TFM 12 Fire Alarm Technical questions
with verified answers
Does a fire hood system and a kitchen need to be monitored by the fire alarm system? - **
VERIFIED ANSWERS **✔✔Yes
What does PLFA stand for? - ** VERIFIED ANSWERS **✔✔Power Limited Fire Alarm
What does NPLFA stand for? - ** VERIFIED ANSWERS **✔✔Non-Power Limited Fire Alarm
What is the difference between PFLA and NPFLA? - ** VERIFIED ANSWERS **✔✔an NPLFA
can operate at up to 600v, and the power output isn't limited
a PLFA has the voltage and power limited by a listed power source.
What material must NPFLA circuit conductors be made from? - ** VERIFIED ANSWERS
**✔✔only solid and/or stranded copper is permitted.
What does AWG stand for? - ** VERIFIED ANSWERS **✔✔American Wire Gauge
What size conductors are permitted? - ** VERIFIED ANSWERS **✔✔If used on a NPLFA
system, then 18 AWG or larger shall be permitted, provided they meet certain ampacities and are
installed in an approved method. (See NFPA 70 Article 760.49)
If used on a PLFA system, then 26 AWG if multi-conductor cable or 18 AWG if single conductor.
What is used to protect transformers or other devices supplied from power-supply conductors? - **
VERIFIED ANSWERS **✔✔An over-current device not rated over 20 amperes for a PLFA
system. For a NPLFA system, it is 7 amps if using 18 AWG wire, 10 amps if using 16 AWG wire, and
for 14 AWG or larger, refer to article 315 in the NFPA 70.
, When located within 7 feet of the floor, how shall cables be fastened? - ** VERIFIED ANSWERS
**✔✔Cables shall be fastened in an approved manner at intervals of not more than 18 inches.
Single conductors shall not be smaller than ___ AWG? - ** VERIFIED ANSWERS **✔✔18
Conductors of 26 AWG shall only be permitted in which circumstance? - ** VERIFIED
ANSWERS **✔✔When used in a multi-conductor cable.
How shall PFLA conductors NOT be installed? - ** VERIFIED ANSWERS **✔✔PFLA
conductors shall not be strapped, taped, or attached to the exterior of any conduit or raceway.
What is Plenum cable? - ** VERIFIED ANSWERS **✔✔Cable that can be installed in ducts,
plenums, or other spaces used for environmental air, and shall also be listed as having adequate fire-
resistant and low smoke-producing characteristics.
What is a Riser cable? - ** VERIFIED ANSWERS **✔✔Cable to be used in vertical wire runs in
shafts between floors. Not to be used where Plenum cable is required.
It is capable of preventing fire from rising from floor to floor.
What is general purpose cable? - ** VERIFIED ANSWERS **✔✔Cable for general purpose fire
alarm use. Not to be used where plenum cable or riser cable is required.
It is resistant to the spread of fire.
Why 'type' shall plenum cable be? What substitutions are allowed? - ** VERIFIED ANSWERS
**✔✔FPLP; CMP can be substituted.
Why 'type' shall riser cable be? What substitutions are allowed? - ** VERIFIED ANSWERS
**✔✔FPLR; CMR, FPLP, and CMP can be substituted.
with verified answers
Does a fire hood system and a kitchen need to be monitored by the fire alarm system? - **
VERIFIED ANSWERS **✔✔Yes
What does PLFA stand for? - ** VERIFIED ANSWERS **✔✔Power Limited Fire Alarm
What does NPLFA stand for? - ** VERIFIED ANSWERS **✔✔Non-Power Limited Fire Alarm
What is the difference between PFLA and NPFLA? - ** VERIFIED ANSWERS **✔✔an NPLFA
can operate at up to 600v, and the power output isn't limited
a PLFA has the voltage and power limited by a listed power source.
What material must NPFLA circuit conductors be made from? - ** VERIFIED ANSWERS
**✔✔only solid and/or stranded copper is permitted.
What does AWG stand for? - ** VERIFIED ANSWERS **✔✔American Wire Gauge
What size conductors are permitted? - ** VERIFIED ANSWERS **✔✔If used on a NPLFA
system, then 18 AWG or larger shall be permitted, provided they meet certain ampacities and are
installed in an approved method. (See NFPA 70 Article 760.49)
If used on a PLFA system, then 26 AWG if multi-conductor cable or 18 AWG if single conductor.
What is used to protect transformers or other devices supplied from power-supply conductors? - **
VERIFIED ANSWERS **✔✔An over-current device not rated over 20 amperes for a PLFA
system. For a NPLFA system, it is 7 amps if using 18 AWG wire, 10 amps if using 16 AWG wire, and
for 14 AWG or larger, refer to article 315 in the NFPA 70.
, When located within 7 feet of the floor, how shall cables be fastened? - ** VERIFIED ANSWERS
**✔✔Cables shall be fastened in an approved manner at intervals of not more than 18 inches.
Single conductors shall not be smaller than ___ AWG? - ** VERIFIED ANSWERS **✔✔18
Conductors of 26 AWG shall only be permitted in which circumstance? - ** VERIFIED
ANSWERS **✔✔When used in a multi-conductor cable.
How shall PFLA conductors NOT be installed? - ** VERIFIED ANSWERS **✔✔PFLA
conductors shall not be strapped, taped, or attached to the exterior of any conduit or raceway.
What is Plenum cable? - ** VERIFIED ANSWERS **✔✔Cable that can be installed in ducts,
plenums, or other spaces used for environmental air, and shall also be listed as having adequate fire-
resistant and low smoke-producing characteristics.
What is a Riser cable? - ** VERIFIED ANSWERS **✔✔Cable to be used in vertical wire runs in
shafts between floors. Not to be used where Plenum cable is required.
It is capable of preventing fire from rising from floor to floor.
What is general purpose cable? - ** VERIFIED ANSWERS **✔✔Cable for general purpose fire
alarm use. Not to be used where plenum cable or riser cable is required.
It is resistant to the spread of fire.
Why 'type' shall plenum cable be? What substitutions are allowed? - ** VERIFIED ANSWERS
**✔✔FPLP; CMP can be substituted.
Why 'type' shall riser cable be? What substitutions are allowed? - ** VERIFIED ANSWERS
**✔✔FPLR; CMR, FPLP, and CMP can be substituted.
