Texas Residential Wireman License
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1. What is the minimum size copper grounding electrode conductor for a
100-amp residential service?
A. 10 AWG
B. 8 AWG
C. 6 AWG
D. 4 AWG
*According to NEC Table 250.66, a 100-amp service requires a
minimum of 6 AWG copper grounding electrode conductor.
2. Which of the following is the standard voltage for residential
receptacles in Texas?
A. 120/240V
B. 120V
,C. 277V
D. 480V
*Standard residential receptacles operate at 120 volts in a typical U.S.
home including Texas.
3. A residential bathroom requires at least how many 20-amp circuits?
A. None
B. One
C. Two
D. Depends on square footage
*Per NEC 210.11(C)(3), at least one 20-amp circuit is required for
bathroom receptacle outlets.
4. How far must non-metallic sheathed cable (NM cable) be supported
from a box?
A. 6 inches
B. 8 inches
C. 10 inches
D. 12 inches
*NEC 334.30 requires NM cable to be secured within 8 inches of a box.
5. What is the minimum burial depth for direct-burial cable without
conduit in residential applications?
A. 6 inches
B. 12 inches
,C. 18 inches
D. 24 inches
*Per NEC Table 300.5, direct-burial cable must be buried at least 24
inches deep.
6. Which color is typically used for the ground wire in NM cable?
A. Red
B. Black
C. Green or bare
D. White
*Ground wires are either green or bare copper, per NEC Article 250.
7. What is the required ampacity of a circuit for a residential kitchen
small appliance branch?
A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
*NEC 210.11(C)(1) requires at least two 20-amp small appliance
circuits in the kitchen.
8. In Texas, a Residential Wireman license allows the licensee to work:
A. On commercial buildings under 3 stories
B. Only on residential dwellings up to four units
, C. On industrial job sites
D. On high-voltage systems
*The Residential Wireman license limits work to residential settings
only.
9. How often must NM cable be supported along its length?
A. Every 4.5 feet
B. Every 6 feet
C. Every 8 feet
D. Every 4.5 feet and within 12 inches of a box
*NEC 334.30 mandates support within 12 inches of boxes and every
4.5 feet.
10. The minimum working space in front of electrical panels is:
A. 24 inches
B. 36 inches
C. 30 inches
D. 48 inches
*NEC 110.26(A) specifies a minimum of 36 inches working clearance in
front of panels.
11. What is the maximum height of a residential panelboard breaker
handle?
A. 60 inches
B. 72 inches
Practice Exam Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
Download Pdf
1. What is the minimum size copper grounding electrode conductor for a
100-amp residential service?
A. 10 AWG
B. 8 AWG
C. 6 AWG
D. 4 AWG
*According to NEC Table 250.66, a 100-amp service requires a
minimum of 6 AWG copper grounding electrode conductor.
2. Which of the following is the standard voltage for residential
receptacles in Texas?
A. 120/240V
B. 120V
,C. 277V
D. 480V
*Standard residential receptacles operate at 120 volts in a typical U.S.
home including Texas.
3. A residential bathroom requires at least how many 20-amp circuits?
A. None
B. One
C. Two
D. Depends on square footage
*Per NEC 210.11(C)(3), at least one 20-amp circuit is required for
bathroom receptacle outlets.
4. How far must non-metallic sheathed cable (NM cable) be supported
from a box?
A. 6 inches
B. 8 inches
C. 10 inches
D. 12 inches
*NEC 334.30 requires NM cable to be secured within 8 inches of a box.
5. What is the minimum burial depth for direct-burial cable without
conduit in residential applications?
A. 6 inches
B. 12 inches
,C. 18 inches
D. 24 inches
*Per NEC Table 300.5, direct-burial cable must be buried at least 24
inches deep.
6. Which color is typically used for the ground wire in NM cable?
A. Red
B. Black
C. Green or bare
D. White
*Ground wires are either green or bare copper, per NEC Article 250.
7. What is the required ampacity of a circuit for a residential kitchen
small appliance branch?
A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
*NEC 210.11(C)(1) requires at least two 20-amp small appliance
circuits in the kitchen.
8. In Texas, a Residential Wireman license allows the licensee to work:
A. On commercial buildings under 3 stories
B. Only on residential dwellings up to four units
, C. On industrial job sites
D. On high-voltage systems
*The Residential Wireman license limits work to residential settings
only.
9. How often must NM cable be supported along its length?
A. Every 4.5 feet
B. Every 6 feet
C. Every 8 feet
D. Every 4.5 feet and within 12 inches of a box
*NEC 334.30 mandates support within 12 inches of boxes and every
4.5 feet.
10. The minimum working space in front of electrical panels is:
A. 24 inches
B. 36 inches
C. 30 inches
D. 48 inches
*NEC 110.26(A) specifies a minimum of 36 inches working clearance in
front of panels.
11. What is the maximum height of a residential panelboard breaker
handle?
A. 60 inches
B. 72 inches
