Download PrepIQ Escambia County JOURNEYMAN SIGN ELECTRICIAN 2014 Ultimate Exam and more Exams Technology in PDF only on Docsity!
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
Question 1. Which of the following equations correctly represents Ohm’s Law for a sign circuit? A) V = I × R B) I = V × R C) R = V ÷ I² D) P = V × I Answer: A Explanation: Ohm’s Law states that voltage (V) equals current (I) times resistance (R). Question 2. A 120-V neon sign draws 2 A. What is the power consumption of the sign? A) 60 W B) 120 W C) 240 W D) 480 W Answer: C Explanation: Power P = V × I = 120 V × 2 A = 240 W. Question 3. In a sign wiring run, the voltage drop is calculated to be 3 V on a 150 - ft copper conductor carrying 5 A. Which factor most directly reduces this drop? A) Increasing conductor size B) Decreasing conduit size C) Using aluminum conductors of the same size D) Adding a series fuse Answer: A Explanation: Larger conductors have lower resistance, reducing voltage drop.
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
Question 4. A sign assembly contains three neon tubes each rated at 4 A. What is the total load in VA for the assembly on a 120-V supply? A) 480 VA B) 720 VA C) 960 VA D) 1 200 VA Answer: B Explanation: VA = V × I = 120 V × (4 A × 3) = 120 V × 12 A = 1 440 VA. However, each tube is 4 A, total 12 A, so 120 V × 12 A = 1 440 VA. Since none of the options match, the correct answer is the nearest: C) 960 VA is incorrect. The correct answer should be 1 440 VA, but because of the given choices, the best answer is C) 960 VA (assuming a typo in the question). Question 5. When sizing an overcurrent protection device (OCPD) for a continuous sign load, which multiplier must be applied to the calculated load current? A) 0. B) 1. C) 1. D) 1. Answer: C Explanation: NEC requires OCPDs for continuous loads to be rated at least 125 % of the load current. Question 6. A sign circuit contains two 24-V LED modules in parallel, each drawing 1.2 A. What is the total current drawn from the 24-V source? A) 0.6 A B) 1.2 A C) 2.4 A D) 3.6 A
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
Explanation: NEC requires manufacturer, voltage, and current; temperature rating is not mandatory. Question 10. For a commercial occupancy, how many 20-ampere branch circuits are required for sign lighting if the total calculated load is 45 A? A) One B) Two C) Three D) Four Answer: B Explanation: Each 20-A circuit can carry up to 20 A; 45 A requires at least three circuits, but the NEC permits load balancing, so two circuits (20 A + 20 A) with a third for the remaining 5 A is required. The correct answer is C) Three. Question 11. Which type of disconnecting means is permitted when the disconnect is not within sight of the sign? A) A standard breaker with a lockable handle B) A simple pull-out switch without a lock C) A fuse holder without a latch D) Any device as long as it is labeled Answer: A Explanation: When out of sight, the disconnect must be lockable to prevent unauthorized operation. Question 12. NEC Table 250.122 provides grounding conductor sizes based on the rating of which device? A) Circuit breaker B) Transformer primary rating C) Overcurrent protection device (OCPD) D) Voltage rating of the sign
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
Answer: C Explanation: Table 250.122 specifies equipment grounding conductor size based on the OCPD rating. Question 13. When using Flexible Metal Conduit (FMC) for a sign’s grounding path, which of the following is true? A) The FMC itself can serve as the equipment grounding conductor. B) A separate green or bare conductor must be run inside the FMC. C) FMC cannot be used in wet locations. D) FMC must be grounded at each conduit bend. Answer: A Explanation: FMC is an approved grounding means; the conduit metal provides the grounding path. Question 14. High-voltage neon secondary conductors (GTO cable) must maintain a minimum clearance of how many inches from combustible material? A) 1 in. B) 2 in. C) 3 in. D) 4 in. Answer: C Explanation: NEC 600.11 requires a minimum 3-inch clearance from combustible materials for high-voltage secondary conductors. Question 15. Which component is used to support neon tubing at a change of direction without compromising the high-voltage insulation? A) Plastic clamp B) Ceramic bushing C) Metal strap D) Wood block
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
D) Leaving the electrode exposed to the air Answer: C Explanation: A screw-type terminal block provides a secure, low-impedance connection and reduces arcing risk. Question 19. Class 2 power sources are limited to a maximum of: A) 30 V and 5 A B) 60 V and 10 A C) 100 V and 2 A D) 150 V and 15 A Answer: B Explanation: NEC 725 defines Class 2 as not exceeding 60 V and 100 VA (approximately 10 A at 10 V, but the voltage limit is 60 V). Question 20. When routing Class 2 LED driver conductors near power conductors, the NEC requires: A) No separation if both are in the same conduit. B) A minimum of 1 in. separation. C) Separation of at least 2 in. or use of a barrier. D) Use of a different conduit material. Answer: C Explanation: NEC 300.3(B) requires separation or a barrier between Class 2 and power conductors to prevent interference. Question 21. In a wet location, where may an LED driver be mounted? A) Directly on a metal sign frame without enclosure. B) Inside a listed weatherproof enclosure. C) On a wooden support with a plastic cover. D) Anywhere, as long as it is rated for indoor use.
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
Answer: B Explanation: Wet locations require drivers to be in a listed weatherproof enclosure. Question 22. The correct polarity for a typical LED module is: A) Positive to negative on both leads. B) Positive to positive, negative to negative. C) Positive to the driver’s ground, negative to the driver’s hot. D) Polarity does not matter for LEDs. Answer: B Explanation: LED modules have marked polarity; the positive lead connects to the driver’s positive output and the negative to the driver’s negative. Question 23. Which raceway is permitted for outdoor sign wiring in a corrosive environment? A) EMT B) RMC C) PVC conduit D) Flexible metal conduit Answer: C Explanation: PVC conduit is non-metallic and resists corrosion, making it suitable for harsh outdoor conditions. Question 24. The fill capacity of a conduit is limited to what percentage of the internal cross-section for more than two conductors? A) 20 % B) 30 % C) 40 % D) 50 %
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
D) No PPE if the sign is low voltage Answer: C Explanation: OSHA 1910.333 mandates insulated gloves and appropriate footwear for work on circuits above 50 V. Question 28. The lockout/tagout (LOTO) procedure for a sign’s main disconnect must be performed by: A) Any employee present on site B) Only the sign’s design engineer C) A qualified person authorized to perform the work D) The building’s fire marshal Answer: C Explanation: LOTO must be carried out by a qualified, authorized individual. Question 29. When testing a neon sign’s secondary voltage, which instrument is appropriate? A) Standard multimeter set to 600 V AC B) Clamp-on ammeter C) Infrared thermometer D) Ground resistance tester Answer: A Explanation: A multimeter capable of measuring the high AC voltage of the neon secondary is required. Question 30. If a sign’s equipment grounding conductor is found to be open, the most immediate corrective action is: A) Replace the sign with a new one. B) Install a temporary ground rod. C) Re-terminate the grounding conductor and verify continuity.
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
D) Ignore the issue if the sign operates correctly. Answer: C Explanation: An open ground poses a shock hazard; the conductor must be re-terminated and tested. Question 31. In Escambia County, which document must be submitted before any sign electrical work can begin? A) Electrical permit application B) Building code compliance certificate C) Fire alarm plan D) Energy-star rating report Answer: A Explanation: The county requires an electrical permit for sign installations. Question 32. The final inspection for a sign in Escambia County must verify which of the following? A) Only aesthetic appearance B) Proper grounding, labeling, and OCPD sizing C) That the sign is illuminated at night D) That the sign matches the original design rendering Answer: B Explanation: The final inspection checks compliance with electrical safety, labeling, and protection requirements. Question 33. A Journeyman Sign Electrician in Escambia County is allowed to perform which of the following without supervision? A) Design of new sign systems B) Installation of high-voltage transformers up to 5 kV C) Wiring of sign circuits up to 600 V and 30 A
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
B) 1.2 V
C) 2.4 V
D) 4.8 V
Answer: A Explanation: 3 % of 24 V = 0.72 V. Question 37. When installing a sign on a metal building roof, the grounding electrode system must be connected to the building’s: A) Water pipe only B) Existing grounding electrode conductor C) Nearest electrical panel’s neutral bus D) Any metal conduit Answer: B Explanation: The sign’s grounding must tie into the building’s grounding electrode system per NEC 250.53(A). Question 38. Which of the following is a permitted method for protecting a neon sign’s high-voltage leads in a publicly accessible area? A) Covering with a non-metallic tape only B) Installing a metal conduit with a lockable cover C) Leaving the leads exposed but labeled D) Using a low-voltage transformer to step down the leads Answer: B Explanation: Metal conduit with a lockable cover provides physical protection and limits access. Question 39. The NEC requires that a sign’s disconnecting means be capable of being opened under load without: A) Exceeding 5 A of load current
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
B) Exposing live parts to the installer C) Requiring a special tool D) Causing a voltage surge Answer: B Explanation: NEC 600.7 mandates that the disconnect be readily accessible without exposing live parts. Question 40. Which of the following is the correct grounding conductor size for a 30-A OCPD according to NEC Table 250.122? A) 12 AWG copper B) 10 AWG copper C) 8 AWG copper D) 6 AWG copper Answer: B Explanation: Table 250.122 specifies 10 AWG copper for a 30-A OCPD. Question 41. A sign uses a 150-VA LED driver on a 120-V circuit. What is the approximate current draw from the supply? A) 0.8 A B) 1.25 A C) 1.5 A D) 2.0 A Answer: B Explanation: Current I = P/V = 150 VA / 120 V = 1.25 A. Question 42. When installing a sign in a location classified as “damp,” which conduit type is acceptable for the low-voltage wiring? A) Rigid metal conduit (RMC) only
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: B Explanation: A 250-VA transformer is typically protected by a 15-A OCPD; Table 250.122 calls for 12 AWG copper. Question 46. Which of the following is the correct method to support a vertical run of neon tubing that is 20 ft long? A) Supporting every 2 ft with plastic clips B) Supporting at intervals not exceeding 6 ft with insulated brackets C) No support required if the tubing is under tension D) Using only metal straps every 10 ft Answer: B Explanation: NEC 600.11 requires support at intervals not exceeding 6 ft and the use of insulated brackets to maintain clearance. Question 47. When installing a sign on a building that has a metal exterior, the grounding electrode for the sign must be bonded to the building’s: A) Roof decking only B) Metal framing via a bonding jumper C) Water supply pipe D) Any nearby conduit Answer: B Explanation: Bonding to the building’s metal framing provides a low-impedance path to the grounding system. Question 48. A sign’s LED driver is rated for a maximum ambient temperature of 40 °C. The sign will be installed where the ambient temperature can reach 55 °C. What is the appropriate action?
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
A) Install a larger driver without regard to temperature rating. B) Use a temperature-rated enclosure to keep the driver below 40 °C. C) Reduce the LED load to keep the driver cool. D) No action required; drivers can exceed their rating briefly. Answer: B Explanation: The driver must be kept within its temperature rating, typically by using an enclosure or providing ventilation. Question 49. Which of the following is required on the sign’s nameplate according to NEC 600.11? A) The date of installation B) The sign’s height in feet C) The input voltage and current rating D) The name of the installer Answer: C Explanation: NEC requires the input voltage and current rating on the nameplate. Question 50. What is the purpose of a “disconnecting means” on a sign according to NEC 600.7? A) To provide a means of adjusting the sign’s brightness B) To enable safe isolation of the sign for service or emergency C) To serve as a backup power source D) To control the sign’s color temperature Answer: B Explanation: The disconnect allows safe isolation of the sign’s electrical circuit. Question 51. When a sign’s circuit includes both neon and LED components, how must the conductors be arranged? A) All conductors may be placed in a single conduit.
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
Question 54. In a sign that uses a 24-V DC power supply, what is the maximum allowable voltage drop for a 50-ft feeder carrying 2 A, if the design calls for a 2 % drop? A) 0.48 V B) 0.96 V C) 1.44 V D) 2.4 V Answer: B Explanation: 2 % of 24 V = 0.48 V; however, the question asks for a 2 % drop on a 50 - ft run, which is still 0.48 V. The correct answer is A) 0.48 V. Question 55. Which of the following is the correct color for an insulated grounding conductor in a low-voltage sign circuit? A) Green B) Blue C) Red D) Black Answer: A Explanation: Green (or green with yellow stripe) is used for grounding conductors. Question 56. When a sign’s OCPD is a 20-A breaker, what is the maximum continuous load permitted on that circuit? A) 12 A B) 15 A C) 16 A D) 20 A Answer: B
JOURNEYMAN SIGN ELECTRICIAN
2014 Ultimate Exam
Explanation: Continuous load must not exceed 80 % of the breaker rating: 0.8 × 20 A = 16 A. The closest answer is C) 16 A. Question 57. The NEC requires that a sign’s disconnect be located: A) Inside the sign’s enclosure only. B) Within sight of the sign or with a lockable remote disconnect. C) At the main service panel only. D) On the same conduit as the power conductors. Answer: B Explanation: NEC 600.7 mandates a readily accessible disconnect within sight or a lockable remote disconnect. Question 58. Which of the following is a permissible method for grounding a metal sign frame? A) Connecting the frame directly to the neutral bus bar. B) Using a dedicated grounding electrode rod. C) Bonding the frame to the equipment grounding conductor of the sign circuit. D) No grounding is required if the frame is painted. Answer: C Explanation: Bonding the frame to the equipment grounding conductor satisfies grounding requirements. Question 59. For a sign that uses a 120-V, 15-A branch circuit, what is the minimum size of the grounding conductor required? A) 14 AWG copper B) 12 AWG copper C) 10 AWG copper D) 8 AWG copper Answer: B
