1. NEC Article 725 — Class 1, Class 2, and Class 3 Circuits: Power source limits,
circuit classifications, separation requirements, and permitted wiring methods.
2. NEC Article 760 — Fire Alarm Systems: Non-power-limited vs. power-limited
fire alarm circuits, conductor identification, overcurrent protection, and
disconnecting means.
3. NEC Article 770 — Optical Fiber Cables: Nonconductive vs. conductive fiber,
installation requirements, and raceway sharing rules.
4. NEC Article 800 — Communications Circuits: Primary protectors, abandoned
cable removal, lightning clearance, and entrance requirements.
5. NEC Article 805 — Network-Powered Broadband Communications: Bonding
jumpers, primary electrical protection, and outside plant cable limitations.
6. Grounding and Bonding (NEC Article 250 / TIA-607): Telecommunications
bonding infrastructure, single-point grounding, ground fault current paths, and
TMGB.
7. Structured Cabling Standards (TIA-568 / TIA-569 / TIA-606): Cable
categories, bend radius, termination patterns, and administration labeling.
8. Electrical Fundamentals for Low Voltage: AC/DC theory, signal characteristics
(amplitude, frequency), circuit faults, and conductor properties (AWG,
ampacity).
9. Raceways and Wiring Methods (NEC Chapter 3): Wireways, cable trays,
conduit bodies, riser-rated cables (FPLR), and plenum-rated cables (FPLP).
,10. Arizona ROC Statutes and Rules: Licensing requirements (A.R.S. § 32-1121),
experience verification, bond requirements, and scope of CR-67 work.
Arizona Contractor License CR-67 EXAM LATEST
250 Detailed Multiple-Choice Questions with Answers and Rationales
1. Under NEC Article 725, a Class 2 circuit is defined as a power-limited circuit
that operates at a maximum voltage threshold of how many volts under normal
operating conditions?
A. 30 volts
B. 50 volts
C. 100 volts
D. 150 volts
Correct Answer: A
Rationale: Class 2 circuits are power-limited and defined by NEC Article 725 as
operating at 30 volts or less under normal conditions, ensuring they cannot ignite
a flammable atmosphere or present a shock hazard . 7
2. When installing Class 2 or Class 3 conductors in proximity to electric light or
power conductors without a permanent barrier, what is the minimum required
separation distance according to NEC 725.136?
A. 2 inches
B. 6 inches
C. 12 inches
D. 24 inches
,Correct Answer: A
Rationale: NEC 725.136(A) mandates a minimum separation of 2 inches (50 mm)
between Class 2/3 conductors and ungrounded power or Class 1 conductors to
prevent induction and insulation breakdown . 4
3. Which cable type is specifically rated for installation in vertical riser shafts
without the need for additional conduit protection?
A. FPLP
B. FPLR
C. FPL
D. NPLF
Correct Answer: B
Rationale: The "R" in FPLR stands for Riser-rated, indicating the cable is fire-
resistant enough to be installed in vertical shafts without conduit, whereas FPLP is
for plenum spaces . 1
4. According to NEC Article 800, what action must be taken regarding accessible
abandoned communications cables during a building renovation?
A. They must be removed unless tagged for future use
B. They may remain indefinitely if insulated at both ends
C. They must be painted orange for identification
D. Only plenum cables must be removed
Correct Answer: A
Rationale: NEC 800.25 requires the removal of accessible abandoned
, communications cables to prevent confusion and fire spread, unless they are
tagged for future use with a durable tag . 4
5. In a telecommunications grounding system, the Main Distribution Frame
(MDF) serves primarily as what function for voice and data circuits?
A. The internal demarcation and distribution point
B. The building-level main cross-connect point
C. The grounding electrode conductor connection
D. The equipment room cooling unit
Correct Answer: B
Rationale: The MDF is the building-level main cross-connect that serves as the
primary demarcation point for external carrier circuits entering the building . 1
6. What does the term "ampacity" specifically refer to when selecting
conductors for low voltage communication systems?
A. The maximum voltage the insulation can withstand
B. The allowable current-carrying capacity of a conductor
C. The resistance of the conductor per thousand feet
D. The frequency rating of the signal
Correct Answer: B
Rationale: Ampacity is defined as the maximum current a conductor can carry
continuously under specified conditions without exceeding its temperature rating
. 3
circuit classifications, separation requirements, and permitted wiring methods.
2. NEC Article 760 — Fire Alarm Systems: Non-power-limited vs. power-limited
fire alarm circuits, conductor identification, overcurrent protection, and
disconnecting means.
3. NEC Article 770 — Optical Fiber Cables: Nonconductive vs. conductive fiber,
installation requirements, and raceway sharing rules.
4. NEC Article 800 — Communications Circuits: Primary protectors, abandoned
cable removal, lightning clearance, and entrance requirements.
5. NEC Article 805 — Network-Powered Broadband Communications: Bonding
jumpers, primary electrical protection, and outside plant cable limitations.
6. Grounding and Bonding (NEC Article 250 / TIA-607): Telecommunications
bonding infrastructure, single-point grounding, ground fault current paths, and
TMGB.
7. Structured Cabling Standards (TIA-568 / TIA-569 / TIA-606): Cable
categories, bend radius, termination patterns, and administration labeling.
8. Electrical Fundamentals for Low Voltage: AC/DC theory, signal characteristics
(amplitude, frequency), circuit faults, and conductor properties (AWG,
ampacity).
9. Raceways and Wiring Methods (NEC Chapter 3): Wireways, cable trays,
conduit bodies, riser-rated cables (FPLR), and plenum-rated cables (FPLP).
,10. Arizona ROC Statutes and Rules: Licensing requirements (A.R.S. § 32-1121),
experience verification, bond requirements, and scope of CR-67 work.
Arizona Contractor License CR-67 EXAM LATEST
250 Detailed Multiple-Choice Questions with Answers and Rationales
1. Under NEC Article 725, a Class 2 circuit is defined as a power-limited circuit
that operates at a maximum voltage threshold of how many volts under normal
operating conditions?
A. 30 volts
B. 50 volts
C. 100 volts
D. 150 volts
Correct Answer: A
Rationale: Class 2 circuits are power-limited and defined by NEC Article 725 as
operating at 30 volts or less under normal conditions, ensuring they cannot ignite
a flammable atmosphere or present a shock hazard . 7
2. When installing Class 2 or Class 3 conductors in proximity to electric light or
power conductors without a permanent barrier, what is the minimum required
separation distance according to NEC 725.136?
A. 2 inches
B. 6 inches
C. 12 inches
D. 24 inches
,Correct Answer: A
Rationale: NEC 725.136(A) mandates a minimum separation of 2 inches (50 mm)
between Class 2/3 conductors and ungrounded power or Class 1 conductors to
prevent induction and insulation breakdown . 4
3. Which cable type is specifically rated for installation in vertical riser shafts
without the need for additional conduit protection?
A. FPLP
B. FPLR
C. FPL
D. NPLF
Correct Answer: B
Rationale: The "R" in FPLR stands for Riser-rated, indicating the cable is fire-
resistant enough to be installed in vertical shafts without conduit, whereas FPLP is
for plenum spaces . 1
4. According to NEC Article 800, what action must be taken regarding accessible
abandoned communications cables during a building renovation?
A. They must be removed unless tagged for future use
B. They may remain indefinitely if insulated at both ends
C. They must be painted orange for identification
D. Only plenum cables must be removed
Correct Answer: A
Rationale: NEC 800.25 requires the removal of accessible abandoned
, communications cables to prevent confusion and fire spread, unless they are
tagged for future use with a durable tag . 4
5. In a telecommunications grounding system, the Main Distribution Frame
(MDF) serves primarily as what function for voice and data circuits?
A. The internal demarcation and distribution point
B. The building-level main cross-connect point
C. The grounding electrode conductor connection
D. The equipment room cooling unit
Correct Answer: B
Rationale: The MDF is the building-level main cross-connect that serves as the
primary demarcation point for external carrier circuits entering the building . 1
6. What does the term "ampacity" specifically refer to when selecting
conductors for low voltage communication systems?
A. The maximum voltage the insulation can withstand
B. The allowable current-carrying capacity of a conductor
C. The resistance of the conductor per thousand feet
D. The frequency rating of the signal
Correct Answer: B
Rationale: Ampacity is defined as the maximum current a conductor can carry
continuously under specified conditions without exceeding its temperature rating
. 3
