Arizona ROC CR-67 Low Voltage Communication Systems Examination

According to NEC Article 725, what is the maximum power rating (in VA) allowed for a inherently limited Class 2 power source operating at AC voltages up to 30 volts?

• A100 VA
• B250 VA
• C300 VA
• D500 VA

In communications cabling installations under NEC Article 800, which cable type is permitted as a direct substitute for Type CMR (Riser) communications cable?

• AType CMP
• BType CMG
• CType CM
• DType CMX

Which optical fiber cable type is designated by NEC Article 770 for installation in ducts, plenums, and other spaces used for environmental air, containing nonconductive materials only?

• AType OFNP
• BType OFCP
• CType OFNR
• DType OFNG

According to NEC Article 760, which Power-Limited Fire Alarm (PLFA) cable rating is required for vertical runs in a shaft penetrating more than one floor?

• AType FPLR
• BType FPL
• CType PLTC
• DType CL2

Under NEC 725.136, what is the minimum required separation distance between Class 2 or Class 3 conductors and ungrounded electric light, power, or Class 1 conductors when not separated by a permanent barrier?

• A2 inches (50 mm)
• B6 inches (150 mm)
• C12 inches (300 mm)
• D24 inches (600 mm)

What does NEC Article 800 require regarding accessible abandoned communications cables during building renovation?

• AAccessible abandoned cables must be removed unless tagged for future use.
• BAbandoned cables may remain indefinitely if insulated at both ends.
• CAll abandoned cables must be painted orange for identification.
• DOnly plenum cables must be removed; riser cables are exempt.

Under NEC 770.133, nonconductive optical fiber cables (Type OFNP/OFNR) may occupy the same raceway or enclosure with electric light and power conductors ONLY if:

• AThe optical fiber cables are serving the power-utilization equipment.
• BThe power conductors operate at less than 120 volts.
• CThe fiber cable is metallic-armored.
• DThe raceway is installed underground.

Where must a listed primary protector be located for communications circuits entering a building according to NEC 800.90?

• AIn immediate proximity to the point of entrance.
• BAt the main distribution frame regardless of entrance distance.
• CAt least 50 feet inside the building perimeter.
• DOn the roof exterior adjacent to the service mast.

Which wiring method requirement applies to Class 1 remote-control and signaling circuits governed by NEC 725.46?

• AClass 1 circuits must be installed in accordance with Chapter 3 wiring methods.
• BClass 1 circuits may use open unjacketed thermostat wire in drop ceilings.
• CClass 1 circuits are limited to 30 volts maximum.
• DClass 1 circuits do not require overcurrent protection.

Under NEC 800.53, what is the minimum required clearance between open communications conductors and lightning protection system conductors?

• A6 feet (1.8 m)
• B2 feet (600 mm)
• C10 feet (3.0 m)
• D12 inches (300 mm)

A fire alarm system circuit operates at 120 VAC and supplies power to alarm notification control panels. How is this circuit classified under NEC Article 760?

• ANon-Power-Limited Fire Alarm (NPLFA) circuit
• BPower-Limited Fire Alarm (PLFA) circuit
• CClass 2 signaling circuit
• DCommunications Article 800 circuit

Under NEC 725.144, when installing 4-pair 24 AWG Category 6 cables carrying 4PPoE (Type 4, 0.5 A per conductor) in a bundle of 91 cables without airflow, what compliance metric determines maximum safe current?

• AAmpacity limits from NEC Table 725.144 to prevent exceeding conductor temperature ratings.
• BConduit fill percentage limits specified in Chapter 9 Table 1.
• CInsulation breakdown voltage rating of 300V.
• DDC resistance imbalance per TIA-568.

Which type of listed optical fiber raceway is permitted to be installed in environmental air plenums per NEC 770.110?

• APlenum Optical Fiber Raceway
• BRiser Optical Fiber Raceway
• CGeneral-Purpose Optical Fiber Raceway
• DFlexible Metal Conduit without listing

Under NEC 800.44, what is the minimum required vertical clearance for overhead communications drop wires above residential driveways?

• A11.5 feet (3.5 m)
• B8.0 feet (2.45 m)
• C15.5 feet (4.7 m)
• D18.0 feet (5.5 m)

Under NEC Article 805, metallic sheath communications cables entering a building must be grounded or interrupted by an insulating joint as close as practicable to:

• AThe point of entrance.
• BThe telecommunications grounding busbar in the main TR.
• CThe branch circuit panelboard neutral bus.
• DThe rooftop antenna mount.

Which standard fire test is used to certify Type CL2P and CMP plenum cables for low flame spread and smoke generation under NEC Article 725 and 800?

• ANFPA 262 (Steiner Tunnel Test)
• BUL 1666 (Riser Flame Test)
• CIEEE 1202 (Vertical Tray Flame Test)
• DASTM E84 (Surface Burning Building Materials)

What is the maximum allowable continuous volt-ampere (VA) output rating for a Power-Limited Fire Alarm (PLFA) transformer power source under NEC 760.121?

• A100 VA
• B300 VA
• C500 VA
• D1000 VA

Type CMX communications cable is designated under NEC Article 800 for which specific type of installation?

• ALimited-use residential cabling in raceways or exposed runs under 10 feet.
• BVertical riser shafts in high-rise commercial structures.
• CEnvironmental air plenums without conduit.
• DDirect burial underground without conduit.

How does NEC 770.2 classify an optical fiber cable that contains both optical fibers and current-carrying electrical conductors?

• AComposite Optical Fiber Cable
• BNonconductive Optical Fiber Cable
• CHybrid Fiber-Coaxial (HFC) Cable
• DClass 1 Power Cable

Under NEC 725.136(D), Class 2 circuit conductors may enter an enclosure containing electric light or power conductors ONLY IF:

• AThe Class 2 conductors are connected to equipment powered by the same electric light or p…
• BThe Class 2 conductors operate at less than 12V DC.
• CThe enclosure is constructed of nonmetallic PVC.
• DThe power circuit is protected by a GFCI breaker.

According to NEC 800.47, underground communications wires and cables in raceways must maintain what separation from underground electric light and power conductors?

• ASeparation by at least 12 inches of earth or concrete, or in a listed conduit.
• BMust be placed in the same trench directly contacting power cables.
• CMinimum 36 inches separation under all circumstances.
• DNo separation required if both are jacketed in PVC.

What is the minimum conductor size permitted for solid copper Power-Limited Fire Alarm (PLFA) field-installed single conductors under NEC 760.142?

• A18 AWG
• B22 AWG
• C24 AWG
• D14 AWG

What is the minimum size copper grounding conductor allowed by NEC 800.100(A)(3) for connecting a communications primary protector to the grounding electrode system?

• A14 AWG
• B10 AWG
• C6 AWG
• D4 AWG

Under NEC 800.100(A)(4), what is the maximum recommended length for the communications grounding electrode conductor connecting the primary protector to the building grounding electrode system?

• A20 feet (6.0 m)
• B10 feet (3.0 m)
• C30 feet (9.0 m)
• D50 feet (15.0 m)

An Intersystem Bonding Termination (IBT) installed per NEC 250.94 must provide access to a minimum of how many individual bonding terminals?

• A3 terminals
• B2 terminals
• C5 terminals
• D6 terminals

What are the minimum standard physical dimensions for a Telecommunications Main Grounding Busbar (TMGB) under ANSI/TIA-607-D?

• A1/4 in. thick x 4 in. wide (6.3 mm x 100 mm)
• B1/8 in. thick x 2 in. wide (3.2 mm x 50 mm)
• C3/8 in. thick x 6 in. wide (9.5 mm x 150 mm)
• D1/2 in. thick x 4 in. wide (12.7 mm x 100 mm)

Under ANSI/TIA-607-D, what are the minimum physical dimensions for a Telecommunications Grounding Busbar (TGB) located in a floor telecommunications room?

• A1/4 in. thick x 2 in. wide (6.3 mm x 50 mm)
• B1/4 in. thick x 4 in. wide (6.3 mm x 100 mm)
• C1/8 in. thick x 1 in. wide (3.2 mm x 25 mm)
• D1/2 in. thick x 3 in. wide (12.7 mm x 75 mm)

A Telecommunications Bonding Backbone (TBB) conductor has a total linear length of 145 feet between the TMGB and a distant TGB. According to TIA-607-D recommendations, what minimum conductor size (AWG) should be selected?

• A2/0 AWG copper
• B6 AWG copper
• C3/0 AWG copper
• D10 AWG copper

In a multistory building with multiple TBBs, what is the purpose of installing Telecommunications Bonding Equalizers (TBE) / Equalizing Conductors between TGBs on upper floors per TIA-607-D?

• ATo equalize potential between different telecommunications grounding busbars on the same…
• BTo supply 120V AC backup power to network switches.
• CTo eliminate the need for grounding the TMGB to building structural steel.
• DTo replace vertical riser optical fiber cables.

How does a gas discharge tube (GDT) primary protector respond when exposed to a high-voltage lightning surge on incoming copper lines?

• AThe gas ionizes, changing from a high-impedance state to a short-circuit arc state that s…
• BThe gas expands mechanically to trip a thermal circuit breaker.
• CThe gas absorbs the electrical energy and converts it into heat inside the jacket.
• DThe tube fuses permanently open to disconnect the incoming line.

Why must communications grounding and bonding conductors be installed in as straight a line as possible without sharp 90-degree bends?

• ASharp bends dramatically increase high-frequency surge impedance, causing lightning energ…
• BSharp bends cause copper wire to fracture under normal room temperatures.
• C90-degree bends increase DC resistance by 50 percent.
• DNEC code prohibits bending any solid copper wire beyond 45 degrees.

Under NEC 250.52(A)(2), effectively grounded structural building steel used as a grounding electrode must have a minimum connection to earth provided by:

• A10 feet or more of structural steel member in direct contact with earth or bonded to conc…
• BA single 4-foot ground rod attached with a pipe clamp.
• CWater pipe bonding within 15 feet of building entry.
• DAn isolated copper plate buried 1 foot deep.

When installing Shielded Twisted-Pair (STP / F/UTP) cabling networks, how should cable foil shields be grounded per ANSI/TIA-607-D to prevent ground loops while maintaining EMI shielding?

• AShields must be continuously grounded at the patch panel end to the TGB; outlets may be g…
• BShields must be left completely un-grounded at both ends to avoid electrical noise.
• CShields must be bonded directly to the neutral bar of the nearest 120V panelboard.
• DShields must be grounded only at the work area outlet and floating at the TR patch panel.

What minimum size green-insulated copper conductor is required by ANSI/TIA-607-D to bond equipment racks and cabinets to the local TGB?

• A6 AWG copper
• B12 AWG copper
• C14 AWG copper
• D1/0 AWG copper

What causes 60 Hz hum or audio noise in low-voltage inter-building signaling circuits, and what is the primary technical solution?

• APotential difference between distant building grounds creating ground loop current; solve…
• BExcessive wire gauge; solved by reducing wire size to 24 AWG.
• CHigh atmospheric pressure; solved by installing pressurized conduit.
• DUsing plenum cable instead of riser cable.

Solid-state silicon avalanche diode (SAD) primary protectors differ from traditional gas discharge tubes primarily because SAD devices provide:

• AExtremely fast sub-nanosecond clamping response times and precise voltage clamping.
• BHigher surge current handling capability up to 50,000 Amperes.
• CLower initial purchase cost with zero power loss.
• DMechanical isolation switches that physically drop out.

According to ANSI/TIA-569-E and NEC Chapter 9 Table 1, what is the maximum allowable conduit fill percentage when installing three or more communications cables in a single raceway?

• A40 percent
• B53 percent
• C31 percent
• D60 percent

Under ANSI/TIA-569-E, a pull box must be placed in a conduit run after a maximum distance of 100 feet (30 meters) OR after a cumulative total of how many degrees of bends?

• A180 degrees (two 90-degree bends)
• B360 degrees (four 90-degree bends)
• C270 degrees (three 90-degree bends)
• D90 degrees (one 90-degree bend)

What is the recommended maximum spacing interval between non-continuous cable supports (such as J-hooks or bridle rings) for Category 6A UTP cabling per ANSI/TIA-569-E?

• A4 to 5 feet (1.2 to 1.5 meters)
• B8 to 10 feet (2.4 to 3.0 meters)
• C2 to 3 feet (0.6 to 0.9 meters)
• D12 feet (3.7 meters)

According to NEC 300.11(B), low-voltage communication cables above suspended ceilings must NOT be supported by:

• AThe ceiling grid support wires.
• BIndependent support wires dedicated solely to telecom pathways.
• CWall-mounted J-hooks.
• DThreaded rod trapeze hangers.

For a commercial building floor with 10,000 square feet of usable office space, what is the minimum recommended Telecommunications Room (TR) floor dimension under ANSI/TIA-569-E?

• A10 ft x 11 ft (3.0 m x 3.4 m)
• B7 ft x 9 ft (2.1 m x 2.7 m)
• C6 ft x 6 ft (1.8 m x 1.8 m)
• D12 ft x 18 ft (3.7 m x 5.5 m)

What is the specification for backboard material mounted on TR walls for terminating telecommunications equipment per ANSI/TIA-569-E?

• A3/4-inch (19 mm) A-C grade fire-retardant plywood painted with two coats of fire-retardan…
• B1/2-inch exterior grade CDX sheet metal backed plywood.
• C5/8-inch standard Type X drywall over wood studs.
• D1-inch pressure-treated outdoor lumber.

You must install twelve Category 6A UTP cables into a single EMT conduit. Each cable has an overall outside diameter of 0.30 inches. Applying the NEC 40% maximum fill rule for 3+ cables, what is the minimum trade size EMT conduit required?

• A1-1/4 inch EMT
• B3/4 inch EMT
• C1 inch EMT
• D2 inch EMT

Under ANSI/TIA-569-E, what is the maximum recommended cable fill depth inside a telecommunications cable tray pathway?

• A6 inches (150 mm)
• B12 inches (300 mm)
• C3 inches (75 mm)
• D18 inches (450 mm)

When bending EMT conduit to house optical fiber cables, what minimum bend radius multiplier must be applied relative to the internal conduit diameter for conduits larger than 2 trade sizes per ANSI/TIA-569-E?

• A10 times internal conduit diameter
• B6 times internal conduit diameter
• C4 times internal conduit diameter
• D20 times internal conduit diameter

In firestop penetration testing under ASTM E814 / UL 1479, what does the 'F-Rating' represent?

• AThe time in hours that the firestop system prevents flame passage through the penetration.
• BThe temperature rise limit on the unexposed side of the wall.
• CThe air leakage rate in cubic feet per minute.
• DThe water resistance pressure rating in PSI.