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TFM 12 Fire Alarm Technical Questions and Answers with
100% Complete Solutions
Does a fire hood system and a kitchen need to be monitored by
the fire alarm system? - ANSWER Yes
What does P.L.F.A stand for? - ANSWER Power Limited Fire
Alarm
What does N.P.L.F.A stand for? - ANSWER Non-Power Limited
Fire Alarm
What is the difference between P.F.L.A and N.P.F.L.A? - ANSWER
an N.P.L.F.A can operate at up to 600v, and the power output
isn't limited
a P.L.F.A has the voltage and power limited by a listed power
source.
What material must N.P.F.L.A circuit conductors be made from?
- ANSWER ONLY solid stranded copper is permitted.
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What does A.W.G stand for? - ANSWER American Wire Gauge
What size conductors are permitted? - ANSWER Size 18 A.W.G
and 16 A.W.G are permitted, provided they do not exceed
certain capacities.
What is used to protect transformers or other devices supplied
from power-supply conductors? - ANSWER An over-current
device not rated over 20 amperes.
When located within 7 feet 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 ___ A.W.G? -
ANSWER 18
Conductors of 28 A.W.G shall only be permitted in which
circumstance? - ANSWER Spliced with a connector listed as
suitable for 26 to 24 A.W.G
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How shall P.F.L.A conductors NOT be installed? - ANSWER P.F.L.A
conductors shall not be strapped, taped, or attached to the
exterior of any conduit or raceway.
What is Plenum cable? - ANSWER Cable that can be installed in
ducts, plenums, or other spaces used for environmental air.
What is a Riser cable? - ANSWER 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? - ANSWER 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.
TFM 12 Fire Alarm Technical Questions and Answers with
100% Complete Solutions
Does a fire hood system and a kitchen need to be monitored by
the fire alarm system? - ANSWER Yes
What does P.L.F.A stand for? - ANSWER Power Limited Fire
Alarm
What does N.P.L.F.A stand for? - ANSWER Non-Power Limited
Fire Alarm
What is the difference between P.F.L.A and N.P.F.L.A? - ANSWER
an N.P.L.F.A can operate at up to 600v, and the power output
isn't limited
a P.L.F.A has the voltage and power limited by a listed power
source.
What material must N.P.F.L.A circuit conductors be made from?
- ANSWER ONLY solid stranded copper is permitted.
,2|Page
What does A.W.G stand for? - ANSWER American Wire Gauge
What size conductors are permitted? - ANSWER Size 18 A.W.G
and 16 A.W.G are permitted, provided they do not exceed
certain capacities.
What is used to protect transformers or other devices supplied
from power-supply conductors? - ANSWER An over-current
device not rated over 20 amperes.
When located within 7 feet 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 ___ A.W.G? -
ANSWER 18
Conductors of 28 A.W.G shall only be permitted in which
circumstance? - ANSWER Spliced with a connector listed as
suitable for 26 to 24 A.W.G
, 3|Page
How shall P.F.L.A conductors NOT be installed? - ANSWER P.F.L.A
conductors shall not be strapped, taped, or attached to the
exterior of any conduit or raceway.
What is Plenum cable? - ANSWER Cable that can be installed in
ducts, plenums, or other spaces used for environmental air.
What is a Riser cable? - ANSWER 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? - ANSWER 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.
