Nevada C-2C Fire Detection Contractor Examination

On a 24-volt DC notification-appliance circuit, a horn-strobe draws 0.15 A. Using Ohm’s law, what is the device’s equivalent resistance?

• A3.6 ohms
• B16 ohms
• C160 ohms
• D360 ohms

In a series fire-alarm initiating circuit, which quantity is the same at every device?

• ACurrent through the circuit
• BVoltage dropped across each device
• CWattage dissipated by each device
• DResistance of each device

A 24-volt notification appliance draws 125 mA. What electrical power does it consume while sounding?

• A0.33 watt
• B19.2 watts
• C3.0 watts
• D192 watts

Several 24-volt horn-strobes are connected in parallel on one notification-appliance circuit. Which statement is correct?

• AEach appliance sees the full circuit voltage, and the branch currents add at the source
• BThe same current flows through every appliance, and voltages add
• CTotal circuit resistance equals the sum of the individual resistances
• DOpening one appliance automatically opens the entire circuit

Which statement about American Wire Gage (AWG) copper conductors used on fire-detection circuits is correct?

• AA larger AWG number always has a larger cross-section and lower resistance
• B18 AWG and 14 AWG copper have the same resistance per foot
• CAWG size has no effect on voltage drop if the circuit is power-limited
• D14 AWG copper has a larger cross-section and lower resistance per foot than 18 AWG copper

Voltage drop on a fire-alarm notification circuit increases when which combination occurs?

• AShorter run, larger conductors, and lower current
• BLonger run, smaller conductors, and higher alarm current
• CHigher source voltage only; length does not matter
• DUsing stranded copper instead of solid copper of the same AWG

On a supervised conventional initiating-device circuit, which fault typically places a near-zero-resistance path across the pair and is not the same as an open?

• AAn open caused by a broken conductor
• BA missing end-of-line resistor that leaves the pair open
• CA high-resistance splice that still completes the loop
• DA short circuit between the two circuit conductors

Most listed 24-volt horn-strobes are polarized. If the notification-appliance circuit pair is reversed at the last device, what is the expected result?

• AThe appliance typically will not operate, even though the circuit may still show supervis…
• BThe appliance operates at twice the candela rating
• CThe appliance operates normally because polarity never matters on DC circuits
• DThe fire-alarm control unit automatically corrects polarity at every appliance

A 24-volt DC notification circuit has a total conductor resistance of 1.5 ohms and an alarm current of 2.0 A. What voltage remains at the last appliance if the control-unit output is 24.0 V?

• A21.0 V
• B22.5 V
• C24.0 V
• D27.0 V

Which NEC 2017 article specifically covers fire-alarm circuit installation, including power-limited and non-power-limited wiring?

• AArticle 250
• BArticle 300 only, with no fire-alarm article
• CArticle 700
• DArticle 760

Under NEC 2017 Article 760, what distinguishes a power-limited fire-alarm (PLFA) circuit from a non-power-limited fire-alarm (NPLFA) circuit?

• APLFA circuits are limited in voltage and power by a listed power source that complies wit…
• BPLFA circuits may use aluminum conductors; NPLFA circuits must use copper
• CPLFA circuits are always 120 volts AC; NPLFA circuits are always 24 volts DC
• DThere is no installation difference; the labels are manufacturer marketing terms

NEC 2017 Section 760.30 requires fire-alarm circuits to be identified at which locations?

• AOnly on the cover of the fire-alarm control unit
• BAt terminal and junction locations
• COnly where the circuit leaves the building
• DIdentification is optional if red cable is used

The NEC 2017 branch circuit that supplies fire-alarm control equipment shall:

• AAlso supply nearby receptacles so the circuit is easy to find
• BBe taken from a multiwire branch circuit sharing a neutral with lighting
• CSupply no other loads
• DBe permitted to feed door holders and general lighting on the same breaker

NEC 2017 requires the disconnecting means for the fire-alarm equipment branch circuit to be identified in which way?

• ABlue handle, labeled EMERGENCY LIGHTING
• BYellow lock, labeled HVAC ONLY
• CNo special marking, provided the panel schedule lists the circuit as SPARE
• DRed identification, accessible only to qualified personnel, and labeled FIRE ALARM CIRCUIT

May the NEC 2017 fire-alarm equipment branch circuit be supplied through a GFCI or AFCI device?

• AYes; 210.8 always overrides Article 760
• BYes, if the control unit is in a dwelling garage
• CNo; 760.41(B) and 760.121(B) prohibit supplying that branch circuit through GFCI or AFCI…
• DOnly the notification circuits must be GFCI-protected

Which listed power-limited fire-alarm cable type is suitable for use in ducts, plenums, and other spaces used for environmental air under NEC 2017?

• AType FPL (general-purpose only)
• BType FPLR (riser)
• CType FPLP (plenum)
• DType NM-B

A power-limited fire-alarm cable is installed vertically in a shaft from the first floor to the roof and is not in a plenum. Which listing is the minimum that satisfies NEC 2017 cable substitution rules for that riser?

• AType FPL only
• BType FPLR or a higher listing such as FPLP
• CType CM (communications) with no fire-alarm listing
• DType UF buried-feeder cable

NEC 2017 requires what action for the accessible portion of abandoned fire-alarm cable?

• ARemove it, unless it is tagged for future use
• BLeave it in place if it is the same color as the new cable
• CEnergize it so it remains supervised
• DPaint it red and abandon it in the ceiling

NEC 2017 Section 760.143 addresses support of power-limited fire-alarm conductors. Which installation is prohibited?

• ASupporting PLFA cable from independent straps or J-hooks listed for the purpose
• BInstalling PLFA cable in its own raceway
• CStrapping, taping, or attaching PLFA conductors to the exterior of a conduit as a means o…
• DPulling PLFA cable in a dedicated cable tray

For power-limited fire-alarm wiring under NEC 2017 760.142, single conductors shall not be smaller than which size?

• A26 AWG
• B22 AWG
• C18 AWG
• D12 AWG

NEC 2017 generally requires PLFA conductors to be kept separate from electric light, power, Class 1, and NPLFA conductors. Which method satisfies that separation where the conductors are not in a raceway or metal-sheathed cable?

• ATwisting the PLFA pair around the 120-volt lighting conductors
• BPainting the power conductors red
• CA single wire nut joining a 120-volt conductor to the PLFA pair
• DA continuous barrier, separate raceway, or at least 2 inches of separation

Why is a T-tap generally unacceptable on a conventional Class B initiating-device circuit that uses an end-of-line resistor for supervision?

• AT-taps increase candela on smoke detectors
• BA break on the tapped branch is not seen by the end-of-line supervisory current, so that…
• CNFPA 72 (2007) requires every IDC to be Class A
• DT-taps are required so the end-of-line resistor can be mounted at the panel

Under NFPA 72 (2007) circuit style designations still used on the Nevada C-2C exam, which pairing is correct?

• AStyle B initiating-device circuit is a Class B path that ends at an end-of-line device; S…
• BStyle B is always a signaling-line circuit; Style D is always a notification circuit
• CStyle 7 is a Class B notification circuit with no isolators
• DStyle Y is a Class A initiating-device circuit

NEC 2017 Section 760.49 generally requires fire-alarm circuit conductors to be which metal?

• AAluminum only
• BCopper-clad aluminum without restriction
• CCopper
• DAny metal if the insulation is 600 V

What is the primary purpose of the equipment grounding conductor on a fire-alarm control unit?

• ATo carry the 24-volt notification-appliance operating current
• BTo replace the circuit breaker on the dedicated branch circuit
• CTo serve as the signaling-line-circuit return conductor
• DTo provide a low-impedance path that clears a ground fault and keeps non-current-carrying…

The metal enclosure of a fire-alarm control unit supplied by a 120-volt branch circuit shall be:

• AConnected to the equipment grounding conductor of the supplying circuit
• BLeft ungrounded so ground faults cannot be detected
• CBonded only to a driven rod that is isolated from the building grounding electrode system
• DPainted red in lieu of any grounding connection

Metal raceways, boxes, and fittings that enclose fire-alarm circuit conductors shall be:

• ABonded to form an electrically continuous equipment grounding path
• BIsolated from ground so the circuit remains floating
• CUsed as the 24-volt notification return instead of a copper conductor
• DFilled with isolated-ground receptacles

When a fire-alarm initiating or signaling-line circuit develops an unintended connection to earth (a ground fault), NFPA 72 (2007) expects the control unit to:

• AIgnore the condition because earth is the intended return path
• BIndicate a trouble (or other off-normal) condition so the fault can be found
• CAutomatically raise notification-appliance candela
• DConvert the circuit from power-limited to non-power-limited

An installer proposes to land the fire-alarm control-unit grounding conductor only on an isolated-ground receptacle terminal and not on the equipment grounding system of the dedicated branch circuit. Is that an acceptable NEC 2017 grounding method?

• AYes; isolated-ground receptacles are required for all fire-alarm panels
• BYes, if the isolated-ground conductor is green with a yellow stripe
• CNo; the control unit must be grounded by the equipment grounding conductor of its supplyi…
• DNo grounding conductor is required if the enclosure is painted red

NFPA 72 (2007) treats the primary power supply for a protected-premises fire-alarm system as which source?

• AA dry-cell battery that is never recharged
• BThe notification-appliance circuit itself
• CSolar panels without a connection to premises wiring
• DA reliable commercial light-and-power source, or an equivalent engine-driven source arran…

The most common secondary power supply for a protected-premises fire-alarm control unit is:

• AA receptacle on a nearby lighting circuit
• BStorage batteries dedicated to the fire-alarm system
• CA USB power bank plugged into a detector
• DThe building sprinkler riser

For a protected-premises fire-alarm system that is not an emergency voice/alarm communications system, NFPA 72 (2007) requires storage-battery secondary power to operate the system under quiescent load for a minimum of 24 hours and then operate alarm notification appliances for at least:

• A30 seconds
• B30 minutes
• C5 minutes
• D2 hours

If the fire-alarm system includes in-building emergency voice/alarm communications, NFPA 72 (2007) increases the required alarm-operation time on secondary power from 5 minutes to:

• A8 minutes
• B10 minutes
• C15 minutes
• D60 minutes

NEC 2017 requires the location of the fire-alarm branch-circuit overcurrent protective device to be permanently identified where?

• AAt the fire-alarm control unit
• BOnly in the project specifications, not in the building
• COnly on the inside of the battery box
• DOnly at the serving utility transformer

The dedicated fire-alarm branch circuit disconnecting means is permitted to be:

• AA lighting dimmer shared with lobby downlights
• BA GFCI receptacle in a restroom
• CA plug-and-cord connection to a convenience receptacle
• DSecured in the closed (ON) position so it is not switched off accidentally

A non-voice fire-alarm control unit has a standby current of 0.50 A and an alarm current of 2.0 A. Using NFPA 72 (2007) capacity of 24 hours standby plus 5 minutes of alarm, and the 1.2 correction factor used with that edition, what is the minimum calculated battery capacity?

• A2.4 ampere-hours
• B12.0 ampere-hours
• C14.6 ampere-hours
• D48.0 ampere-hours

When an automatic-starting engine-driven generator is used as the secondary supply in accordance with NFPA 72 (2007), the storage batteries at the control unit are sized for which reduced standby interval (plus the required alarm operation)?

• A15 minutes
• B1 hour
• C4 hours
• D24 hours still, with no reduction

Most protected-premises fire-alarm control units provide a nominal secondary (battery) voltage of:

• A6 volts DC from a single lantern battery
• B24 volts DC, commonly two 12-volt batteries in series
• C277 volts AC taken from a lighting phase
• D480 volts AC from a motor control center

Compared with a spot-type heat detector, a spot-type smoke detector is generally selected when the design goal is:

• ATo ignore smoldering fires until flaming occurs
• BTo replace occupant-notification appliances
• CTo detect only sprinkler waterflow
• DEarlier warning from visible or invisible products of combustion, which appear before a l…

A photoelectric spot-type smoke detector is generally more responsive than an ionization detector to which kind of fire?

• AA fast-flaming fire that produces very small, almost invisible particles
• BA smoldering fire that produces larger, visible smoke particles
• CA fire that produces only heat and no smoke
• DA fire inside a sealed metal cabinet with no smoke path

An ionization spot-type smoke detector is generally more responsive than a photoelectric detector to which kind of fire?

• AA fast-flaming fire that produces very small combustion particles
• BA smoldering upholstered-furniture fire that produces large visible particles
• CA fire that produces only a slow temperature rise and no particles
• DA cooking-steam event in a bathroom

In a commercial kitchen or an unheated parking garage, which automatic initiating device is ordinarily selected instead of a spot-type smoke detector?

• AA photoelectric smoke detector mounted over the range
• BAn ionization smoke detector inside the walk-in cooler
• CA heat detector listed for the temperature and environment
• DA projected-beam smoke detector aimed through steam

A fixed-temperature spot-type heat detector initiates an alarm when:

• AThe detector reaches its listed operating temperature, regardless of how slowly the tempe…
• BSmoke obscuration reaches 4 percent per foot
• CThe occupant pulls the handle
• DWater begins to flow in a sprinkler pipe

When a spot-type smoke detector is mounted on a wall, NFPA 72 (2007) requires the top of the detector to be how far from the ceiling?

• AFlush with the finished floor
• BAt 80 to 96 inches above the floor, like a strobe
• CExactly 36 inches below the ceiling
• DNot less than 4 inches and not more than 12 inches from the ceiling

A ceiling-mounted spot-type smoke detector shall be kept at least how far from a sidewall?

• A1 inch
• B4 inches
• C24 inches
• D10 feet

On a smooth, flat ceiling, the listed spacing most commonly used for spot-type smoke detectors is:

• A10 feet on center
• B100 feet on center
• C75 feet on center
• D30 feet on center

A spot-type smoke detector has a listed smooth-ceiling spacing S of 30 feet. Measured at a right angle from a wall, the detector shall be no farther than which distance from that wall?

• A15 feet (S/2)
• B7.5 feet (S/4)
• C21 feet (0.7S)
• D30 feet (S)