NFPA 72 Questions and Answers with Certified Solutions

NFPA 72 Questions and Answers with Certified Solutions What does PFLA stand for? Power Limited Fire Alarm. What does NPFLA stand for? Non-Power Limited Fire Alarm. What material must NPFLA 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 station detectors be inspected and tested? In accordance with the manufacturers recommendations, at least monthly. How frequently must household fire alarm systems be inspected and tested? At least every 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 though 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 an alarm. What does "non-restorable" mean? The detector cannot be "reused" after it has initiated an alarm. (Think of a heat detector, which self-destructs upon initiating.) What size conductors are permitted? Size 18 A.W.G and 16 A.W.G 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 over-current device not rated over 20 Amperes. When located within 7 feet 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 than ___ A.W.G? 18. Conductors of 26 A.W.G shall only be permitted in which circumstances? Where spliced with a connector listed as suitable for 26 to 24 A.W.G. How should PFLA conductors NOT be installed? PFLA conductors shall not be strapped, taped or attached to the exterior of any conduit or raceway. What is a Plenum cable? What are its characteristics? Cable that can be installed in ducts, plenums or other spaces used for environmental 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