NEW MEXICO LOW VOLTAGE JOURNEYMAN ES3J
– COMPLETE TESTBANK
Verified Q&A | 2026/2027 | NEC 2020 | NFPA 72
EXAM OVERVIEW
The New Mexico ES-3J (Journeyman Low Voltage Special Systems) exam is
administered by PSI, is open-book with the NEC, contains 50 questions,
and allows 120 minutes. The license scope is limited to systems operating
at 50 volts or less (both AC and DC).
Key Code References:
• NEC 2020 – Primary code reference
• NFPA 72 – Fire Alarm and Signaling Code
• NMAC 14.10.4 – New Mexico State Amendments
• NEC 300.34 – Cable Installation in Plenums
• NEC 725 – Class 1, 2, and 3 Remote-Control Circuits
• NEC 760 – Fire Alarm Systems
• NEC 770 – Optical Fiber Cables
• NEC 800 – Communication Circuits
QUESTIONS 1-25
,1. What is the NFPA code that refers to household firefighting
equipment?
A) NFPA 70
B) NFPA 72
C) NFPA 101
D) NFPA 13
Correct Answer: B) NFPA 72
Rationale: NFPA 72 is the National Fire Alarm and Signaling Code, which
governs fire alarm systems and related signaling equipment. This is the
primary standard referenced for fire alarm installations in New Mexico.
2. According to New Mexico state rules, what is the maximum voltage
scope for an ES-3J licensee?
A) 120V
B) 240V
C) 50V or less
D) 600V
Correct Answer: C) 50V or less
Rationale: The ES-3J license in New Mexico restricts the scope to systems
operating at 50 volts or less (both AC and DC). This limitation ensures safety
and specialization for low-voltage work.
3. What is the correct minimum conduit size for pulling three 18-AWG
PLTC cables?
,A) ½-inch EMT
B) ¾-inch EMT
C) 1-inch EMT
D) ¼-inch
Correct Answer: A) ½-inch EMT
Rationale: ½-inch EMT conduit provides sufficient space for three 18-AWG
PLTC cables while maintaining proper fill ratios. Conduit fill calculations must
ensure cables do not exceed the maximum allowable fill percentage.
4. A low-voltage 48 V DC power-over-Ethernet (PoE) injector supplies
15.4 W per port. What is the maximum current on each port?
A) 0.32 A
B) 0.45 A
C) 0.75 A
D) 1.0 A
Correct Answer: A) 0.32 A
Rationale: Using Ohm's Law (I = P ÷ V), the current is calculated as 15.4 W
divided by 48 V, which equals approximately 0.32 A. This calculation is
fundamental for sizing PoE power supplies.
5. What is the minimum required clearance between a receiving
antenna and a 250-volt line that is not insulated?
A) 1 foot
B) 2 Feet
C) 3 feet
D) 4 feet
, Correct Answer: B) 2 Feet
Rationale: NEC 810.13 requires a minimum clearance of 2 feet between a
receiving antenna and a 250-volt uninsulated line to prevent arcing and
ensure safety.
6. What is the function of a green wire in a manufactured home?
A) Bond to the service equipment
B) Grounding connection
C) Service ground
D) Connected to the grounding bus
Correct Answer: B) Grounding connection
Rationale: Green conductors are used specifically for grounding connections
in manufactured homes. NEC 550.16 requires the grounding bus to be
connected through the green insulated conductor in the supply cord or feeder
wiring.
7. What is the maximum number of supervisory switches permitted to
be connected to actuate a single transmitter?
A) 10
B) 15
C) 20
D) 25
Correct Answer: C) 20
Rationale: The maximum number of supervisory switches permitted to be
connected to actuate a single transmitter is 20 per NFPA 72 requirements.
– COMPLETE TESTBANK
Verified Q&A | 2026/2027 | NEC 2020 | NFPA 72
EXAM OVERVIEW
The New Mexico ES-3J (Journeyman Low Voltage Special Systems) exam is
administered by PSI, is open-book with the NEC, contains 50 questions,
and allows 120 minutes. The license scope is limited to systems operating
at 50 volts or less (both AC and DC).
Key Code References:
• NEC 2020 – Primary code reference
• NFPA 72 – Fire Alarm and Signaling Code
• NMAC 14.10.4 – New Mexico State Amendments
• NEC 300.34 – Cable Installation in Plenums
• NEC 725 – Class 1, 2, and 3 Remote-Control Circuits
• NEC 760 – Fire Alarm Systems
• NEC 770 – Optical Fiber Cables
• NEC 800 – Communication Circuits
QUESTIONS 1-25
,1. What is the NFPA code that refers to household firefighting
equipment?
A) NFPA 70
B) NFPA 72
C) NFPA 101
D) NFPA 13
Correct Answer: B) NFPA 72
Rationale: NFPA 72 is the National Fire Alarm and Signaling Code, which
governs fire alarm systems and related signaling equipment. This is the
primary standard referenced for fire alarm installations in New Mexico.
2. According to New Mexico state rules, what is the maximum voltage
scope for an ES-3J licensee?
A) 120V
B) 240V
C) 50V or less
D) 600V
Correct Answer: C) 50V or less
Rationale: The ES-3J license in New Mexico restricts the scope to systems
operating at 50 volts or less (both AC and DC). This limitation ensures safety
and specialization for low-voltage work.
3. What is the correct minimum conduit size for pulling three 18-AWG
PLTC cables?
,A) ½-inch EMT
B) ¾-inch EMT
C) 1-inch EMT
D) ¼-inch
Correct Answer: A) ½-inch EMT
Rationale: ½-inch EMT conduit provides sufficient space for three 18-AWG
PLTC cables while maintaining proper fill ratios. Conduit fill calculations must
ensure cables do not exceed the maximum allowable fill percentage.
4. A low-voltage 48 V DC power-over-Ethernet (PoE) injector supplies
15.4 W per port. What is the maximum current on each port?
A) 0.32 A
B) 0.45 A
C) 0.75 A
D) 1.0 A
Correct Answer: A) 0.32 A
Rationale: Using Ohm's Law (I = P ÷ V), the current is calculated as 15.4 W
divided by 48 V, which equals approximately 0.32 A. This calculation is
fundamental for sizing PoE power supplies.
5. What is the minimum required clearance between a receiving
antenna and a 250-volt line that is not insulated?
A) 1 foot
B) 2 Feet
C) 3 feet
D) 4 feet
, Correct Answer: B) 2 Feet
Rationale: NEC 810.13 requires a minimum clearance of 2 feet between a
receiving antenna and a 250-volt uninsulated line to prevent arcing and
ensure safety.
6. What is the function of a green wire in a manufactured home?
A) Bond to the service equipment
B) Grounding connection
C) Service ground
D) Connected to the grounding bus
Correct Answer: B) Grounding connection
Rationale: Green conductors are used specifically for grounding connections
in manufactured homes. NEC 550.16 requires the grounding bus to be
connected through the green insulated conductor in the supply cord or feeder
wiring.
7. What is the maximum number of supervisory switches permitted to
be connected to actuate a single transmitter?
A) 10
B) 15
C) 20
D) 25
Correct Answer: C) 20
Rationale: The maximum number of supervisory switches permitted to be
connected to actuate a single transmitter is 20 per NFPA 72 requirements.
