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Fire Alarm TFM12 Exam Questions with Answers
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Fire Alarm TFM12 Exam Questions withAnswers
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.
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