Texas Maintenance Electrician Practice
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download Pdf
1. What is the maximum number of 12 AWG conductors allowed in a 4-
inch square box that is 2-1/8 inches deep?
a) 9
b) 12
c) 10
d) 14
Box fill calculations are based on conductor volume allowances; a 4"x4"x2-
1/8" box typically allows 21 in³. Ten 12 AWG conductors fit within this
volume.
2. According to the NEC, what is the minimum working space depth
required in front of exposed live parts operating at 480 volts?
a) 2 feet
b) 3 feet
c) 4 feet
d) 5 feet
NEC Table 110.26(A)(1) requires 3 feet of working space for systems up to
600 volts.
, 3. What is the color typically used for a grounded conductor in
residential wiring?
a) Red
b) Blue
c) White
d) Green
White or gray is the standard color for the grounded (neutral) conductor
per NEC Article 200.
4. A circuit with a 20-ampere breaker and #12 copper wire must be
protected by what maximum ampacity?
a) 25 amps
b) 20 amps
c) 15 amps
d) 30 amps
The ampacity of 12 AWG copper wire is 20 amps maximum under the NEC.
5. GFCI protection is required in which of the following locations?
a) Bedrooms
b) Bathrooms
c) Hallways
d) Dining rooms
NEC 210.8 requires GFCI protection in bathrooms due to moisture hazards.
6. Which of the following is the minimum burial depth for a direct burial
cable (Type UF) in residential areas?
a) 6 inches
b) 12 inches
c) 24 inches
d) 30 inches
, NEC Table 300.5 requires 24 inches of cover for UF cable in residential
circuits with GFCI protection.
7. Which of the following devices is required for overcurrent protection?
a) GFCI
b) Circuit breaker
c) Grounding electrode
d) Fuse puller
Circuit breakers are the primary overcurrent protection devices in modern
installations.
8. What is the minimum rating of a service disconnecting means for a
single-family dwelling?
a) 60 amps
b) 100 amps
c) 125 amps
d) 100 amps
NEC 230.79(C) requires a minimum 100-amp service for a single-family
dwelling.
9. What is the standard voltage between two hot conductors in a single-
phase 120/240V panel?
a) 120 volts
b) 240 volts
c) 208 volts
d) 277 volts
In a single-phase system, voltage between the two hot legs is 240V.
10. Which of the following grounding electrodes is most commonly
used in residential applications?
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download Pdf
1. What is the maximum number of 12 AWG conductors allowed in a 4-
inch square box that is 2-1/8 inches deep?
a) 9
b) 12
c) 10
d) 14
Box fill calculations are based on conductor volume allowances; a 4"x4"x2-
1/8" box typically allows 21 in³. Ten 12 AWG conductors fit within this
volume.
2. According to the NEC, what is the minimum working space depth
required in front of exposed live parts operating at 480 volts?
a) 2 feet
b) 3 feet
c) 4 feet
d) 5 feet
NEC Table 110.26(A)(1) requires 3 feet of working space for systems up to
600 volts.
, 3. What is the color typically used for a grounded conductor in
residential wiring?
a) Red
b) Blue
c) White
d) Green
White or gray is the standard color for the grounded (neutral) conductor
per NEC Article 200.
4. A circuit with a 20-ampere breaker and #12 copper wire must be
protected by what maximum ampacity?
a) 25 amps
b) 20 amps
c) 15 amps
d) 30 amps
The ampacity of 12 AWG copper wire is 20 amps maximum under the NEC.
5. GFCI protection is required in which of the following locations?
a) Bedrooms
b) Bathrooms
c) Hallways
d) Dining rooms
NEC 210.8 requires GFCI protection in bathrooms due to moisture hazards.
6. Which of the following is the minimum burial depth for a direct burial
cable (Type UF) in residential areas?
a) 6 inches
b) 12 inches
c) 24 inches
d) 30 inches
, NEC Table 300.5 requires 24 inches of cover for UF cable in residential
circuits with GFCI protection.
7. Which of the following devices is required for overcurrent protection?
a) GFCI
b) Circuit breaker
c) Grounding electrode
d) Fuse puller
Circuit breakers are the primary overcurrent protection devices in modern
installations.
8. What is the minimum rating of a service disconnecting means for a
single-family dwelling?
a) 60 amps
b) 100 amps
c) 125 amps
d) 100 amps
NEC 230.79(C) requires a minimum 100-amp service for a single-family
dwelling.
9. What is the standard voltage between two hot conductors in a single-
phase 120/240V panel?
a) 120 volts
b) 240 volts
c) 208 volts
d) 277 volts
In a single-phase system, voltage between the two hot legs is 240V.
10. Which of the following grounding electrodes is most commonly
used in residential applications?
