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Electrician Ultimate Exam
Question 1. Which NEC article defines the requirements for outline lighting and section signs? A) Article 210 B) Article 300 C) Article 600 D) Article 410 Answer: C Explanation: NEC Article 600 specifically addresses the installation of electric signs, including outline lighting and section signs. Question 2. In a sign circuit, if the voltage is 120 V and the current is 2 A, what is the power consumption? A) 60 W B) 240 W C) 480 W D) 720 W Answer: B Explanation: Power (P) = V × I = 120 V × 2 A = 240 W. Question 3. What is the maximum allowable secondary-circuit voltage for neon sign transformers under NEC? A) 5,000 V B) 10,000 V C) 15,000 V D) 20,000 V Answer: C Explanation: NEC limits secondary voltage of neon sign transformers to 15,000 V to reduce arcing hazards. Question 4. When calculating voltage drop for a 300-ft run of 12-AWG copper conductors supplying a 120 V sign, which factor is NOT considered? A) Conductor resistance per foot B) Load current
Electrician Ultimate Exam
C) Ambient temperature D) Color of conduit Answer: D Explanation: Conduit color does not affect voltage drop; resistance, current, and temperature do. Question 5. Which insulation type is permitted for branch-circuit conductors in outdoor sign installations? A) NM-B B) THHN C) UF-B D) AC Answer: B Explanation: THHN (thermoplastic high-heat nylon) is approved for wet locations and outdoor use. Question 6. According to NEC Table 310.15(B)(16), what is the ampacity of 10 AWG copper THHN conductors at 75 °C? A) 20 A B) 30 A C) 35 A D) 40 A Answer: B Explanation: Table 310.15(B)(16) lists 30 A for 10 AWG copper THHN at 75 °C. Question 7. Which raceway material is NOT allowed for use in a wet location for sign wiring? A) EMT B) PVC C) Rigid metal conduit (RMC) D) Flexible metal conduit (FMC) with water-tight fittings Answer: A
Electrician Ultimate Exam
Question 11. A sign uses a Class 2 power source. Which of the following statements is true? A) It may supply up to 150 V AC or 300 V DC. B) It must be protected by a GFCI. C) It is limited to 100 W maximum output. D) It requires a dedicated 30 A breaker. Answer: A Explanation: Class 2 circuits are limited to 150 V AC or 300 V DC and have limited power capability, but the specific wattage limit varies with equipment. Question 12. Which calculation determines the VA rating needed for a LED sign that draws 3 A at 24 V? A) 24 V × 3 A = 72 VA B) (24 V + 3 A) ÷ 2 = 13.5 VA C) (24 V ÷ 3 A) = 8 VA D) 3 A – 24 V = –21 VA Answer: A Explanation: Apparent power (VA) = voltage × current, so 24 V × 3 A = 72 VA. Question 13. When installing a sign transformer in an attic, which of the following is required by NEC? A) Direct burial rating B) Adequate ventilation to maintain ≤ 40 °C C) Installation within 12 in of the nearest duct D) Use of only flexible conduit Answer: B Explanation: Transformers generate heat; NEC requires sufficient ventilation to keep temperature within safe limits. Question 14. Which of the following is the correct method to size a conduit fill for three 12-AWG THHN conductors? A) Use 40 % of conduit cross-sectional area B) Use 53 % of conduit cross-sectional area
Electrician Ultimate Exam
C) Use 31 % of conduit cross-sectional area D) Use 70 % of conduit cross-sectional area Answer: C Explanation: For three conductors, NEC permits a maximum fill of 31 % of the conduit’s internal area. Question 15. Under Texas Occupations Code Chapter 1305, which activity is prohibited for an unlicensed journeyman sign electrician? A) Repairing existing signage B) Installing new neon tubing on a building façade C) Performing a routine inspection of a sign’s grounding system D) Replacing a burnt-out LED module Answer: B Explanation: Installation of new sign work is considered “construction” and requires a valid sign electrician license in Texas. Question 16. The OSHA standard for fall protection requires a minimum anchor point strength of: A) 2 times the worker’s weight B) 3 times the worker’s weight C) 5 times the worker’s weight D) 10 times the worker’s weight Answer: C Explanation: OSHA 1926.502(d)(24) specifies that personal fall arrest systems must be anchored to support at least five times the maximum arresting force. Question 17. Which of the following is the correct definition of “outline lighting” per NEC? A) Lighting that illuminates the interior of a sign. B) Lighting that outlines the perimeter of a sign or structure. C) Lighting that is powered by a low-voltage transformer. D) Lighting used exclusively for emergency signage. Answer: B
Electrician Ultimate Exam
Question 21. What is the maximum number of outlets allowed on a single 20 - A branch circuit feeding sign lighting? A) 1 B) 2 C) 4 D) Unlimited, as long as load does not exceed 80 % of breaker rating Answer: D Explanation: NEC does not limit the number of outlets; the circuit must simply not exceed 80 % of the breaker’s rating for continuous loads. Question 22. When installing a high-intensity discharge (HID) lamp for a pylon sign, which of the following is required? A) A dedicated 50 A breaker. B) A ballast rated for the specific HID lamp. C) Direct connection to a 240 V supply without a transformer. D) Use of PVC conduit only. Answer: B Explanation: HID lamps require a compatible ballast to limit current and provide proper starting voltage. Question 23. Which factor does NOT affect the ampacity adjustment for conductors in a conduit? A) Ambient temperature B) Number of current-carrying conductors C) Conductor color D) Installation method (e.g., in raceway, cable) Answer: C Explanation: Conductor color is irrelevant to ampacity; temperature, conductor count, and installation method all affect adjustment factors. Question 24. A sign uses a 150 VA transformer. What is the minimum size of the grounding conductor required per NEC Table 250.122? A) 12 AWG copper B) 10 AWG copper
Electrician Ultimate Exam
C) 8 AWG copper D) 6 AWG copper Answer: A Explanation: For a 150 VA load, Table 250.122 calls for a minimum 12 AWG copper grounding conductor. Question 25. Which of the following is a required feature of a weather-proof box used for outdoor sign wiring? A) Must be painted the same color as the sign. B) Must have a gasketed cover rated for the installed location. C) Must be made of wood. D) Must contain an integrated transformer. Answer: B Explanation: NEC requires outdoor boxes to be listed for weather protection, typically with a gasketed cover. Question 26. The NEC permits the use of flexible metal conduit (FMC) for sign wiring under which condition? A) Only for indoor applications. B) Only if the conduit length does not exceed 6 ft. C) When the conduit is listed for the environment and supported at intervals not exceeding 4 ft. D) FMC is never permitted for sign wiring. Answer: C Explanation: FMC can be used when listed for the environment and supported per the NEC support requirements. Question 27. Which of the following is the correct method to calculate the required conductor size for a 500-ft run supplying a 120 V, 5 A sign, limiting voltage drop to 3 %? A) Use NEC Table 310.15(B)(16) directly. B) Apply the voltage-drop formula and select the next larger standard size. C) Use 14 AWG because it is the default for 15 A circuits. D) Use the smallest conductor that fits in the conduit.
Electrician Ultimate Exam
Question 31. Which of the following is the correct ampacity of a 6 AWG copper conductor with THHN insulation in a 90 °C column? A) 55 A B) 65 A C) 75 A D) 95 A Answer: D Explanation: Table 310.15(B)(16) lists 95 A for 6 AWG copper THHN at 90 °C. Question 32. When installing a sign on a metal pole, the bonding jumper must be connected to which part of the pole? A) Only the paint-coated surface. B) The pole’s grounding lug or threaded hole listed for bonding. C) The decorative finials. D) The pole’s topmost point only. Answer: B Explanation: NEC requires bonding to a listed grounding point on the metal pole to ensure a low-impedance path. Question 33. What is the minimum rating for an overcurrent protective device protecting a sign feeder that supplies a total load of 1,200 VA at 120 V? A) 10 A B) 15 A C) 20 A D) 30 A Answer: C Explanation: Load current = 1,200 VA ÷ 120 V = 10 A. Applying 125 % for continuous load gives 12.5 A; the next standard breaker size is 15 A, but NEC also requires feeder protection not less than the calculated load, so a 15 A breaker is acceptable. However, many jurisdictions require rounding up to the next standard size, which would be 15 A. Since 20 A is listed, the safest answer is 15 A. (Correct answer: B) Explanation: The calculated load is 10 A; applying the 125 % factor yields 12.5 A, so a 15 A breaker is the minimum standard size.
Electrician Ultimate Exam
Question 34. Which of the following statements about field-installed skeleton tubing for neon signs is true? A) It may be installed without a listed transformer. B) The tubing must be pre-tested and sealed at the factory. C) The installation must follow the dimensions listed in NEC 600.12. D) The tubing can be installed in any conduit type. Answer: C Explanation: NEC 600.12 outlines the installation requirements for field-installed neon skeleton tubing, including dimensions and support. Question 35. Under OSHA, which of the following is the required lockout/tagout procedure before servicing a sign’s transformer? A) Only verbal confirmation from a supervisor. B) Apply a lockout device to the circuit breaker and attach a tag identifying the worker. C) Turn off the sign and proceed without additional precautions. D) Use a voltage tester only. Answer: B Explanation: OSHA 1910.147 mandates that a lockout device be applied to the energy isolating device and a tag be placed to identify the authorized employee. Question 36. Which NEC requirement applies to the installation of a disconnecting means for a sign located on a rooftop? A) Must be within 10 ft of the sign. B) Must be weather-proof and readily accessible. C) Must be a handheld plug-in type only. D) No disconnect is required if the sign is less than 5 ft tall. Answer: B Explanation: Roof-mounted signs require a disconnect that is weather-proof and readily accessible per NEC 600.7. Question 37. A sign’s transformer is rated for 240 VA at 120 V. What is the full-load current of the transformer?
Electrician Ultimate Exam
Answer: B Explanation: LED drivers are sensitive to temperature; installation must consider ambient temperature and ventilation. Question 41. According to NEC, what is the maximum voltage allowed for a sign powered by a low-voltage power supply (Class 2) in a commercial building? A) 30 V AC B) 50 V DC C) 120 V AC D) 150 V AC Answer: D Explanation: Class 2 circuits are limited to 150 V AC or 300 V DC per NEC 725.3. Question 42. Which of the following is a required feature of a sign’s junction box installed outdoors? A) Must be made of steel only. B) Must have a NEMA rating of at least 4. C) Must be painted the same color as the sign. D) Must contain an integral transformer. Answer: B Explanation: Outdoor junction boxes must meet NEMA 4 (or higher) for protection against rain, splashing water, and dust. Question 43. In Texas, which agency enforces the Electrical Safety Act for journeyman sign electricians? A) Texas Department of Public Safety B) Texas Commission on Environmental Quality C) Texas Department of Licensing and Regulation (TDLR) D) Texas Workforce Commission Answer: C Explanation: TDLR administers the Electrical Safety Act and oversees licensing and enforcement.
Electrician Ultimate Exam
Question 44. A sign’s neon transformer has a primary voltage of 120 V and a secondary voltage of 12,000 V. What is the transformer’s turns ratio? A) 1: B) 1: C) 10: D) 100: Answer: A Explanation: Turns ratio = primary voltage ÷ secondary voltage = 120 V ÷ 12,000 V = 1:100. Question 45. Which of the following is the correct method for supporting a horizontal run of EMT conduit for a sign installation? A) Support every 3 ft. B) Support every 10 ft. C) Support every 6 ft. D) No support required if conduit is less than 2 ft long. Answer: C Explanation: NEC 358.30 requires EMT to be supported at intervals not exceeding 6 ft and within 3 ft of each outlet or junction. Question 46. Which of the following is the correct NEC classification for a sign that uses a 30 kVA, 480 V transformer? A) Class 1 B) Class 2 C) Class 3 D) Not classified Answer: A Explanation: Transformers over 150 V and with higher power exceed Class 2 limits, thus they are Class 1 circuits. Question 47. What is the minimum conduit fill percentage allowed for a single conductor in a raceway? A) 10 % B) 20 %
Electrician Ultimate Exam
Answer: B Explanation: The power supply is not rated for 50 Hz; using it on a 50 Hz supply would violate the listing. Question 51. Which of the following is a required feature of a sign’s disconnect switch installed in a commercial building? A) Must be a 2-pole, 20-A switch. B) Must be lockable in the “off” position. C) Must be located inside the sign enclosure. D) Must be a push-button type only. Answer: B Explanation: NEC 600.7 requires the disconnect to be capable of being locked in the open (off) position for safety. Question 52. A sign uses a 12 V, 2 A LED module. What is the minimum size of the grounding conductor required for the branch circuit? A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: A Explanation: The load is 24 VA; Table 250.122 requires a minimum 14 AWG copper grounding conductor for circuits up to 20 A. Question 53. Which of the following is the correct NEC requirement for the spacing of supports for a suspended neon sign tubing? A) Every 3 ft horizontally. B) Every 6 ft horizontally. C) Every 12 ft horizontally. D) No supports required if the tubing is less than 10 ft long. Answer: B Explanation: NEC 600.12 requires support of neon tubing at intervals not exceeding 6 ft.
Electrician Ultimate Exam
Question 54. Under Texas law, which of the following activities can a licensed journeyman sign electrician perform without a separate contractor’s license? A) Constructing a new billboard structure. B) Installing a new LED sign on an existing building façade. C) Designing the sign layout and obtaining permits. D) Performing all of the above. Answer: B Explanation: Installation of signs is within the scope of a sign electrician’s license; construction of the supporting structure requires a contractor’s license. Question 55. Which of the following statements about a Class 2 power source for a sign is correct? A) It may not exceed 30 VA. B) It must be protected by a GFCI in all locations. C) It is limited to 150 V AC or 300 V DC. D) It requires a dedicated grounding electrode. Answer: C Explanation: Class 2 circuits are limited to 150 V AC or 300 V DC per NEC. Question 56. For a sign that draws 8 A at 120 V, what is the minimum size of the branch-circuit breaker required? A) 10 A B) 15 A C) 20 A D) 25 A Answer: B Explanation: Continuous load = 8 A × 1.25 = 10 A; the next standard breaker size is 15 A. Question 57. Which of the following is the correct method to calculate the required conduit size for a 500-VA sign feeder using 14-AWG copper conductors? A) Use Table 4 of Chapter 9 to find the fill area for 14-AWG, then select conduit that meets 40 % fill. B) Use the smallest conduit that physically fits the conductors.
Electrician Ultimate Exam
Answer: C Explanation: OSHA 1926.502(b)(6) requires fall-arrest protection for any work at heights of 6 ft or more; however, bucket trucks typically require protection at 8 ft due to equipment design. The most conservative answer is 8 ft. Question 61. Which of the following is the correct NEC requirement for the grounding of a metal sign enclosure that houses a transformer? A) Ground the enclosure only if the transformer is over 500 VA. B) Bond the enclosure to the equipment grounding conductor of the circuit. C) No grounding required if the enclosure is painted. D) Use a separate grounding electrode for the enclosure. Answer: B Explanation: NEC requires bonding of metal enclosures to the equipment grounding conductor. Question 62. A sign is powered by a 240 V, 3-phase, 60 Hz supply. Which of the following is the correct NEC classification? A) Class 1 B) Class 2 C) Class 3 D) Not classified Answer: A Explanation: The voltage exceeds Class 2 limits, making it a Class 1 circuit. Question 63. Which of the following is the correct minimum size for a grounding electrode conductor (GEC) that is connected to a 100 A service entrance? A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: C Explanation: Table 250.122 specifies a 10 AWG copper GEC for a 100 A service.
Electrician Ultimate Exam
Question 64. According to NEC, what is the minimum distance required between a sign’s disconnect and the sign itself when the disconnect is not within sight? A) 5 ft B) 10 ft C) 25 ft D) No distance is permitted; it must be within sight. Answer: D Explanation: NEC requires the disconnect to be within sight of the sign; if not, it is non-compliant. Question 65. Which of the following is the correct method for determining the required ampacity of a feeder supplying multiple signs with a total load of 3,600 VA at 120 V? A) Divide VA by voltage to get current, then apply 125 % factor. B) Use the feeder size listed in Table 310.12. C) Select a feeder based on the largest single sign load. D) Use a 15 A breaker regardless of load. Answer: A Explanation: Total current = 3,600 VA ÷ 120 V = 30 A; applying 125 % for continuous load yields 37.5 A, so a feeder sized for at least 40 A is required. Question 66. Which of the following is a required label on a sign’s disconnect switch? A) Manufacturer’s logo B) “Disconnect – Do Not Operate” in red letters C) Voltage rating and amperage rating of the circuit D) Installation date Answer: C Explanation: NEC requires that disconnecting means be labeled with the circuit’s voltage and amperage rating. Question 67. For a sign that uses a 12 V, 1 A LED driver, which of the following conduit fill percentages is permissible for a single conductor? A) 10 %
