CO Electrical Signs Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
QUESTIONS 1–50
1. Which NEC article primarily governs the installation of electric signs?
A. Article 220
B. Article 225
C. Article 600
D. Article 690
Rationale: Article 600 specifically addresses electric signs, outline lighting,
and associated equipment.
2. What is the minimum working space depth required in front of sign
disconnects under typical conditions?
A. 1 ft
B. 2 ft
C. 3 ft
D. 4 ft
Rationale: NEC requires 3 ft of clear working space for equipment
operating at ≤600V.
3. A sign disconnect must be located:
A. In a separate room
B. More than 20 ft away
,C. In sight from the sign
D. Adjacent to the service panel
Rationale: NEC 600 mandates the disconnect to be in sight and within 50
ft.
4. Maximum branch-circuit rating for supplying a sign is:
A. 10A
B. 15A
C. 20A
D. 30A
Rationale: Standard sign circuits are 20A unless otherwise specified.
5. Which conductor is required for all sign circuits?
A. Blue
B. Orange
C. Brown
D. Equipment grounding conductor
Rationale: All sign circuits must include an equipment grounding
conductor.
6. Field-installed skeleton neon tubing must comply with:
A. Article 430
B. Article 220
C. Article 500
D. Article 600 Part II
Rationale: Neon tubing rules appear in Part II of Article 600.
7. Which sign type requires a remote disconnect?
A. Window signs
B. Outline lighting
C. Roof-mounted illuminated signs
D. Portable signs
Rationale: Roof-mounted signs often require a remote, in-sight disconnect
location.
, 8. Fluorescent ballasts in electric signs must be:
A. Buried underground
B. Exposed
C. Accessible
D. Hidden behind walls permanently
Rationale: Ballasts must remain accessible for servicing.
9. When installing a sign outdoors, the disconnect must be:
A. Indoors
B. Below grade
C. Locked
D. Weatherproof
Rationale: Outdoor disconnects must be listed for wet locations.
10. A wet-location sign must use conductors rated:
A. 60°C
B. 75°C or higher
C. 40°C
D. 30°C
Rationale: Wet locations require 75°C-rated insulated conductors.
11. Minimum height for overhead sign branch-circuit conductors over
roads accessible to trucks?
A. 10 ft
B. 12 ft
C. 14 ft
D. 18 ft
Rationale: NEC requires 18 ft clearance for truck routes.
12. What is required on all electric signs to verify listing?
A. Serial sticker
B. Listing/label from a recognized testing lab
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
QUESTIONS 1–50
1. Which NEC article primarily governs the installation of electric signs?
A. Article 220
B. Article 225
C. Article 600
D. Article 690
Rationale: Article 600 specifically addresses electric signs, outline lighting,
and associated equipment.
2. What is the minimum working space depth required in front of sign
disconnects under typical conditions?
A. 1 ft
B. 2 ft
C. 3 ft
D. 4 ft
Rationale: NEC requires 3 ft of clear working space for equipment
operating at ≤600V.
3. A sign disconnect must be located:
A. In a separate room
B. More than 20 ft away
,C. In sight from the sign
D. Adjacent to the service panel
Rationale: NEC 600 mandates the disconnect to be in sight and within 50
ft.
4. Maximum branch-circuit rating for supplying a sign is:
A. 10A
B. 15A
C. 20A
D. 30A
Rationale: Standard sign circuits are 20A unless otherwise specified.
5. Which conductor is required for all sign circuits?
A. Blue
B. Orange
C. Brown
D. Equipment grounding conductor
Rationale: All sign circuits must include an equipment grounding
conductor.
6. Field-installed skeleton neon tubing must comply with:
A. Article 430
B. Article 220
C. Article 500
D. Article 600 Part II
Rationale: Neon tubing rules appear in Part II of Article 600.
7. Which sign type requires a remote disconnect?
A. Window signs
B. Outline lighting
C. Roof-mounted illuminated signs
D. Portable signs
Rationale: Roof-mounted signs often require a remote, in-sight disconnect
location.
, 8. Fluorescent ballasts in electric signs must be:
A. Buried underground
B. Exposed
C. Accessible
D. Hidden behind walls permanently
Rationale: Ballasts must remain accessible for servicing.
9. When installing a sign outdoors, the disconnect must be:
A. Indoors
B. Below grade
C. Locked
D. Weatherproof
Rationale: Outdoor disconnects must be listed for wet locations.
10. A wet-location sign must use conductors rated:
A. 60°C
B. 75°C or higher
C. 40°C
D. 30°C
Rationale: Wet locations require 75°C-rated insulated conductors.
11. Minimum height for overhead sign branch-circuit conductors over
roads accessible to trucks?
A. 10 ft
B. 12 ft
C. 14 ft
D. 18 ft
Rationale: NEC requires 18 ft clearance for truck routes.
12. What is required on all electric signs to verify listing?
A. Serial sticker
B. Listing/label from a recognized testing lab
