TFM 12 Exam Study Guide

TFM 12 Exam Study Guide 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? - Solid or stranded copper 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. What does 'restorable' mean? - The detector can be 'restored' or 'reused' after it has initiated an alarm. What size conductors are permitted? - Size 18AWG and 16AWG 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 than __________ 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 What is a Plenum cable? - Cable that can be installed in ducts and other spaces used for environmental air. What is Riser cable? - Cable to be used in vertical wire runs in shafts or between floors. What is General Purpose cable? - Cable for general purpose fire alarm use What 'type' shall plenum cable be? What substitutions are allowed? - FPLP What 'type' shall riser wire be? What substitutions are permitted? - FPLR What 'type' shall general purpose wire be? What substitutions are permitted? - FPL 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 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