AR ES Electrical Sign Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
What is the minimum clearance required between overhead power lines and
the top of a sign?
A. 5 feet
B. 10 feet
C. 15 feet
D. 20 feet
Rationale: OSHA requires a minimum clearance of 15 feet between
overhead power lines and structures to prevent electrical hazards.
1. Which type of wire is commonly used for outdoor illuminated signs?
A. Aluminum
B. THHN copper
C. Romex
D. NM-B
Rationale: THHN copper wire is durable, heat-resistant, and suitable
for conduit installations in outdoor environments.
2. NEC Article 600 primarily covers:
A. Residential wiring
B. Sign and outline lighting
C. Fire alarm systems
D. Telecommunications wiring
Rationale: NEC 600 governs installation requirements for signs,
including electric signs and outline lighting.
,3. What is the standard voltage for most commercial neon signs?
A. 120V
B. 208V
C. 12,000–15,000V
D. 240V
Rationale: Neon signs require high-voltage transformers that can
output 12,000–15,000 volts for proper operation.
4. For wet location signage, which type of fixture rating is required?
A. Dry
B. Damp
C. Wet
D. Indoor only
Rationale: Wet-rated fixtures are designed to withstand exposure to
rain, snow, and moisture, ensuring safe operation outdoors.
5. What is the maximum distance a conductor can run without support in
a sign enclosure?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
Rationale: NEC specifies that conductors in raceways must be
supported at intervals not exceeding 36 inches to prevent mechanical
strain.
6. Which component converts AC to DC for LED signs?
A. Transformer
B. Switch
C. Driver
D. Rectifier breaker
Rationale: An LED driver converts AC mains voltage to a regulated
DC voltage suitable for LEDs.
7. Which grounding method is preferred for metal sign structures?
A. Floating ground
B. Isolated ground
C. Bonded ground to earth
D. No ground required
Rationale: Metal sign structures must be bonded to an earth ground
to prevent electric shock hazards.
, 8. What is the primary hazard when working near high-voltage sign
components?
A. Fire
B. Electric shock
C. Trip hazards
D. Chemical exposure
Rationale: High-voltage components pose a risk of electric shock if
proper safety procedures are not followed.
9. What type of circuit protection is required for a 120V LED sign?
A. GFCI only
B. Overcurrent protection (circuit breaker or fuse)
C. Surge suppressor only
D. None
Rationale: NEC requires overcurrent protection for all branch
circuits, including sign circuits, to prevent fire hazards.
10. Which NEC section covers the installation of transformers in
signs?
A. 110
B. 250
C. 600
D. 700
Rationale: NEC 600 provides requirements for transformers used in
electric signs and outline lighting.
11. What is the purpose of a fuse in a sign circuit?
A. Reduce voltage
B. Convert AC to DC
C. Protect against overcurrent
D. Act as a switch
Rationale: Fuses are designed to interrupt current flow when it
exceeds safe limits, protecting equipment and wiring.
12. Which insulation type is suitable for high-temperature sign
applications?
A. PVC
B. Fiberglass
C. Rubber
D. NM-B
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
What is the minimum clearance required between overhead power lines and
the top of a sign?
A. 5 feet
B. 10 feet
C. 15 feet
D. 20 feet
Rationale: OSHA requires a minimum clearance of 15 feet between
overhead power lines and structures to prevent electrical hazards.
1. Which type of wire is commonly used for outdoor illuminated signs?
A. Aluminum
B. THHN copper
C. Romex
D. NM-B
Rationale: THHN copper wire is durable, heat-resistant, and suitable
for conduit installations in outdoor environments.
2. NEC Article 600 primarily covers:
A. Residential wiring
B. Sign and outline lighting
C. Fire alarm systems
D. Telecommunications wiring
Rationale: NEC 600 governs installation requirements for signs,
including electric signs and outline lighting.
,3. What is the standard voltage for most commercial neon signs?
A. 120V
B. 208V
C. 12,000–15,000V
D. 240V
Rationale: Neon signs require high-voltage transformers that can
output 12,000–15,000 volts for proper operation.
4. For wet location signage, which type of fixture rating is required?
A. Dry
B. Damp
C. Wet
D. Indoor only
Rationale: Wet-rated fixtures are designed to withstand exposure to
rain, snow, and moisture, ensuring safe operation outdoors.
5. What is the maximum distance a conductor can run without support in
a sign enclosure?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
Rationale: NEC specifies that conductors in raceways must be
supported at intervals not exceeding 36 inches to prevent mechanical
strain.
6. Which component converts AC to DC for LED signs?
A. Transformer
B. Switch
C. Driver
D. Rectifier breaker
Rationale: An LED driver converts AC mains voltage to a regulated
DC voltage suitable for LEDs.
7. Which grounding method is preferred for metal sign structures?
A. Floating ground
B. Isolated ground
C. Bonded ground to earth
D. No ground required
Rationale: Metal sign structures must be bonded to an earth ground
to prevent electric shock hazards.
, 8. What is the primary hazard when working near high-voltage sign
components?
A. Fire
B. Electric shock
C. Trip hazards
D. Chemical exposure
Rationale: High-voltage components pose a risk of electric shock if
proper safety procedures are not followed.
9. What type of circuit protection is required for a 120V LED sign?
A. GFCI only
B. Overcurrent protection (circuit breaker or fuse)
C. Surge suppressor only
D. None
Rationale: NEC requires overcurrent protection for all branch
circuits, including sign circuits, to prevent fire hazards.
10. Which NEC section covers the installation of transformers in
signs?
A. 110
B. 250
C. 600
D. 700
Rationale: NEC 600 provides requirements for transformers used in
electric signs and outline lighting.
11. What is the purpose of a fuse in a sign circuit?
A. Reduce voltage
B. Convert AC to DC
C. Protect against overcurrent
D. Act as a switch
Rationale: Fuses are designed to interrupt current flow when it
exceeds safe limits, protecting equipment and wiring.
12. Which insulation type is suitable for high-temperature sign
applications?
A. PVC
B. Fiberglass
C. Rubber
D. NM-B
