NFPA72Exam2025Questionsand
Answers with complete solution
WhatdoesPFLAstandfor?Ans-PowerLimitedFireAlarm.
WhatdoesNPFLAstandfor?Ans-Non-PowerLimitedFireAlarm.
WhatmaterialmustNPFLAcircuitconductorsbemadefrom?Ans-Onlysolidorstranded
copper is permitted.
Whatisasinglestationdetector?Ans-
Batterypoweredsmokedetectorsthatdonotcommunicate off premises.
Whatisamultiplestationdetector?Ans-Mainspoweredsmokedetectorswithbatterybackup
that are linked together, so that if one unit initiates, alarms in all detectors willsound.
They do not communicate off premises.
Howfrequentlymusthouseholdsingleandmultiplestationdetectorsbeinspectedandtested
?Ans- In accordance with the manufacturers recommendations, at leastmonthly.
Howfrequentlymusthouseholdfirealarmsystemsbeinspectedandtested?Ans-Atleast every
3 years, by a qualified service technician.
How frequently must heat detectors be tested?Ans- Two or more annually
differentdetectorsmustbetestedeachyearthoughandwithin5yearsalldetectorsmusthavebe
en tested.
Whatdoes"restorable"mean?Ans-Thedetectorcanbe"restored"or"reused"afterithas
initiated an alarm.
Whatdoes"non-restorable"mean?Ans-Thedetectorcannotbe"reused"afterithasinitiated an
alarm. (Think of a heat detector, which self-destructs upon initiating.)
Whatsizeconductorsarepermitted?Ans-Size18A.W.Gand16A.W.Garepermitted,
provided they do not exceed certain rated ampacities.
Whatisusedtoprotecttransformersorotherdevicessuppliedfrompower-
supplyconductors?Ans- An over-current device not rated over 20 Amperes.
Whenlocatedwithin7feetofthefloor,howshallcablesbefastened?Ans-Cablesshall be
fastened in an approved manner at intervals of not more than 18 inches.
, Singleconductorsshallnotbesmaller than A.W.G? Ans- 18.
Conductorsof26A.W.Gshallonlybepermittedinwhichcircumstances?Ans-Wherespliced
with a connector listed as suitable for 26 to 24 A.W.G.
HowshouldPFLAconductorsNOTbeinstalled?Ans-PFLAconductorsshallnotbestrapped,
taped or attached to the exterior of any conduit or raceway.
WhatisaPlenumcable?Whatareitscharacteristics?Ans-Cablethatcanbeinstalledin ducts,
plenums or other spaces used for environmental air.
Ithasadequatefireresistanceandlowsmokeproducingcharacteristics.
What is Riser cable? What are its characteristics?Ans- Cable to be used in
verticalwirerunsinshaftsorbetweenfloors.NottobeusedwherePlenumcableisrequired.
Itiscapableofpreventingfirefromrisingfloor-to-floor.
WhatisGeneralPurposecable?Whatareit'scharacteristics?Ans-Cableforgeneralpurpose
fire alarm use. Not to be used where Plenum or Riser cable is required.
Itisresistantto thespreadoffire.
What"type"shallplenumcablebe?Whatsubstitutionsareallowed?Ans-PowerLimited Fire
Alarm Plenum (FPLP) CMP can be substituted.
What"type"shallriserwirebe?Whatsubstitutionsarepermitted?Ans-PowerLimitedFire
Alarm Riser (FPLR) CMP, FPLP, CMR can be substituted.
What"type"shallgeneralpurposewirebe?Whatsubstitutionsarepermitted?Ans-Power
Limited Fire Alarm (FPL) CMP, FPLP, CMR, FPLR, CMG and CM can besubstituted.
(Alltypes)
Whatisthemaximumvoltagepermittedthroughmulti-conductorNPFLAcables?Ans-150
Volts.
Whatis thevoltageratingofPFLAcables?Ans-Notlessthan300 Volts.
ShallthevoltagebemarkedonPLFAcables?Ans-No,becausetheymaybemisinterpreted and
used for electrical applications.
Whatis"RateCompensationDetector"?Ans-Adevicethatrespondswhenthetemperature
reaches a pre-determined level.
Answers with complete solution
WhatdoesPFLAstandfor?Ans-PowerLimitedFireAlarm.
WhatdoesNPFLAstandfor?Ans-Non-PowerLimitedFireAlarm.
WhatmaterialmustNPFLAcircuitconductorsbemadefrom?Ans-Onlysolidorstranded
copper is permitted.
Whatisasinglestationdetector?Ans-
Batterypoweredsmokedetectorsthatdonotcommunicate off premises.
Whatisamultiplestationdetector?Ans-Mainspoweredsmokedetectorswithbatterybackup
that are linked together, so that if one unit initiates, alarms in all detectors willsound.
They do not communicate off premises.
Howfrequentlymusthouseholdsingleandmultiplestationdetectorsbeinspectedandtested
?Ans- In accordance with the manufacturers recommendations, at leastmonthly.
Howfrequentlymusthouseholdfirealarmsystemsbeinspectedandtested?Ans-Atleast every
3 years, by a qualified service technician.
How frequently must heat detectors be tested?Ans- Two or more annually
differentdetectorsmustbetestedeachyearthoughandwithin5yearsalldetectorsmusthavebe
en tested.
Whatdoes"restorable"mean?Ans-Thedetectorcanbe"restored"or"reused"afterithas
initiated an alarm.
Whatdoes"non-restorable"mean?Ans-Thedetectorcannotbe"reused"afterithasinitiated an
alarm. (Think of a heat detector, which self-destructs upon initiating.)
Whatsizeconductorsarepermitted?Ans-Size18A.W.Gand16A.W.Garepermitted,
provided they do not exceed certain rated ampacities.
Whatisusedtoprotecttransformersorotherdevicessuppliedfrompower-
supplyconductors?Ans- An over-current device not rated over 20 Amperes.
Whenlocatedwithin7feetofthefloor,howshallcablesbefastened?Ans-Cablesshall be
fastened in an approved manner at intervals of not more than 18 inches.
, Singleconductorsshallnotbesmaller than A.W.G? Ans- 18.
Conductorsof26A.W.Gshallonlybepermittedinwhichcircumstances?Ans-Wherespliced
with a connector listed as suitable for 26 to 24 A.W.G.
HowshouldPFLAconductorsNOTbeinstalled?Ans-PFLAconductorsshallnotbestrapped,
taped or attached to the exterior of any conduit or raceway.
WhatisaPlenumcable?Whatareitscharacteristics?Ans-Cablethatcanbeinstalledin ducts,
plenums or other spaces used for environmental air.
Ithasadequatefireresistanceandlowsmokeproducingcharacteristics.
What is Riser cable? What are its characteristics?Ans- Cable to be used in
verticalwirerunsinshaftsorbetweenfloors.NottobeusedwherePlenumcableisrequired.
Itiscapableofpreventingfirefromrisingfloor-to-floor.
WhatisGeneralPurposecable?Whatareit'scharacteristics?Ans-Cableforgeneralpurpose
fire alarm use. Not to be used where Plenum or Riser cable is required.
Itisresistantto thespreadoffire.
What"type"shallplenumcablebe?Whatsubstitutionsareallowed?Ans-PowerLimited Fire
Alarm Plenum (FPLP) CMP can be substituted.
What"type"shallriserwirebe?Whatsubstitutionsarepermitted?Ans-PowerLimitedFire
Alarm Riser (FPLR) CMP, FPLP, CMR can be substituted.
What"type"shallgeneralpurposewirebe?Whatsubstitutionsarepermitted?Ans-Power
Limited Fire Alarm (FPL) CMP, FPLP, CMR, FPLR, CMG and CM can besubstituted.
(Alltypes)
Whatisthemaximumvoltagepermittedthroughmulti-conductorNPFLAcables?Ans-150
Volts.
Whatis thevoltageratingofPFLAcables?Ans-Notlessthan300 Volts.
ShallthevoltagebemarkedonPLFAcables?Ans-No,becausetheymaybemisinterpreted and
used for electrical applications.
Whatis"RateCompensationDetector"?Ans-Adevicethatrespondswhenthetemperature
reaches a pre-determined level.
