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100+ Free NM CID ES-7 Practice Questions

Prepare for the New Mexico CID ES-7 Telephone Communication Systems and Telephone Interconnect Systems Examination exam with instant access — no signup required.

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2026 Statistics

Key Facts: NM CID ES-7 Exam

75%

Passing Score

PSI NM Contractor Bulletin 4/3/2026

50 Q

Official Exam Questions

PSI NM Contractor Bulletin 4/3/2026

145 min

Time Allowed

PSI NM Contractor Bulletin 4/3/2026

USD 68.88

PSI Exam Fee

PSI NM Contractor Bulletin 4/3/2026

NM CID ES-7 is a 50-question PSI exam on telephone communication and interconnect systems, 75% pass, 145 minutes, USD 68.88 (bulletin 4/3/2026).

Sample NM CID ES-7 Practice Questions

Try these sample questions to test your NM CID ES-7 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under NEC 2020 800.100(A)(3), what is the minimum size of the copper bonding conductor or grounding electrode conductor for a communications cable primary protector?
A.18 AWG
B.14 AWG
C.10 AWG
D.6 AWG
Explanation: NEC 800.100(A)(3) requires the bonding conductor or grounding electrode conductor to be not smaller than 14 AWG. It must also have a current-carrying capacity at least equal to that of the grounded metallic sheath member or protected conductor. The conductor is not required to be larger than 6 AWG.
2NEC 800.100(A)(3) states that the communications bonding conductor or grounding electrode conductor is not required to be larger than which size?
A.14 AWG
B.10 AWG
C.8 AWG
D.6 AWG
Explanation: NEC 800.100(A)(3) sets a 14 AWG minimum and then states the bonding or grounding electrode conductor shall not be required to exceed 6 AWG. That cap exists because the protector and cable shield do not need a larger electrode conductor for surge equalization. Use 6 AWG when the Code separately requires a bonding jumper between electrodes.
3In a one- or two-family dwelling, NEC 800.100(A)(4) limits the communications bonding conductor or grounding electrode conductor to a maximum length of:
A.6 feet
B.10 feet
C.20 feet
D.30 feet
Explanation: NEC 800.100(A)(4) requires the conductor to be as short as practicable. In one- and two-family dwellings it shall not exceed 20 feet. A long run adds inductance that leaves a dangerous voltage between the telephone protector ground and the power electrode during a surge. If 20 feet cannot be met, install a local electrode and bond it to the power grounding electrode system with at least 6 AWG copper.
4Where a communications grounding electrode is separate from the building power grounding electrode system, NEC 800.100(D) requires the bonding jumper between those electrodes to be not smaller than:
A.14 AWG copper
B.12 AWG copper
C.8 AWG copper
D.6 AWG copper
Explanation: NEC 800.100(D) requires a bonding jumper not smaller than 6 AWG copper (or equivalent) between the communications electrode and the power grounding electrode system. That bond keeps the telephone protector and the service equipment near the same potential during a lightning or power-cross event. Leaving two electrodes unbonded can put surge voltage across station equipment.
5If a building has no intersystem bonding termination or other grounding means listed in NEC 800.100(B), a communications-circuit ground rod used under 800.100(B)(3) shall be not less than:
A.4 feet long and 3/8 inch in diameter
B.5 feet long and 1/2 inch in diameter
C.8 feet long and 5/8 inch in diameter
D.10 feet long and 3/4 inch in diameter
Explanation: NEC 800.100(B)(3) permits a ground rod or pipe not less than 5 feet long and 1/2 inch in diameter when the structure has no IBT or other listed grounding means. Drive it into permanently damp earth where practicable, keep it at least 6 feet from electrodes of other systems, and still bond it to the power electrode system with 6 AWG if a power electrode exists. Do not confuse this communications-only rod with the 8-foot rod required by Article 250 for power electrodes.
6If the communications bonding conductor is run in a metal raceway, NEC 800.100 requires which bonding practice?
A.Bond only the load end of the raceway
B.Bond only the electrode end of the raceway
C.Bond both ends of the metal raceway to the contained conductor or to the same terminal or electrode
D.Leave the raceway isolated so it does not create a parallel ground path
Explanation: NEC 800.100(A) requires the bonding or grounding electrode conductor to be protected from physical damage. If it is installed in a metal raceway, both ends of that raceway must be bonded to the contained conductor or connected to the same terminal or electrode. Bonding only one end leaves the raceway able to choke the surge and raise the protector voltage. Isolation of the raceway is the opposite of what the Code requires.
7Where an intersystem bonding termination (IBT) is provided at the service, the preferred termination for a telephone primary-protector bonding conductor is:
A.A driven rod at the far corner of the building, left unbonded to the service
B.The intersystem bonding termination required by NEC 250.94
C.The nearest interior cold-water pipe more than 5 feet from its entrance
D.An isolated equipment-grounding bus in the data rack only
Explanation: NEC 250.94 requires an intersystem bonding termination at the service equipment, and 800.100(B) lists that IBT as an acceptable electrode connection. Terminating telephone, CATV, and power grounds at one accessible point equalizes surge potential. An isolated data-rack ground or a remote unbonded rod creates the very potential difference the protector is meant to prevent.
8A listed primary protector on an incoming telephone circuit shall be located:
A.As close as practicable to the point of entrance
B.At the farthest station jack so it protects only that instrument
C.Only at the serving central office, never on the premises
D.Anywhere on the premises as long as the conductor is 14 AWG
Explanation: NEC 800.90 / 805.90 require a listed primary protector on each communications circuit exposed to lightning or accidental contact with power, installed as close as practicable to the point of entrance. That placement keeps the unprotected OSP pair from running deep into the building. Protector grounding must still follow 800.100 with the shortest, straightest conductor practicable.
9A mobile home has no service equipment or grounded disconnecting means in sight from and within 30 feet of its exterior wall. Under NEC 800.106(B), the primary-protector grounding terminal shall be bonded to the mobile-home metal frame or available grounding terminal with copper not smaller than:
A.14 AWG
B.12 AWG
C.8 AWG
D.6 AWG
Explanation: NEC 800.106(A) requires a local communications electrode when the mobile-home service or grounded disconnect is not in sight and within 30 feet. Under those same conditions, 800.106(B) requires a copper bond not smaller than 12 AWG from the protector grounding terminal or electrode to the mobile-home metal frame or available grounding terminal. That bond equalizes the telephone ground and the coach frame so a surge does not appear across station equipment.
10For NEC Chapter 8, the point of entrance of a communications cable is the point within a building at which the cable emerges from an exterior wall, from a concrete floor slab, or from which of the following grounded raceways?
A.Electrical nonmetallic tubing (ENT) or PVC conduit of any length
B.Rigid metal conduit (RMC) or intermediate metal conduit (IMC) connected by a grounding conductor to an electrode
C.A nonmetallic innerduct laid on the floor
D.A flexible cord whip
Explanation: NEC Article 800 defines point of entrance as the point within a building at which the cable emerges from an external wall, a concrete floor slab, or from rigid metal conduit or intermediate metal conduit that is connected by a grounding conductor to an electrode. Grounded RMC or IMC therefore moves the point of entrance — and the start of the 50-foot unlisted-cable clock — to where the cable leaves that metal raceway. ENT, PVC, and innerduct do not relocate the point of entrance.

About the NM CID ES-7 Exam

The New Mexico CID ES-7 examination covers telephone communication systems and telephone interconnect systems. The official open-book PSI exam has 50 scored questions, a 75% passing standard (38 points), and 145 minutes allowed. Allowed references are NEC 2020, New Mexico Electrical Code NMAC 14.10.4 (2020), and NESC C2 (2007). This official ES-7 identity is distinct from the older generic nm-low-voltage-contractor practice route. PSI lists the fee at USD 68.88 (bulletin updated 4/3/2026). This English-language MCQ bank is a study aid, not an official PSI form.

Questions

50 scored questions

Time Limit

145 minutes

Passing Score

75% (38 of 50 points)

Exam Fee

USD 68.88 (PSI Services LLC (for New Mexico Construction Industries Division))

NM CID ES-7 Exam Content Outline

10%

Grounding and Bonding

Communications grounding (5 items)

10%

Conductors

Communications conductors (5 items)

4%

Special Occupancies and Equipment

Special occupancies (2 items)

10%

General Electrical Knowledge

General electrical knowledge (5 items)

10%

Communication Systems

Communication systems (5 items)

10%

Outside Cabling

Outside plant cabling (5 items)

4%

Cable Transmission and Reception

Transmission and reception (2 items)

4%

Poles

Poles and supports (2 items)

10%

Inside Cabling

Inside cabling (5 items)

10%

Network/Data

Network and data (5 items)

4%

Switching

Switching (2 items)

6%

Telephones

Telephone instruments (3 items)

8%

Underground Cabling

Underground cabling (4 items)

How to Pass the NM CID ES-7 Exam

What You Need to Know

  • Passing score: 75% (38 of 50 points)
  • Exam length: 50 questions
  • Time limit: 145 minutes
  • Exam fee: USD 68.88

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NM CID ES-7 Study Tips from Top Performers

1Study NEC Chapter 8 communications circuits with NESC C2-2007 outside-plant clearances
2This official ES-7 bank is not the generic nm-low-voltage-contractor route
3This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the NM ES-7 exam?

The official PSI examination has 50 scored questions. Passing is 75% (38 points) within 145 minutes (bulletin updated 4/3/2026).