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Question 1. Which NEC article defines the term “sign” for the purposes of electrical installations? A) Article 100 B) Article 210 C) Article 600 D) Article 725 Answer: C Explanation: Article 600 of the NEC is specifically titled “Electric Signs and Outline Lighting” and provides the definitions, scope, and requirements for sign installations.
Question 2. Under Texas law, which license is required to install a permanent illuminated billboard? A) Master Electrician B) Journeyman Sign Electrician C) Master Sign Electrician D) Electrical Sign Contractor Answer: D Explanation: An Electrical Sign Contractor holds the authority to perform permanent sign installations, including illuminated billboards, as defined by the Texas Electrical Safety and Licensing Act.
Question 3. What is the minimum ampacity of a feeder conductor supplying a sign that is rated at 150 VA at 120 V? A) 10 A B) 12 A C) 15 A D) 20 A
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Answer: B Explanation: 150 VA ÷ 120 V = 1.25 A. NEC Table 310-16 requires the next standard conductor size; a 12-AWG copper conductor (20 A) is the smallest that meets the 125 % load rule (1.25 A × 125 % = 1.56 A). The next lower standard size (14-AWG, 15 A) also satisfies the requirement, but the code mandates using the smallest conductor that does not exceed the ampacity; 14-AWG is acceptable, however many jurisdictions require at least 12-AWG for sign feeders. The safest answer is 12 A (14-AWG) which meets the 125 % rule.
Question 4. According to NEC 2023, what is the maximum voltage allowed for low-voltage LED sign power supplies? A) 30 V DC B) 50 V DC C) 100 V DC D) 150 V DC Answer: B Explanation: NEC limits low-voltage circuits to 30 V DC for Class 2 circuits, but sign power supplies may be up to 50 V DC under Article 600.2(A) for LED signs.
Question 5. Which of the following grounding electrodes is NOT permitted for a sign’s grounding electrode system? A) Ground rod driven 8 ft deep B) Concrete-encased electrode (Ufer) C) Metal water pipe located within 5 ft of the sign D) Aluminum stake driven 4 ft deep Answer: D
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Question 8. What is the required rating for a disconnecting means for a sign circuit that is protected by a 20-A breaker? A) 15 A B) 20 A C) 25 A D) 30 A Answer: B Explanation: The disconnect must be rated at least equal to the overcurrent protective device. Therefore, a 20-A disconnect is required.
Question 9. Which NEC article governs the installation of temporary wiring for a sign being erected at a construction site? A) Article 590 B) Article 300 C) Article 410 D) Article 625 Answer: A Explanation: Article 590 covers temporary wiring, including temporary power for signs under construction.
Question 10. Under OSHA 29 CFR 1926.501, what is the minimum personal fall arrest system (PFAS) height for a worker installing a sign on a 25-ft scaffold? A) 4 ft B) 6 ft C) 8 ft D) 10 ft
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Answer: B Explanation: OSHA requires a PFAS when working at heights of 6 ft or more above a lower level.
Question 11. A sign’s power supply is installed in a weatherproof enclosure rated NEMA 4X. Which of the following is true? A) The enclosure must be painted annually. B) The enclosure must be vented to the outside. C) The enclosure is protected against corrosion and water ingress. D) The enclosure cannot be used in hazardous locations. Answer: C Explanation: NEMA 4X provides protection against corrosion, rain, sleet, and hose-directed water.
Question 12. When calculating voltage drop for a 500-ft run of 12-AWG copper conductors feeding a sign, which factor is NOT considered? A) Load current B) Conductor resistance per foot C) Ambient temperature correction factor D) Number of sign colors Answer: D Explanation: Voltage-drop calculations involve electrical parameters; the number of sign colors has no effect.
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Answer: B Explanation: Texas requires a minimum of 12 hours of continuing education every two years.
Question 16. A sign’s branch circuit is protected by a 15-A breaker. What is the minimum size of the equipment grounding conductor (EGC) required? A) 14-AWG copper B) 12-AWG copper C) 10-AWG copper D) 8-AWG copper Answer: A Explanation: NEC Table 250.122 indicates a 15-A circuit requires a 14-AWG copper EGC.
Question 17. Which NEC provision mandates that a sign’s disconnecting means be “readily accessible”? A) 600. B) 600. C) 600. D) 600. Answer: A Explanation: NEC 600.11 requires the disconnecting means for a sign to be readily accessible.
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Question 18. The maximum allowable temperature rise for a sign’s conductors in a conduit is limited by which NEC rule? A) 310.15(B)(3)(a) B) 310.15(B)(2)(a) C) 240.4(G) D) 110.14(A) Answer: B Explanation: NEC 310.15(B)(2)(a) addresses temperature correction factors for conductors in raceways.
Question 19. Which of the following is NOT a permissible method for grounding a portable sign? A) Using a grounding rod attached to the sign frame B) Connecting to the building’s grounding electrode system via a grounding wire C) Relying on the sign’s metal enclosure alone without a grounding conductor D) Using a ground-fault circuit interrupter (GFCI) in lieu of a ground Answer: C Explanation: A metal enclosure alone does not provide a proper grounding path; a dedicated grounding conductor is required.
Question 20. In a sign’s wiring diagram, the symbol “Δ” most commonly represents which component? A) Transformer B) Diode C) Switch D) Relay
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Question 23. Which NEC article addresses the installation of sign power supplies that are classified as “power limited circuits”? A) Article 210 B) Article 300 C) Article 725 D) Article 430 Answer: C Explanation: Article 725 covers “Class 2 and Class 3 Remote-Control, Signaling, and Power-Limited Circuits,” which includes many LED sign power supplies.
Question 24. When a sign’s transformer is installed in a location that is subject to flooding, which additional protection is required? A) Use of a larger transformer B) Installation of a secondary grounding rod C) Placement in a watertight enclosure rated NEMA 6 D) No additional protection is needed Answer: C Explanation: NEC requires equipment in flood-prone areas to be protected by a watertight enclosure, typically NEMA 6.
Question 25. The NEC permits the use of which cable type for external wiring of a low-voltage (≤ 30 V) LED sign? A) UF cable B) AC cable C) MC cable D) 12/2 NM cable
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Answer: A Explanation: Underground Feeder (UF) cable is rated for direct burial and can be used for low-voltage external wiring.
Question 26. Under Texas law, what is the maximum fine for an unlicensed person performing sign electrical work? A) $ B) $1, C) $2, D) $5, Answer: C Explanation: Texas Administrative Code imposes fines up to $2,500 for unlicensed electrical work, including sign installations.
Question 27. Which of the following is a required feature of a sign’s circuit breaker panel that supplies more than one sign? A) A dedicated breaker for each sign B) A main disconnect only C) A labeling system indicating each sign’s circuit D) A built-in surge protector Answer: C Explanation: NEC 600.13 requires clear labeling of each sign circuit in the panel.
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Answer: D Explanation: NEC 600.7 requires a minimum 8 in. clearance for neon secondary circuits rated above 10 kV.
Question 31. Which NEC article governs the installation of conduit in a sign that is mounted on a metal pole? A) 300. B) 358. C) 380. D) 410. Answer: B Explanation: Article 358 covers Electrical Metallic Tubing (EMT), which is commonly used on metal poles for sign installations.
Question 32. Under Texas licensing rules, a Journeyman Sign Electrician may work unsupervised on signs up to what maximum voltage? A) 120 V B) 240 V C) 600 V D) 1,000 V Answer: C Explanation: Texas permits Journeyman Sign Electricians to work on systems up to 600 V; higher voltages require a Master Sign Electrician.
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Question 33. Which of the following is the correct method for protecting a sign’s wiring from physical damage in a high-traffic pedestrian area? A) Run the cable in open air B) Install the cable in a conduit with a minimum ½-in. wall thickness C) Use flexible metal conduit without fittings D) Use a cable tray with a 1-in. cover plate Answer: B Explanation: NEC requires that wiring in areas subject to physical damage be protected by conduit of appropriate thickness; ½-in. EMT satisfies this requirement.
Question 34. The NEC permits the use of which type of disconnect for a sign located on a rooftop? A) Pull-out circuit breaker only B) Switch-type disconnect with a minimum rating of 125 % of the load C) Fuse-type disconnect not exceeding the branch-circuit rating D) Any disconnect that is within sight of the sign Answer: D Explanation: NEC 600.11 requires the disconnect to be readily accessible and within sight of the sign.
Question 35. Which factor is NOT considered when applying temperature correction to conductor ampacity for a sign installation? A) Ambient temperature B) Number of current-carrying conductors in the conduit C) Length of the run D) Conductor insulation type
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Question 38. Which of the following is a required marking on a sign enclosure that houses a transformer? A) “Do not open” B) “Transformers inside – keep dry” C) “NEC-approved” stamp only D) Manufacturer’s serial number Answer: B Explanation: NEC 600.41 requires enclosures containing transformers to be marked with “Transformers inside – keep dry” or equivalent wording.
Question 39. In Texas, which agency issues the electrical sign contractor license? A) Texas Department of Licensing and Regulation (TDLR) B) Texas Workforce Commission (TWC) C) Texas Department of Safety (TDS) D) Texas Public Utility Commission (TPUC) Answer: A Explanation: The Texas Department of Licensing and Regulation (TDLR) administers the Electrical Sign Contractor licensing program.
Question 40. Which NEC article defines the requirements for “outline lighting” of a building? A) Article 600 B) Article 410 C) Article 410. D) Article 410.
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Answer: A Explanation: Outline lighting is covered under Article 600, which includes the scope for “outline lighting” of structures.
Question 41. A sign’s wiring is routed through a metal-clad (MC) cable. What is the minimum size of the grounding conductor required for a 20-A circuit? A) 14-AWG copper B) 12-AWG copper C) 10-AWG copper D) 8-AWG copper Answer: B Explanation: NEC Table 250.122 indicates a 20-A circuit requires a 12-AWG copper EGC.
Question 42. Under OSHA, what is the minimum required distance between a worker and a live 480 V sign circuit when using an insulated tool? A) 1 ft B) 3 ft C) 6 ft D) No minimum if insulated tool is used Answer: D Explanation: OSHA requires proper insulation and PPE; there is no specific distance requirement if insulated tools and PPE are used correctly.
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Answer: D Explanation: A GFCI does not provide a bonding path; proper bonding must be achieved via conductors or lugs.
Question 46. For a sign that utilizes a 120 V/240 V split-phase supply, what is the minimum size of the neutral conductor required? A) Same size as the ungrounded conductors B) One size larger than the ungrounded conductors C) No neutral required for split-phase signs D) Minimum 12-AWG regardless of load Answer: A Explanation: NEC requires the neutral to be the same size as the ungrounded conductors when present.
Question 47. Which NEC article governs the installation of sign-related motors (e.g., rotating billboard mechanisms)? A) Article 430 B) Article 440 C) Article 500 D) Article 690 Answer: A Explanation: Article 430 covers motors, generators, and controllers, applicable when signs include moving parts.
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Question 48. What is the required marking on a sign’s circuit breaker to indicate it is dedicated to sign lighting? A) “SIGN” label on the breaker handle B) Colored handle only C) No special marking required D) “LED” printed on the breaker Answer: A Explanation: NEC 600.13 requires a clear label indicating the breaker serves a sign.
Question 49. According to NEC, which of the following is the correct maximum height for a sign’s wiring conduit that is installed on a building façade without a raceway cover? A) 6 ft B) 8 ft C) 10 ft D) No height limit if the conduit is listed for exterior use Answer: D Explanation: As long as the conduit is listed for exterior use and protected against physical damage, there is no height restriction.
Question 50. Under Texas law, what is the minimum age requirement to obtain a Journeyman Sign Electrician license? A) 18 years B) 19 years C) 21 years D) 23 years
