Exam Questions And Correct Answers

CA C45 Electrical Sign Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• Which component in a neon sign increases voltage to illuminate the

gas?

• Resistor
• Capacitor
• Transformer
• Ballast

Rationale: Neon signs require high voltage to ionize the gas inside

the tubes; transformers step up standard voltage to the required level.

• What is the primary purpose of grounding an electrical sign?
• Reduce energy consumption
• Improve lighting efficiency
• Prevent electric shock
• Enhance appearance

Rationale: Grounding provides a safe path for fault current,

protecting people from electric shock.

• For outdoor sign wiring, which wire type is recommended for direct

burial?

A. THHN

• Romex

C. UF-B

D. NM-B

Rationale: UF-B wire is rated for wet conditions and direct burial

without conduit. 1 / 3

• Which NEC article governs electrical sign installation?

A. 210

B. 310

C. 600

D. 725

Rationale: NEC Article 600 covers installation, wiring, grounding,

and safety requirements for electrical signs.

• When installing multiple signs on a single circuit, what must be

calculated?

• Sign color
• Mounting height
• Total current load
• Wire insulation

Rationale: Calculating total current load prevents overloading the

circuit and tripping breakers.

• What is the main hazard of high-voltage neon transformers?
• Low brightness
• Overheating bulbs
• Electric shock
• Short lifespan

Rationale: High-voltage transformers can deliver dangerous

currents; improper handling can result in electrocution.

• Which type of conduit is most resistant to corrosion in outdoor

environments?

A. EMT

• RMC uncoated
• PVC or coated metal
• Flexible metal

Rationale: PVC and coated metal resist moisture and corrosion,

making them suitable for outdoor use.

• For fluorescent signs, which device regulates current through the tubes?
• Transformer
• Switch
• Ballast
• Dimmer

Rationale: The ballast prevents excessive current that could damage

the tubes. 2 / 3

• What is the maximum voltage drop recommended for long sign wiring

runs?

• 1%
• 3%
• 5%

D. 10%

Rationale: A 5% voltage drop ensures proper operation without

excessive energy loss.

• What protective device is required for outdoor wet-location

signs?

• Arc-fault breaker
• Surge protector

C. GFCI

• Standard breaker

Rationale: GFCI protection interrupts current during faults,

preventing shock in wet conditions.

• What is the minimum pedestrian clearance for projecting signs?
• 6 feet
• 7 feet
• 8 feet
• 10 feet

Rationale: Most building codes require 8 feet clearance to prevent

pedestrian injury.

• Which mounting hardware is suitable for concrete or masonry

walls?

• Wood screws
• Sheet metal screws
• Expansion anchors
• Staples

Rationale: Expansion anchors provide secure attachment in masonry

where screws alone are insufficient.

• When connecting neon tubes in a sign, how should they be

wired?

• Series
• Series-parallel without load check
• Parallel with proper load calculation
• Direct to neutral
• / 3