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TFM12 QUESTIONS AND ANSWERS
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TFM12 QUESTIONS AND ANSWERS
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TFM12 QUESTIONS AND ANSWERSWhat is used to protect transformers or other devices supplied from power-supply
conductors? - Answer- A. An overcurrent device not rated over 20 Amperes.
What does PLFA stand for? - Answer- Power Limited Fire Alarm
What does NPLFA stand for? - Answer- Non-Power Limited Fire Alarm
What material must NPLFA circuit conductors be made from? - Answer- Solid or
stranded copper
What is a single station detector? - Answer- Battery powered smoke alarms that do not
communicate off premises.
What is a multiple station detector? - Answer- Smoke alarms with battery backup that
are linked together, so that if one unit initiates, all detectors will sound. They do not
communicate off premises.
How frequently must household single and multiple station detectors be inspected and
tested? - Answer- In accordance with the manufacturers recommendations, at least
monthly
How frequently must household fire alarm systems be inspected and tested? - Answer-
At least every year, by a qualified service technician.
What does 'restorable' mean? - Answer- The device can be 'restored' or 'reused' after it
has initiated an alarm.
What size conductors are permitted? - Answer- A. Size 18AWG and 16AWG
When located within 7ft of the floor, how shall cables be fastened? - Answer- Cables
shall be fastened in an approved manner at intervals of not more than 18 inches.
Single conductors shall not be smaller than (X) AWG - Answer- 18
Conductors of 26AWG shall only be permitted in which circumstances? - Answer- A.
Where spliced with a connector listed as suitable for 26 to 24 AWG
What is a Plenum cable? - Answer- Cable that can be installed in ducts and other
spaces used for environmental air.
What is Riser cable? - Answer- Cable to be used in vertical wire runs in shafts or
between floors.
What is General Purpose cable? - Answer- A. Cable for general purpose fire alarm use
, What 'type' shall plenum cable be? - Answer- FPLP
What substitutions are allowed for the above? - Answer- CMP
What 'type' shall riser wire be? - Answer- FPLR
What substitutions are permitted for the above? - Answer- FPLP
What 'type' shall general purpose wire be? - Answer- FPL
What substitutions are permitted for the above? - Answer- CM
What is the maximum voltage permitted through NPLFA cables? - Answer- 600 volts
What is the maximum voltage permitted through multi-conductor NPLFA cables? -
Answer- 150 volts
What is the voltage rating of PLFA cables? - Answer- Not less than 300 volts
Shall the voltage be marked on PLFA cables? - Answer- No
What is a 'Rate Compensation Detector'? - Answer- A device that responds when the
temperature reaches a pre-determined level.
What is a 'Rate of Rise Detector'? - Answer- A device that responds when the
temperature rises at a rate exceeding a pre-determined value
Which sensor is best at detecting 'invisible' smoke particles? - Answer- Ionization
Which sensor is best at detecting thick, 'visible' smoke particles? - Answer-
Photoelectric
What is a 'Spot Type Detector'? - Answer- A device in which the detecting element is
concentrated at a particular location.
What is a 'Digital DACR? - Answer- Digital Alarm Communicator Receiver
Name a DACT. - Answer- Impassa
What is an Alarm Signal? - Answer- A signal indicating an emergency that requires
IMMEDIATE action
Does an exterior horn for a sprinkler system need to be supervised? - Answer- Yes
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