New Mexico ES-3 Low Voltage Contractor EXAM QUESTIONS
AND CORRECT VERIFIED SOLUTIONS LATEST UPDATE THIS
YEAR – JUST RELEASED
10-Line Exam Coverage in Points Form
1. Scope of Work – Permitted to install and service low-voltage special systems (≤50 V)
including fire alarms, security systems, CATV, telecom/data cabling, sound/audio,
door/gate controls, temperature controls, and fiber optics; also includes trenching,
backfilling, boring, shoring, and compacting for these systems; excludes 120V or higher
circuits (requires EE-98/ER-1) .
2. General Low-Voltage Systems – NEC definitions for Class 1, 2, and 3 circuits (Article
725); power limitations and wiring methods; cable types for plenum (CMP), riser (CMR),
and general use (CM) spaces .
3. Fire Alarm Systems – NEC Article 760 requirements (PLFA/NPLFA); NFPA 72 (National
Fire Alarm and Signaling Code); FPL, FPLR, FPLP cable types; minimum standby battery
capacity (24 hours + 5 minutes alarm) .
4. Grounding & Bonding – NEC Article 250 requirements; electrode types and minimum
sizes; grounding conductor sizing for communications (14 AWG minimum); antenna
grounding (10 AWG copper minimum); grounding rod minimum length .
5. Communications & Data Cabling – NEC Articles 800 (Communications Circuits), 830
(Network-Powered Broadband), 820 (CATV); cable ratings (CMP, CMR, CMG, CMX); fiber
optics (conductive vs. nonconductive); minimum voltage rating for communications
cables (300 V); separation requirements from power conductors .
6. Security & Alarm Systems – System components; power supplies and standby batteries;
notification appliances; control panels; access control systems; integration with fire
alarm systems .
7. CATV & Antenna Systems – NEC Article 820; coaxial cable installations; grounding
requirements; separation from lightning protection systems (minimum 6 feet); direct
burial and overhead cabling requirements .
8. Occupancy & Environmental Classifications – Cable types for plenum spaces
(FPLP/CMP), riser spaces (FPLR/CMR), and general use; wiring methods in existing
raceways; direct burial requirements; above-suspended-ceiling installations .
9. Safety & Installation Standards – NEC 300.4 protection of conductors (1¼-inch from
stud edge); working space requirements (Illumination per 110.26[D]); burial depth for
conduit and warning tape; support methods for cables; bend radius requirements .
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10. Licensing & Business Law – Two years of verifiable experience required; pass both trade
exam (ES-3) and Business & Law exam; $10,000 consumer protection bond; qualifying
party requirements; 90-day grace period for renewal; no CE requirements .
MCQ Questions with Rationales
1. What is the maximum nominal voltage for circuits that an ES-3 contractor is permitted to
install?
A) 24 V
B) 30 V
C) 50 V
D) 120 V
Correct Answer: C
Rationale: The ES-3 classification is defined as "Low Voltage Special Systems (under 50 volts)."
Installations involving 120 V AC require an EE-98 or higher electrical classification .
2. Which New Mexico agency regulates low-voltage contractor licensing?
A) New Mexico Public Regulation Commission
B) New Mexico Construction Industries Division (CID)
C) New Mexico Department of Workforce Solutions
D) New Mexico Energy, Minerals and Natural Resources Department
Correct Answer: B
Rationale: The New Mexico Construction Industries Division (CID) under the Regulation and
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Licensing Department regulates all contractor licensing in the state, including low-voltage
electrical specialties such as the ES-3 classification .
3. How many years of verifiable experience are required to qualify for an ES-3 license?
A) 1 year
B) 2 years
C) 4 years
D) 6 years
Correct Answer: B
Rationale: The ES-3 license requires two years of foreman-level practical or related trade
experience. Accredited training may be substituted at a rate of one-half year of experience per
year of training, but cannot exceed half of the total requirement .
4. What is the minimum age requirement for obtaining an ES-3 contractor license in New
Mexico?
A) 16 years
B) 18 years
C) 21 years
D) 25 years
Correct Answer: B
Rationale: Applicants for any contractor license in New Mexico must be at least 18 years of age .
5. What is the passing score for the NM ES-3 trade exam?
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A) 60%
B) 65%
C) 70%
D) 75%
Correct Answer: C
Rationale: The ES-3 exam requires a passing score of 70% correct .
6. How many questions are on the ES-3 exam?
A) 50
B) 60
C) 80
D) 100
Correct Answer: A
Rationale: The ES-3 Low Voltage exam consists of 50 scored questions .
7. What is the time limit for completing the ES-3 exam?
A) 90 minutes
B) 120 minutes
C) 145 minutes
D) 180 minutes