Texas Journeyman Electrician Licensing Exam
Test Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A |
Instant Download Pdf
1. What is the minimum size copper conductor permitted for a 20-amp branch
circuit?
12 AWG
12 AWG copper is the minimum size conductor for 20-amp branch circuits
as required by NEC 210.19.
2. What is the standard voltage drop recommendation for branch circuits to
ensure efficiency?
3%
The NEC recommends no more than a 3% voltage drop on branch circuits
to maintain efficiency and equipment protection.
3. When calculating box fill, how many cubic inches are allocated for each #12
conductor?
2.25 cubic inches
According to NEC 314.16, each #12 conductor counts as 2.25 cubic inches.
,4. What is the maximum number of disconnects permitted for a service under
the six-disconnect rule?
Six
The NEC allows up to six service disconnects per service installation.
5. A 120/240V single-phase dwelling service is rated at 200 amps. What is the
minimum size copper service conductor required?
2/0 AWG
Table 310.16 requires 2/0 AWG copper for a 200-amp residential service.
6. Which color is required for the grounded (neutral) conductor?
White or gray
The NEC requires the grounded conductor to be white or gray for
identification.
7. How deep must nonmetallic sheathed cable be buried directly in the
ground?
24 inches
NEC 300.5 requires NM cable to be buried at least 24 inches deep when
installed directly in the ground.
8. What is the minimum required clearance for overhead service conductors
above a residential driveway?
12 feet
NEC 230.24 requires at least 12 feet of clearance above residential
driveways.
9. Which type of conduit is not permitted in wet locations?
Electrical metallic tubing (EMT) without approved fittings
, EMT is allowed in wet locations only if fittings are listed for that use;
otherwise, it’s prohibited.
10.What is the maximum cord-and-plug connected load permitted on a 15-
amp receptacle?
12 amps
Per NEC 210.21, receptacles cannot be loaded more than 80% of their
rating for continuous loads.
11.How often must EMT be supported?
Every 10 feet
EMT must be supported at intervals not exceeding 10 feet and within 3
feet of each termination.
12.What is the maximum distance between supports for rigid metal conduit?
10 feet
NEC 344.30 states RMC must be supported at intervals not exceeding 10
feet.
13.What is the ampacity of #10 AWG copper THHN conductor at 75°C?
35 amps
According to NEC Table 310.16, #10 AWG copper THHN at 75°C has an
ampacity of 35 amps.
14.What is the minimum burial depth for direct-buried UF cable under a
residential lawn?
24 inches
Direct-buried UF cable must be at least 24 inches deep for residential
lawns per NEC 300.5.
Test Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A |
Instant Download Pdf
1. What is the minimum size copper conductor permitted for a 20-amp branch
circuit?
12 AWG
12 AWG copper is the minimum size conductor for 20-amp branch circuits
as required by NEC 210.19.
2. What is the standard voltage drop recommendation for branch circuits to
ensure efficiency?
3%
The NEC recommends no more than a 3% voltage drop on branch circuits
to maintain efficiency and equipment protection.
3. When calculating box fill, how many cubic inches are allocated for each #12
conductor?
2.25 cubic inches
According to NEC 314.16, each #12 conductor counts as 2.25 cubic inches.
,4. What is the maximum number of disconnects permitted for a service under
the six-disconnect rule?
Six
The NEC allows up to six service disconnects per service installation.
5. A 120/240V single-phase dwelling service is rated at 200 amps. What is the
minimum size copper service conductor required?
2/0 AWG
Table 310.16 requires 2/0 AWG copper for a 200-amp residential service.
6. Which color is required for the grounded (neutral) conductor?
White or gray
The NEC requires the grounded conductor to be white or gray for
identification.
7. How deep must nonmetallic sheathed cable be buried directly in the
ground?
24 inches
NEC 300.5 requires NM cable to be buried at least 24 inches deep when
installed directly in the ground.
8. What is the minimum required clearance for overhead service conductors
above a residential driveway?
12 feet
NEC 230.24 requires at least 12 feet of clearance above residential
driveways.
9. Which type of conduit is not permitted in wet locations?
Electrical metallic tubing (EMT) without approved fittings
, EMT is allowed in wet locations only if fittings are listed for that use;
otherwise, it’s prohibited.
10.What is the maximum cord-and-plug connected load permitted on a 15-
amp receptacle?
12 amps
Per NEC 210.21, receptacles cannot be loaded more than 80% of their
rating for continuous loads.
11.How often must EMT be supported?
Every 10 feet
EMT must be supported at intervals not exceeding 10 feet and within 3
feet of each termination.
12.What is the maximum distance between supports for rigid metal conduit?
10 feet
NEC 344.30 states RMC must be supported at intervals not exceeding 10
feet.
13.What is the ampacity of #10 AWG copper THHN conductor at 75°C?
35 amps
According to NEC Table 310.16, #10 AWG copper THHN at 75°C has an
ampacity of 35 amps.
14.What is the minimum burial depth for direct-buried UF cable under a
residential lawn?
24 inches
Direct-buried UF cable must be at least 24 inches deep for residential
lawns per NEC 300.5.
