M ES-3 TEST (NEW MEXICO
N
LOW VOLTAGE JOURNEYMAN)
2025-2026 | Questions & Correct
Solutions | PSI Exam Prep |
Pass Guaranteed - A+ Graded
### Part A: Multiple Choice (Q1-45)
* *Q1 (Article 725 – Class 2 circuits):** What is the maximum power output for a Class 2
non-inherently limited power supply per NEC 2023 Chapter 9, Table 11(a) or 11(b)?
. 100 VA
A
B. 150 VA
C. 60 VA for inherently limited, 100 VA for non-inherently limited
D. 250 VA
* *[CORRECT]** C
*Rationale: NEC 2023 Chapter 9, Table 11(a) and 11(b) limit Class 2 power supplies to 60 VA for
inherently limited and 100 VA for non-inherently limited (30 V max for AC, 60 V max for DC).
Distractor A (100 VA) is only correct for non-inherently limited; Distractor B and D exceed code
limits.*
---
* *Q2 (Article 725 – Class 2/3 separation):** A Class 2 circuit is installed in the same raceway
with a 120V branch circuit. Which NEC requirement applies?
. Permitted if the Class 2 conductors are insulated for 600V
A
B. Prohibited under all circumstances
C. Permitted if a barrier separates the conductors
D. Permitted if the Class 2 circuit is in a metallic sheath
* *[CORRECT]** B
*Rationale: NEC 725.136(B) prohibits Class 2 and Class 3 circuits from being placed in any
cable, cable tray, compartment, enclosure, outlet box, device box, raceway, or similar fitting with
, onductors of electric light, power, or Class 1 circuits. Distractor A confuses this with 725.136(I)
c
which applies to cables in access floors; Distractors C and D describe exceptions that do not
exist for standard raceway installations.*
---
* *Q3 (Article 725 – Class 1 circuits):** What is the maximum voltage for a Class 1 power-limited
circuit?
. 30 volts
A
B. 50 volts
C. 600 volts
D. 1000 volts
* *[CORRECT]** A
*Rationale: NEC 725.121 limits Class 1 power-limited circuits to a maximum of 30 volts and
1000 VA. Distractor B (50V) is the threshold for shock hazard in other contexts; Distractor C
(600V) is the rating for standard power circuits; Distractor D exceeds all low-voltage limitations.*
---
* *Q4 (Article 725 – Class 2 power supply marking):** A power supply used as a Class 2 source
must be:
. Listed and marked as a Class 2 power source
A
B. Any UL-listed transformer
C. A dry-cell battery only
D. A current-limited impedance only
* *[CORRECT]** A
*Rationale: NEC 725.41(A) requires Class 2 power sources to be listed Class 2 or Class 3
transformers, listed Class 2 or Class 3 power supplies, or other listed equipment marked to
identify the Class 2 or Class 3 power source. Distractor B is incorrect because not all UL-listed
transformers are Class 2 rated; Distractors C and D describe only specific options, not the
general requirement.*
---
* *Q5 (Article 725 – Cable support):** Class 2 circuit cables shall be secured within ______ of
each box and at intervals not exceeding ______.
. 6 inches; 3 feet
A
B. 8 inches; 4.5 feet
C. 12 inches; 4.5 feet
, D. 18 inches; 6 feet
* *[CORRECT]** B
*Rationale: NEC 725.24 requires Class 2 circuit cables to be secured within 8 inches (200 mm)
of each box and at intervals not exceeding 4.5 feet (1.4 m). Distractor A understates both
requirements; Distractor C applies to standard NM cable support; Distractor D exceeds
permitted spacing.*
---
* *Q6 (Article 760 – Fire alarm power supplies):** A non-power-limited fire alarm circuit (NPLFA)
power supply shall have overcurrent protection rated not more than:
. 5 amperes
A
B. 7 amperes
C. 10 amperes
D. 15 amperes
* *[CORRECT]** B
*Rationale: NEC 760.41 requires NPLFA circuit conductors to be protected at not more than 7
amperes. Distractor A is too restrictive; Distractor C and D exceed the code maximum for
NPLFA circuits.*
---
* *Q7 (Article 760 – PLFA voltage):** Power-limited fire alarm (PLFA) circuits shall not exceed
what voltage?
. 24 volts
A
B. 30 volts
C. 42.4 volts
D. 50 volts
* *[CORRECT]** C
*Rationale: NEC 760.121 defines PLFA circuits as those powered by a source with a maximum
output of 100 VA at 30 volts (42.4 volts peak for AC). Distractor A is a common system voltage
but not the code maximum; Distractor B is the RMS value; Distractor D exceeds all PLFA limits.*
---
* *Q8 (Article 760 – Fire alarm battery standby):** A fire alarm system requires battery standby
capacity for:
A. 12 hours standby + 5 minutes alarm
N
LOW VOLTAGE JOURNEYMAN)
2025-2026 | Questions & Correct
Solutions | PSI Exam Prep |
Pass Guaranteed - A+ Graded
### Part A: Multiple Choice (Q1-45)
* *Q1 (Article 725 – Class 2 circuits):** What is the maximum power output for a Class 2
non-inherently limited power supply per NEC 2023 Chapter 9, Table 11(a) or 11(b)?
. 100 VA
A
B. 150 VA
C. 60 VA for inherently limited, 100 VA for non-inherently limited
D. 250 VA
* *[CORRECT]** C
*Rationale: NEC 2023 Chapter 9, Table 11(a) and 11(b) limit Class 2 power supplies to 60 VA for
inherently limited and 100 VA for non-inherently limited (30 V max for AC, 60 V max for DC).
Distractor A (100 VA) is only correct for non-inherently limited; Distractor B and D exceed code
limits.*
---
* *Q2 (Article 725 – Class 2/3 separation):** A Class 2 circuit is installed in the same raceway
with a 120V branch circuit. Which NEC requirement applies?
. Permitted if the Class 2 conductors are insulated for 600V
A
B. Prohibited under all circumstances
C. Permitted if a barrier separates the conductors
D. Permitted if the Class 2 circuit is in a metallic sheath
* *[CORRECT]** B
*Rationale: NEC 725.136(B) prohibits Class 2 and Class 3 circuits from being placed in any
cable, cable tray, compartment, enclosure, outlet box, device box, raceway, or similar fitting with
, onductors of electric light, power, or Class 1 circuits. Distractor A confuses this with 725.136(I)
c
which applies to cables in access floors; Distractors C and D describe exceptions that do not
exist for standard raceway installations.*
---
* *Q3 (Article 725 – Class 1 circuits):** What is the maximum voltage for a Class 1 power-limited
circuit?
. 30 volts
A
B. 50 volts
C. 600 volts
D. 1000 volts
* *[CORRECT]** A
*Rationale: NEC 725.121 limits Class 1 power-limited circuits to a maximum of 30 volts and
1000 VA. Distractor B (50V) is the threshold for shock hazard in other contexts; Distractor C
(600V) is the rating for standard power circuits; Distractor D exceeds all low-voltage limitations.*
---
* *Q4 (Article 725 – Class 2 power supply marking):** A power supply used as a Class 2 source
must be:
. Listed and marked as a Class 2 power source
A
B. Any UL-listed transformer
C. A dry-cell battery only
D. A current-limited impedance only
* *[CORRECT]** A
*Rationale: NEC 725.41(A) requires Class 2 power sources to be listed Class 2 or Class 3
transformers, listed Class 2 or Class 3 power supplies, or other listed equipment marked to
identify the Class 2 or Class 3 power source. Distractor B is incorrect because not all UL-listed
transformers are Class 2 rated; Distractors C and D describe only specific options, not the
general requirement.*
---
* *Q5 (Article 725 – Cable support):** Class 2 circuit cables shall be secured within ______ of
each box and at intervals not exceeding ______.
. 6 inches; 3 feet
A
B. 8 inches; 4.5 feet
C. 12 inches; 4.5 feet
, D. 18 inches; 6 feet
* *[CORRECT]** B
*Rationale: NEC 725.24 requires Class 2 circuit cables to be secured within 8 inches (200 mm)
of each box and at intervals not exceeding 4.5 feet (1.4 m). Distractor A understates both
requirements; Distractor C applies to standard NM cable support; Distractor D exceeds
permitted spacing.*
---
* *Q6 (Article 760 – Fire alarm power supplies):** A non-power-limited fire alarm circuit (NPLFA)
power supply shall have overcurrent protection rated not more than:
. 5 amperes
A
B. 7 amperes
C. 10 amperes
D. 15 amperes
* *[CORRECT]** B
*Rationale: NEC 760.41 requires NPLFA circuit conductors to be protected at not more than 7
amperes. Distractor A is too restrictive; Distractor C and D exceed the code maximum for
NPLFA circuits.*
---
* *Q7 (Article 760 – PLFA voltage):** Power-limited fire alarm (PLFA) circuits shall not exceed
what voltage?
. 24 volts
A
B. 30 volts
C. 42.4 volts
D. 50 volts
* *[CORRECT]** C
*Rationale: NEC 760.121 defines PLFA circuits as those powered by a source with a maximum
output of 100 VA at 30 volts (42.4 volts peak for AC). Distractor A is a common system voltage
but not the code maximum; Distractor B is the RMS value; Distractor D exceeds all PLFA limits.*
---
* *Q8 (Article 760 – Fire alarm battery standby):** A fire alarm system requires battery standby
capacity for:
A. 12 hours standby + 5 minutes alarm
