Fire Alarm TFM12 Questions and Answers (2022/2023) with Verified Solutions
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Course
Fire Alarm TFM12
Institution
Fire Alarm TFM12
Fire Alarm TFM12 Questions and Answers (2022/2023) with Verified Solutions 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 sing...
Fire Alarm TFM12 Questions and Answers (2022/2023) with Verified Solutions 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 s olid 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 toget her, 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 recomme ndations, 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 permitt ed, 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 t hat 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.
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