PLFA conductors shall not be strapped, taped or attached to the exterior of any conduit or raceway. What is Plenum cable? What are its characteristics? Cable that can be installed in ducts, plenums or other spaces used for environment air. It has adequate fire resistance and low smoke-producing characteristics. What is riser cable? What are its characteristics? Cable to be used in vertical wire runs in shafts or between floors. Not to be used where Plenum cable is required. It is capable of preventing fire from rising form floor-to-floor. What is Genral Purpose Cable? What are its characteristics? Cable for general purpose fire alarm use. Not to be used where Plenum or Riser cable is required. It is resistant to the spread of fire. What type shall plenum cable be? What substitutions are allowed? Power Limited Fire Alarm Plenum (FPLP) CMP can be substituted. What type shall riser wire be? What substitutions are permitted? Power Limited Fire Alarm Riser (FPLR) CMP,FPLP,CMR can be substituted. What type shall general purpose wire be? What substitutions are permitted? Power Limited Fire Alarm (FPL) CMP,FPLP,CMR,FPLR,CMG, and CM can be substituted. (All types) What is the maximum voltage permitted through multi-conductor NPLFA cables? 150 volts What is the voltage rating of PLFA cables? Not less than 300 volts Shall the voltage be marked on PLFA cables? No, because they may be misinterpreted and used for electrical applications. What is a "Rate Compensation Detector"? A device that responds when the temperature reaches a pre-determined level. What is a "Rate of Rise Detector" A device that responds when the temperature rises at a rate exceeding a pre-determined value. What is a Smoke Detector? A device that detects both visible and invisible combustion particles. Which sensor is best at detecting invisible smoke particles? Ionization Which sensor is best at detecting thick, visible smoke particles? Photoelectric What is a Spot Type Detector? A device in which the detecting element is concentrated at particular location. What is a Digital Alarm Communicator Receiver? (DACR) a system component that accepts and displays signals sent over the public phone network from a DACT. (Le. ADT Monitoring center) What is a Digital Alarm Transmitter? (DACT) A system component at the protected premises is connected to the detection devices. It has line seizure and can connect to a DACR. (le. DSC Impassa) What is an Alarm Signal? A signal indicating an emergency that requires immediate action. What is a supervisory signal? A signal that indicates the need for action in connection with the SUPERVISION of the fire equipment. What is a trouble signal? A signal that indicates a FAULT with the fire equipment. It must have an audible signal, distinctive form alarm signals. Does an exterior horn for a sprinkler system need to be supervised? Yes Does a fire hood sprinkler system in a kitchen need to be monitored by the fire alarm system? Yes What is a cloud chamber smoke detection? A detector that draws an air sample into high-humidity, low pressure chamber. The condition in the chamber cause the moisture in the air to condense on the smoke particles, forming a cloud. The density of this cloud is measured by a photoelectric principle, if it meets a certain criteria, an alarm is generated. What is a ionization smoke detector? A detector that uses a small amount of radioactive material to ionize the air between two differently charge electrodes. When smoke is present between these electrodes, it causes the conductance of the air to decrease, and this causes the alarm to trip. What is a photoelectric light scattering smoke detection? A detector that uses light source and a photosensitive sensor, arranged so that light will only fall on the sensor when smoke particles are present. The particles reflect and retract light towards the sensor tripping the alarm. What is important about the way trouble signals sound? They must be distinctive from alarm signals. What three procedures must be in place before it is permitted to install a means to silence trouble/supervisory/alarm signals? 1. The means shall be key operated and contained within the locked enclosure. 2. The means shall transfer its audible warning visual warning. 3. The audible trouble signal shall sound when the system is set to this silent mode and no trouble or supervisory exists. Fire/Supervisory signals shall be __ in sound from other signals and shall not be used for any other purpose. Distinctive What code shall all wiring, cable and equipment be in accordance with? NFPA 70 and the national electrical code. Specifically articles 760, 770 and 800 All systems shall test free of ___, except for applications which ___ are approved Grounds, Grounds So long as single open, ground or short circuit conditions do not affect the operation of equipment, what is not needed? Monitoring for integrity. Such conditions must not prevent alarm, trouble or supervisory signals being sent. If speakers are used to generate audible fire signals, what rule must apply? The speaker must be monitored for integrity. Any failure should result in a trouble signal. In one or two family dwelling, where must smoke detectors be located? All sleeping rooms, outside of each sleeping area and on all levels of the dwelling, (including basements)