Texas Electrical Sign Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales
2025|2026 Q&A | Instant Download Pdf
1. What is the minimum working space required in front of live parts
operating at 480 volts?
A. 2 feet
B. 3 feet
C. 4 feet
D. 6 feet
Rationale: The NEC requires a minimum of 3 feet of clearance in front of
live electrical parts up to 600 volts.
2. What is the maximum voltage drop recommended for branch circuits
supplying signs?
A. 1%
B. 3%
C. 5%
D. 10%
Rationale: A maximum of 3% voltage drop is recommended for branch
circuits to ensure proper operation of signs.
3. Electrical signs must be installed in accordance with which article of the
NEC?
,A. Article 220
B. Article 600
C. Article 310
D. Article 400
Rationale: Article 600 of the NEC covers the installation of electric signs
and outline lighting.
4. What type of disconnect is required for an electrical sign?
A. Automatic
B. Manually operable disconnect within sight
C. Remote operated
D. None required
Rationale: A manual disconnecting means within sight of the sign is
required per NEC 600.6.
5. Which type of wire is approved for use in wet locations?
A. THHN
B. THWN
C. NM-B
D. UF-B
Rationale: THWN is rated for wet locations, while THHN is for dry or damp
locations.
6. What is the purpose of grounding an electrical sign?
A. Aesthetic purposes
B. Safety – to prevent shock hazard
C. Improves light quality
D. Increases brightness
Rationale: Grounding ensures electrical safety by preventing shock in case
of faults.
7. What is the NEC minimum wire size for a 20-amp sign circuit?
A. 10 AWG
, B. 12 AWG
C. 14 AWG
D. 16 AWG
Rationale: 12 AWG is the minimum size allowed for a 20-amp circuit per
NEC Table 310.16.
8. An outdoor electric sign must be marked with which of the following?
A. Date of installation
B. Electrical rating and manufacturer's name
C. UL rating only
D. Installer’s license number
Rationale: NEC 600.4 requires signs to be marked with electrical rating and
manufacturer information.
9. The branch circuit supplying a sign must be capable of handling how
much of the sign’s load?
A. 50%
B. 75%
C. 125%
D. 100%
Rationale: Circuits must be rated at 125% of the continuous load to allow
for safe operation.
10. Which of the following is NOT permitted to be used as a raceway for
sign wiring?
A. Garden hose
B. Rigid metal conduit
C. Liquidtight flexible conduit
D. Electrical metallic tubing
Rationale: Non-electrical items like garden hoses cannot be used as
raceways.
Questions And Correct Answers
(Verified Answers) Plus Rationales
2025|2026 Q&A | Instant Download Pdf
1. What is the minimum working space required in front of live parts
operating at 480 volts?
A. 2 feet
B. 3 feet
C. 4 feet
D. 6 feet
Rationale: The NEC requires a minimum of 3 feet of clearance in front of
live electrical parts up to 600 volts.
2. What is the maximum voltage drop recommended for branch circuits
supplying signs?
A. 1%
B. 3%
C. 5%
D. 10%
Rationale: A maximum of 3% voltage drop is recommended for branch
circuits to ensure proper operation of signs.
3. Electrical signs must be installed in accordance with which article of the
NEC?
,A. Article 220
B. Article 600
C. Article 310
D. Article 400
Rationale: Article 600 of the NEC covers the installation of electric signs
and outline lighting.
4. What type of disconnect is required for an electrical sign?
A. Automatic
B. Manually operable disconnect within sight
C. Remote operated
D. None required
Rationale: A manual disconnecting means within sight of the sign is
required per NEC 600.6.
5. Which type of wire is approved for use in wet locations?
A. THHN
B. THWN
C. NM-B
D. UF-B
Rationale: THWN is rated for wet locations, while THHN is for dry or damp
locations.
6. What is the purpose of grounding an electrical sign?
A. Aesthetic purposes
B. Safety – to prevent shock hazard
C. Improves light quality
D. Increases brightness
Rationale: Grounding ensures electrical safety by preventing shock in case
of faults.
7. What is the NEC minimum wire size for a 20-amp sign circuit?
A. 10 AWG
, B. 12 AWG
C. 14 AWG
D. 16 AWG
Rationale: 12 AWG is the minimum size allowed for a 20-amp circuit per
NEC Table 310.16.
8. An outdoor electric sign must be marked with which of the following?
A. Date of installation
B. Electrical rating and manufacturer's name
C. UL rating only
D. Installer’s license number
Rationale: NEC 600.4 requires signs to be marked with electrical rating and
manufacturer information.
9. The branch circuit supplying a sign must be capable of handling how
much of the sign’s load?
A. 50%
B. 75%
C. 125%
D. 100%
Rationale: Circuits must be rated at 125% of the continuous load to allow
for safe operation.
10. Which of the following is NOT permitted to be used as a raceway for
sign wiring?
A. Garden hose
B. Rigid metal conduit
C. Liquidtight flexible conduit
D. Electrical metallic tubing
Rationale: Non-electrical items like garden hoses cannot be used as
raceways.
