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Question 1. What is the primary purpose of the Oregon Electrical Safety Law (ORS Chapter 479)? A) To regulate labor unions B) To ensure the safe installation of electrical wiring and equipment C) To establish real estate licensing D) To regulate plumbing codes Answer: B Explanation: ORS Chapter 479 is designed to ensure electrical installations are safe for people and property. Question 2. Which license allows a person to install, maintain, and connect electric signs in Oregon? A) Limited Maintenance License B) General Journeyman License C) Electrical Sign Specialty License D) Residential Electrician License Answer: C Explanation: The Electrical Sign Specialty License authorizes work specifically on electric signs. Question 3. Who is responsible for ensuring that all electrical work complies with state regulations on a jobsite? A) The property owner B) The electrical contractor C) The real estate agent D) The building inspector Answer: B Explanation: The electrical contractor is legally responsible for code compliance. Question 4. When must an Oregon Electrical Sign Specialty License be renewed? A) Every year B) Every two years
C) Every three years D) Every five years Answer: B Explanation: Oregon requires license renewal every two years, with proof of continuing education. Question 5. Which document authorizes electrical work to be started on a new sign installation? A) Certificate of Occupancy B) Electrical Permit C) Real Estate Deed D) Construction Bond Answer: B Explanation: An electrical permit is required before commencing sign installation. Question 6. What is a Minor Installation Label (MIL) used for? A) Temporary structures only B) Small electrical installations not requiring a full permit C) Large commercial projects D) Underground wiring only Answer: B Explanation: MILs allow minor installations to be performed without a standard permit. Question 7. What is the role of an electrical inspector in Oregon? A) To design electrical systems B) To issue business licenses C) To verify compliance with code and safety standards D) To install equipment Answer: C Explanation: Inspectors ensure that installations meet code and safety standards before approval.
C) 30 inches D) 36 inches Answer: C Explanation: A minimum of 30 inches wide working space is required in front of equipment. Question 12. What is defined as "readily accessible" in Article 100 of the NEC? A) Accessible only with a key B) Reachable quickly without obstacles C) Behind locked doors D) At any height Answer: B Explanation: Readily accessible means it can be reached for operation or inspection without obstacles. Question 13. What is the primary function of a disconnecting means for sign circuits (Article 600.6)? A) To control lighting levels B) To provide overcurrent protection C) To allow for safe maintenance D) To ground the circuit Answer: C Explanation: The disconnecting means allows safe maintenance by de-energizing the sign circuit. Question 14. Which NEC article specifically governs electric signs and outline lighting? A) Article 210 B) Article 300 C) Article 600 D) Article 725 Answer: C Explanation: Article 600 contains requirements for electric signs and outline lighting.
Question 15. What color is generally required for equipment grounding conductors? A) Red B) Black C) Green or bare D) Blue Answer: C Explanation: Green or bare conductors are used for equipment grounding. Question 16. Which of the following is NOT an acceptable wiring method for exterior signs? A) Liquidtight flexible metal conduit B) NM cable C) Rigid metal conduit D) EMT Answer: B Explanation: NM cable is not suitable for outdoor or wet locations. Question 17. What is the minimum cover required for direct burial of electrical conduit under a parking lot (Table 300.5)? A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: D Explanation: A minimum of 24 inches cover is required under parking lots. Question 18. Which conductor must be identified with a white or gray color? A) Equipment grounding conductor B) Ungrounded (hot) conductor C) Grounded (neutral) conductor
Question 22. What is the function of bonding in electrical sign installations? A) Reduce voltage B) Provide path to ground for fault current C) Increase current D) Insulate the sign Answer: B Explanation: Bonding ensures a low impedance path to ground for fault current. Question 23. What is the required ampacity adjustment factor for more than three current-carrying conductors in a raceway (NEC Table 310.15(C)(1))? A) 80% B) 50% C) 70% D) 60% Answer: A Explanation: For 4-6 conductors, the ampacity is adjusted to 80%. Question 24. What is the minimum size equipment grounding conductor for a 20-ampere branch circuit (NEC Table 250.122)? A) 16 AWG B) 14 AWG C) 12 AWG D) 10 AWG Answer: B Explanation: 12 AWG copper or 10 AWG aluminum is required for a 20-ampere circuit. Question 25. Which rating must a sign disconnect switch have? A) Not less than the branch circuit rating
B) 15A at 120V C) 10A at 600V D) 5A at 277V Answer: A Explanation: The disconnect must be rated not less than the sign branch circuit. Question 26. What is the definition of a “Class 2 circuit” (Article 725)? A) High voltage, high power B) Limited power and voltage for safety C) For motors only D) Only for fire alarms Answer: B Explanation: Class 2 circuits are limited in power and voltage for intrinsic safety. Question 27. What is the minimum height above grade for sign conductors installed on a building exterior? A) 3 feet B) 8 feet C) 10 feet D) 18 feet Answer: B Explanation: Conductors must be at least 8 feet above grade when run on a building exterior. Question 28. What is the main requirement for installing a sign transformer inside a building? A) Must be painted B) Must be accessible for inspection and replacement C) Must be in a locked room D) Can be placed anywhere Answer: B
B) 6 feet C) 10 feet D) 12 feet Answer: B Explanation: EMT must be supported at intervals not exceeding 10 feet, but within 3 feet of each outlet box. Question 33. What is the minimum size junction box required for a conductor fill of three 12 AWG conductors? A) 2" x 2" x 2" B) 4" square C) 6" x 6" D) 8" round Answer: B Explanation: A 4" square box is standard for three 12 AWG conductors, per NEC box fill tables. Question 34. What is the required marking for field-installed conductors at a sign disconnect? A) Manufacturer’s logo B) Voltage and phase identification C) Date of installation D) Electrical contractor’s license number Answer: B Explanation: Conductors must be marked to identify voltage, phase, and purpose. Question 35. Which must be done before energizing a new sign circuit? A) Nothing B) Inspection and approval by the authority having jurisdiction C) Only customer approval D) Sign manufacturer’s approval
Answer: B Explanation: The AHJ must inspect and approve the circuit before energizing. Question 36. What is the minimum branch circuit ampacity for a sign rated at 12 amps continuous load? A) 12 amps B) 15 amps C) 20 amps D) 25 amps Answer: C Explanation: Continuous loads must be sized at 125%, so 12 x 1.25 = 15 amps, next standard size is 20 amps. Question 37. Which device provides personnel protection against electric shock in damp locations? A) AFCI B) GFCI C) Circuit breaker D) Surge protector Answer: B Explanation: GFCIs protect personnel from shock in damp or wet locations. Question 38. What defines a “continuous load”? A) Operates for 10 minutes or more B) Operates for 1 hour or more C) Operates for 3 hours or more D) Operates only during emergencies Answer: C Explanation: A load operating at maximum for 3 hours or more is considered continuous. Question 39. Which of the following is NOT classified as a sign accessory?
Explanation: NEC requires at least 6 inches of free conductor at outlet boxes. Question 43. What is the required clearance from combustible materials for sign transformers? A) 1 inch B) 3 inches C) 6 inches D) 12 inches Answer: B Explanation: A 3-inch clearance from combustibles is required for sign transformers. Question 44. In Oregon, who has the authority to interpret electrical code requirements? A) Homeowner B) Manufacturer C) The Authority Having Jurisdiction (AHJ) D) Electrical apprentice Answer: C Explanation: The AHJ interprets and enforces code requirements. Question 45. Which is true about a listed manufactured wiring system for a sign? A) Can be field modified B) Must be installed per listing and manufacturer instructions C) Requires no labeling D) Can be buried without cover Answer: B Explanation: These systems must be installed exactly as listed and per manufacturer instructions. Question 46. What is the maximum ampacity allowed for a 14 AWG copper conductor in a sign circuit? A) 10A B) 15A
C) 20A
D) 25A
Answer: B Explanation: 14 AWG copper is limited to 15 amps per NEC. Question 47. What is the minimum spacing between high-voltage sign secondary conductors and combustible material? A) 1/2 inch B) 1 inch C) 2 inches D) 3 inches Answer: C Explanation: NEC requires a minimum of 2 inches spacing. Question 48. What is the NEC requirement for a sign disconnect switch location? A) Hidden in a ceiling B) Within sight of the sign C) In a locked box at the service entrance D) Anywhere in the building Answer: B Explanation: The disconnect must be within sight of the sign. Question 49. Which of the following is NOT permitted for sign branch circuit wiring? A) MC cable B) NM cable in a wet location C) EMT D) Rigid metal conduit Answer: B Explanation: NM cable is not permitted in wet locations.
D) Not permitted Answer: D Explanation: UF cable is not permitted for direct burial under buildings. Question 54. What is the minimum rating required for a sign branch circuit disconnecting means? A) 10A B) 15A C) 20A D) Equal to the branch circuit rating Answer: D Explanation: The disconnect must be at least equal to the branch circuit rating. Question 55. Which of the following is NOT required for an electric sign installation? A) Listed sign transformer B) Listed sign disconnect C) Labeled wire connectors D) Painted sign frame Answer: D Explanation: Painting the sign frame is not a code requirement. Question 56. What is the requirement for the enclosure of splices for sign wiring? A) Can be left exposed B) Must be in a listed box or enclosure C) May be taped and buried D) May be left in open air Answer: B Explanation: Splices must be enclosed in a listed box or enclosure. Question 57. What is the maximum branch circuit voltage for most electric sign installations?
A) 120 volts B) 150 volts C) 277 volts D) 480 volts Answer: C Explanation: Most sign branch circuits are limited to 277 volts. Question 58. What is the primary purpose of a GFCI outlet in sign installations? A) Overcurrent protection B) Personnel protection from electric shock C) Surge protection D) Load control Answer: B Explanation: GFCIs protect personnel from electric shock in sign circuits. Question 59. When is an AFCI required in sign installations? A) For circuits in dwelling units B) For outdoor signs C) For bathroom signs D) For all sign circuits Answer: A Explanation: AFCIs are required for branch circuits in dwelling units. Question 60. What is the minimum conductor size for sign branch circuits over 15 amps? A) 14 AWG B) 12 AWG C) 10 AWG D) 8 AWG Answer: B
B) 24 inches C) 30 inches D) 36 inches Answer: C Explanation: 30 inches is the minimum working clearance per NEC 110.26. Question 65. When is a separate sign circuit required (Article 600.5)? A) Only for signs over 100 watts B) For each sign C) When required by the manufacturer D) When signs are in a public area Answer: D Explanation: Public area signs generally require a dedicated circuit to avoid overloading. Question 66. What is the minimum size for an equipment grounding conductor in a 30-amp sign circuit? A) 14 AWG B) 12 AWG C) 10 AWG D) 8 AWG Answer: B Explanation: 10 AWG is required for a 30-amp copper circuit per NEC Table 250.122. Question 67. Which NEC article covers flexible cords and cables for sign installations? A) Article 300 B) Article 400 C) Article 600 D) Article 314 Answer: B Explanation: Article 400 covers flexible cords and cables used in sign installations.
Question 68. What must be done if a listed sign is modified in the field? A) Nothing B) The listing is void unless re-evaluated by a qualified lab C) Only notify the inspector D) Paint the modification Answer: B Explanation: Field modification voids the listing unless re-evaluated and re-labeled. Question 69. What is the minimum required rating for a portable sign cord? A) 10A B) 15A C) 20A D) 30A Answer: B Explanation: Portable sign cords must be rated at least 15 amps. Question 70. For outline lighting, what is the minimum required branch circuit ampacity? A) 10 amps B) 15 amps C) 20 amps D) 25 amps Answer: B Explanation: Branch circuits for outline lighting must be at least 15 amps. Question 71. What is the minimum cover for direct burial of rigid metal conduit in earth (not under concrete)? A) 6 inches B) 12 inches
