Texas Master Electrician Practice Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download Pdf
1. What is the minimum service conductor size for a 200-amp residential
service using copper conductors?
A. 2 AWG
B. 1 AWG
C. 2/0 AWG
D. 3/0 AWG
2/0 AWG copper is the minimum size for 200-amp residential service per
NEC Table 310.12.
2. When installing EMT in a wet location, what must be used?
A. Compression fittings
B. Watertight compression fittings
C. Set screw fittings
D. No fittings are needed
In wet locations, EMT must be installed with watertight compression
fittings to prevent moisture intrusion.
, 3. The maximum number of 12 AWG THHN conductors allowed in a 3/4-
inch EMT is:
A. 10
B. 14
C. 16
D. 20
According to NEC Annex C, Table C.1, up to 20 12 AWG THHN conductors
are allowed in 3/4” EMT.
4. A feeder supplies a 120/240V single-phase dwelling. What is the
demand load for a 12 kW range per NEC Table 220.55 for one unit?
A. 12 kW
B. 8 kW
C. 10 kW
D. 6 kW
Table 220.55 Note 1 allows a demand factor of 8 kW for one range rated
over 12 kW but not over 27 kW.
5. What is the maximum overcurrent protection for #12 copper wire?
A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
NEC 240.4(D)(5) limits #12 copper conductors to 20 amps maximum.
6. In a commercial building, how far from the floor must receptacles in
office spaces be mounted?
A. 6 inches
B. 12 inches
C. No specific height required
, D. 18 inches
There is no NEC requirement for the mounting height of general-use
receptacles in commercial spaces.
7. Which type of conductor insulation is rated for use in wet and dry
locations and is sunlight resistant?
A. THHN
B. THWN-2
C. XHHN
D. NM-B
THWN-2 is rated for wet/dry locations and is commonly sunlight resistant.
8. How many 20-amp circuits are required for the small appliance branch
circuits in a dwelling?
A. One
B. Two
C. Three
D. None
NEC 210.11(C)(1) requires at least two 20-amp small appliance branch
circuits for kitchens and dining areas.
9. The minimum burial depth for a direct burial cable (UF) under a
residential driveway is:
A. 12 inches
B. 18 inches
C. 24 inches
D. 6 inches
NEC Table 300.5 requires 18 inches minimum burial for UF cable under a
driveway.
Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download Pdf
1. What is the minimum service conductor size for a 200-amp residential
service using copper conductors?
A. 2 AWG
B. 1 AWG
C. 2/0 AWG
D. 3/0 AWG
2/0 AWG copper is the minimum size for 200-amp residential service per
NEC Table 310.12.
2. When installing EMT in a wet location, what must be used?
A. Compression fittings
B. Watertight compression fittings
C. Set screw fittings
D. No fittings are needed
In wet locations, EMT must be installed with watertight compression
fittings to prevent moisture intrusion.
, 3. The maximum number of 12 AWG THHN conductors allowed in a 3/4-
inch EMT is:
A. 10
B. 14
C. 16
D. 20
According to NEC Annex C, Table C.1, up to 20 12 AWG THHN conductors
are allowed in 3/4” EMT.
4. A feeder supplies a 120/240V single-phase dwelling. What is the
demand load for a 12 kW range per NEC Table 220.55 for one unit?
A. 12 kW
B. 8 kW
C. 10 kW
D. 6 kW
Table 220.55 Note 1 allows a demand factor of 8 kW for one range rated
over 12 kW but not over 27 kW.
5. What is the maximum overcurrent protection for #12 copper wire?
A. 15 amps
B. 20 amps
C. 25 amps
D. 30 amps
NEC 240.4(D)(5) limits #12 copper conductors to 20 amps maximum.
6. In a commercial building, how far from the floor must receptacles in
office spaces be mounted?
A. 6 inches
B. 12 inches
C. No specific height required
, D. 18 inches
There is no NEC requirement for the mounting height of general-use
receptacles in commercial spaces.
7. Which type of conductor insulation is rated for use in wet and dry
locations and is sunlight resistant?
A. THHN
B. THWN-2
C. XHHN
D. NM-B
THWN-2 is rated for wet/dry locations and is commonly sunlight resistant.
8. How many 20-amp circuits are required for the small appliance branch
circuits in a dwelling?
A. One
B. Two
C. Three
D. None
NEC 210.11(C)(1) requires at least two 20-amp small appliance branch
circuits for kitchens and dining areas.
9. The minimum burial depth for a direct burial cable (UF) under a
residential driveway is:
A. 12 inches
B. 18 inches
C. 24 inches
D. 6 inches
NEC Table 300.5 requires 18 inches minimum burial for UF cable under a
driveway.
