NEW MEXICO (NM) ES-7J JOURNEYMAN
TELEPHONE COMMUNICATION &
TELEPHONE INTERCONNECT SYSTEMS
PRACTICE EXAM 2026/2027 WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS |CURRENTLY TESTING
QUESTIONS AND SOLUTIONS|ALREADY
GRADED A+|NEWEST|JUST
RELEASED!!|GUARANTEED PASS
Question 1
Which NEC article primarily governs telephone and data communication circuits?
A. Article 725
B. Article 760
C. Article 800
D. Article 300
Answer: C
Explanation: NEC Article 800 specifically covers communications circuits including
telephone, data, and similar low-voltage systems, providing installation, grounding, and
protection requirements.
Question 2
The demarcation point (DEMARC) is best defined as:
,A. The location of the PBX system
B. The point where customer wiring connects to the service provider’s network
C. The grounding electrode location
D. The first telephone outlet
Answer: B
Explanation: The DEMARC is the physical point where the telephone company’s
responsibility ends and the customer’s wiring begins. It is crucial for maintenance and
troubleshooting.
Question 3
Which NEC article governs Class 2 and Class 3 signaling circuits used in telephone
systems?
A. Article 725
B. Article 770
C. Article 820
D. Article 250
Answer: A
Explanation: Article 725 covers Class 1, 2, and 3 remote-control and signaling circuits,
providing voltage, current, and safety limits for low-voltage systems.
Question 4
Which cable rating is required when telephone cabling is installed in an environmental air
plenum?
A. CM
B. CMR
C. CMP
D. CL2
,Answer: C
Explanation: CMP (plenum-rated) cable must be used in air-handling spaces to reduce
smoke and toxic fume production during a fire.
Question 5
What is the primary purpose of grounding telephone communication systems?
A. Improve voice clarity
B. Increase data speed
C. Protect equipment and personnel from surges and faults
D. Reduce installation cost
Answer: C
Explanation: Grounding ensures that voltage surges, lightning strikes, and faults are safely
diverted to earth, protecting both equipment and personnel.
Question 6
Which NEC article addresses grounding and bonding requirements for communication
systems?
A. Article 300
B. Article 725
C. Article 250
D. Article 820
Answer: C
Explanation: Article 250 provides comprehensive requirements for grounding and bonding
of both electrical and communication systems to ensure safety.
Question 7
, Which device limits voltage and current in a Class 2 telephone circuit?
A. Circuit breaker
B. Transformer or listed power supply
C. Fuse
D. Disconnect switch
Answer: B
Explanation: Class 2 circuits are power-limited by a listed transformer or power supply to
ensure safety limits are not exceeded.
Question 8
Which standard governs labeling and administration of telecommunications cabling?
A. NEC Article 800
B. NFPA 72
C. TIA/EIA-606
D. OSHA 1910
Answer: C
Explanation: TIA/EIA-606 sets standards for labeling, administration, and documentation
of telecommunications infrastructure to support maintenance and compliance.
Question 9
What type of test verifies correct conductor termination and polarity in telephone cabling?
A. Certification test
B. Megger test
C. Wire map test
D. Load test
TELEPHONE COMMUNICATION &
TELEPHONE INTERCONNECT SYSTEMS
PRACTICE EXAM 2026/2027 WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS |CURRENTLY TESTING
QUESTIONS AND SOLUTIONS|ALREADY
GRADED A+|NEWEST|JUST
RELEASED!!|GUARANTEED PASS
Question 1
Which NEC article primarily governs telephone and data communication circuits?
A. Article 725
B. Article 760
C. Article 800
D. Article 300
Answer: C
Explanation: NEC Article 800 specifically covers communications circuits including
telephone, data, and similar low-voltage systems, providing installation, grounding, and
protection requirements.
Question 2
The demarcation point (DEMARC) is best defined as:
,A. The location of the PBX system
B. The point where customer wiring connects to the service provider’s network
C. The grounding electrode location
D. The first telephone outlet
Answer: B
Explanation: The DEMARC is the physical point where the telephone company’s
responsibility ends and the customer’s wiring begins. It is crucial for maintenance and
troubleshooting.
Question 3
Which NEC article governs Class 2 and Class 3 signaling circuits used in telephone
systems?
A. Article 725
B. Article 770
C. Article 820
D. Article 250
Answer: A
Explanation: Article 725 covers Class 1, 2, and 3 remote-control and signaling circuits,
providing voltage, current, and safety limits for low-voltage systems.
Question 4
Which cable rating is required when telephone cabling is installed in an environmental air
plenum?
A. CM
B. CMR
C. CMP
D. CL2
,Answer: C
Explanation: CMP (plenum-rated) cable must be used in air-handling spaces to reduce
smoke and toxic fume production during a fire.
Question 5
What is the primary purpose of grounding telephone communication systems?
A. Improve voice clarity
B. Increase data speed
C. Protect equipment and personnel from surges and faults
D. Reduce installation cost
Answer: C
Explanation: Grounding ensures that voltage surges, lightning strikes, and faults are safely
diverted to earth, protecting both equipment and personnel.
Question 6
Which NEC article addresses grounding and bonding requirements for communication
systems?
A. Article 300
B. Article 725
C. Article 250
D. Article 820
Answer: C
Explanation: Article 250 provides comprehensive requirements for grounding and bonding
of both electrical and communication systems to ensure safety.
Question 7
, Which device limits voltage and current in a Class 2 telephone circuit?
A. Circuit breaker
B. Transformer or listed power supply
C. Fuse
D. Disconnect switch
Answer: B
Explanation: Class 2 circuits are power-limited by a listed transformer or power supply to
ensure safety limits are not exceeded.
Question 8
Which standard governs labeling and administration of telecommunications cabling?
A. NEC Article 800
B. NFPA 72
C. TIA/EIA-606
D. OSHA 1910
Answer: C
Explanation: TIA/EIA-606 sets standards for labeling, administration, and documentation
of telecommunications infrastructure to support maintenance and compliance.
Question 9
What type of test verifies correct conductor termination and polarity in telephone cabling?
A. Certification test
B. Megger test
C. Wire map test
D. Load test
