Download Lake County Florida Elevator Specialty Electrical GITS Exam Questions and more Exams Technology in PDF only on Docsity!
Exam
Question 1. Which NEC article specifically governs the electrical requirements for elevator equipment, including wiring methods and over‑current protection? A) Article 210 B) Article 300 C) Article 620 D) Article 430 Answer: C Explanation: NEC Article 620 is dedicated to the special provisions for elevators, covering wiring, feeders, disconnects, and safety circuits. Question 2. Under the code hierarchy in Florida, when a conflict exists between the NEC and ASME A17.1, which rule takes precedence? A) The NEC because it is a national code B) The more restrictive requirement, regardless of source C) ASME A17.1 only for mechanical aspects D) The local building official’s interpretation Answer: B Explanation: The hierarchy requires applying the stricter rule when codes overlap; thus the more restrictive provision, whether from NEC or ASME A17.1, governs. Question 3. In Lake County, which license authorizes an electrician to perform specialty elevator electrical work? A) General Electrical Contractor (GEC) license B) Specialty Electrical – GITS license C) Low‑Voltage Systems license D) Mechanical Contractor license Answer: B Explanation: The Specialty Electrical – GITS (General Installation and Testing Services) license is required for elevator electrical installations in Lake County.
Exam
Question 4. A single‑line diagram for an elevator shows a 480 V three‑phase motor fed from a 400 A breaker. Which NEC rule determines the minimum conductor size for this feeder? A) NEC 310.15(B)(16) ampacity tables B) NEC 210.20(A) branch circuit sizing C) NEC 430.22 for motor circuits D) NEC 625.41 for receptacles Answer: A Explanation: Feeder conductor sizing follows NEC 310.15(B)(16) ampacity tables, adjusted for temperature, bundling, and correction factors. Question 5. Which wiring method is explicitly permitted for use within the hoistway of a new elevator installation? A) Electrical Metallic Tubing (EMT) B) Rigid Non‑Metallic Conduit (RNC) C) Flexible Metal Conduit (FMC) D) Direct‑buried cable Answer: B Explanation: NEC 620.21 allows rigid non‑metallic conduit (RNC) and rigid metal conduit (RMC) in hoistways; EMT is prohibited due to mechanical protection concerns. Question 6. The main disconnect for an elevator motor must be located: A) Inside the car top panel B) Within the machine room, not more than 6 ft above the floor C) At the service entrance panel D) In the pit, adjacent to the pit stop switch Answer: B Explanation: NEC 620.51 requires the main disconnect to be in the machine room, readily accessible, and not more than 6 ft above the floor.
Exam
A) Installing a line‑reactor at the service entrance B) Using a 3‑phase delta‑wye transformer with a K‑rated core C) Adding a dV/dt filter at the motor leads D) Employing a multi‑pulse (12‑pulse) converter or active filter Answer: D Explanation: Multi‑pulse converters or active harmonic filters reduce harmonic currents generated by VFDs, improving power quality. Question 11. Which motor type is commonly used for high‑rise gearless elevators because of its high torque density? A) Squirrel‑cage induction motor B) Permanent magnet synchronous motor (PMSM) C) Shaded‑pole motor D) Universal motor Answer: B Explanation: PMSMs provide high torque density and efficiency, making them ideal for gearless, high‑rise elevator applications. Question 12. In a regenerative braking system, the excess kinetic energy is returned to: A) The building’s main utility service via a bidirectional VFD B) A dedicated brake resistor bank only C) The elevator’s lighting circuit D) The car’s battery backup system Answer: A Explanation: Regenerative braking feeds energy back into the utility or building power system through a bidirectional VFD, improving efficiency. Question 13. Low‑voltage control circuits for elevators are typically limited to which maximum voltage? A) 12 VDC
Exam
B) 24 VDC or 120 VAC C) 277 VAC D) 480 VDC Answer: B Explanation: NEC 620.22 permits 24 VDC or 120 VAC for control circuits, ensuring safe isolation from the high‑power motor circuits. Question 14. Which component provides the timing function for door closing in a conventional electromechanical elevator control system? A) Variable frequency drive B) Timer relay (delay‑on‑release) C) Photocell sensor D) Hall‑effect position sensor Answer: B Explanation: Timer relays are used to provide a controlled delay for door closing sequences in conventional elevator controls. Question 15. A solid‑state controller in a modern elevator typically communicates with the VFD via: A) Analog 0‑ 10 V speed control B) Direct current (DC) motor leads C) Digital I/O or fieldbus (e.g., EtherNet/IP) D) Mechanical cam switches Answer: C Explanation: Modern controllers use digital I/O or fieldbus protocols to exchange speed commands and status with the VFD. Question 16. The series safety circuit required by NEC 620.51 must include which of the following devices? A) Pit stop switch, hoistway door lock, slack rope switch, final limit switch B) Fire alarm pull station, emergency stop button, smoke detector, UPS
Exam
Answer: B Explanation: NFPA 72 specifies the requirements for fire alarm system connections, including the elevator Phase I recall interface. Question 20. The required placement of smoke detectors for elevator fire service is: A) Only in the machine room ceiling B) In the machine room and each elevator lobby, per FBC and NFPA 72 C) Inside the car cab on the ceiling D) Only in the building’s central fire alarm control panel Answer: B Explanation: Both the Florida Building Code and NFPA 72 require smoke detectors in the machine room and elevator lobby areas to trigger Phase I recall. Question 21. NEC 620.21 permits traveling cables to be of which construction for elevator car connections? A) Flat‑type multi‑conductor cable only B) Round‑type cable with a minimum 2 mm² conductor cross‑section C) Either flat or round, provided they are listed for hoistway use and have proper strain relief D) Any type of cable as long as it is rated 600 V Answer: C Explanation: NEC 620.21 allows both flat and round traveling cables, provided they are listed for hoistway use and are properly secured and strain‑relieved. Question 22. The Car Operating Panel (COP) must be powered from a dedicated circuit that is: A) Shared with the hall call panel to reduce wiring B) Isolated from the motor power circuit and protected by a separate OCPD C) Connected directly to the main service disconnect D) Supplied through the same conduit as the traveling cable power conductors Answer: B
Exam
Explanation: The COP is a low‑voltage control circuit and must be isolated from the high‑current motor circuit, with its own over‑current protection. Question 23. According to ASME A17.1, audible signaling devices in the car must be: A) No louder than 70 dB at 3 ft B) Capable of providing a minimum of 85 dB at the occupant’s ear level C) Only activated during fire recall D) Powered from the emergency battery only Answer: B Explanation: ASME A17.1 requires audible signals to be at least 85 dB at the occupant’s ear level for accessibility compliance. Question 24. Which conduit type is prohibited for use within the elevator hoistway due to its lack of impact resistance? A) Rigid metal conduit (RMC) B) Rigid non‑metallic conduit (RNC) C) Electrical metallic tubing (EMT) D) Flexible metal conduit (FMC) Answer: C Explanation: EMT is not permitted in hoistways because it does not provide sufficient mechanical protection against impact. Question 25. When multiple elevators share a single service feeder, the demand factor applied per NEC 220.42 is: A) 100 % of the sum of all motor loads B) 80 % of the largest motor load only C) 50 % of the sum of the first two largest loads, then 25 % for each additional load D) 75 % of the total connected load Answer: C
Exam
Question 29. The minimum clearance between a traveling cable and any moving part of the hoistway, per NEC, is: A) 1 in. B) 3 in. C) 6 in. D) 12 in. Answer: B Explanation: NEC 620.21 requires a minimum of 3 in. clearance between traveling cables and moving parts to prevent abrasion. Question 30. During the rough‑in inspection, which of the following must be verified? A) Final paint color of the machine room walls B) Correct conduit fill, support spacing, and identification of all conductors C) Installation of decorative lighting in the car interior D) Programming of the elevator’s destination dispatch software Answer: B Explanation: Rough‑in inspections focus on the correctness of conduit fill, support, and conductor identification per NEC. Question 31. The NEC requires that all elevator control wiring be protected from physical damage by: A) Using armored cable only B) Installing conduit with a minimum 1 in. wall thickness C) Placing the wiring in a raceway or conduit appropriate for the environment D) Routing the wiring through the elevator shaft’s fire‑resistive walls only Answer: C Explanation: NEC 300.4 requires that control wiring be protected by an appropriate raceway or conduit to guard against physical damage. Question 32. Which of the following statements about the elevator’s emergency lighting is correct?
Exam
A) It must be powered from the same circuit as the machine room lighting B) It must be illuminated for a minimum of 90 minutes after loss of normal power C) It may be a simple incandescent bulb without a battery backup D) It is optional if the building has a central emergency lighting system Answer: B Explanation: ASME A17.1 requires emergency lighting to remain illuminated for at least 90 minutes after normal power loss. Question 33. A “slack rope switch” is used to: A) Detect excessive tension in the hoist ropes and shut down the motor B) Prevent the car from moving when the rope is slack, such as during a free‑fall condition C) Control the speed of the elevator during descent D) Provide a signal to the fire alarm system when the car is at the top floor Answer: B Explanation: The slack rope switch opens when the rope becomes slack, preventing motor operation that could exacerbate a free‑fall situation. Question 34. Which of the following devices is required to be installed in the car top to provide a secondary means of disconnect? A) A portable 15 A circuit breaker B) A motor‑rated disconnect switch with lockout capability C) A fused disconnect that is not required to be lockable D) No additional device is required if the main disconnect is present Answer: B Explanation: ASME A17.1 requires a motor‑rated disconnect with lockout capability at the car top for maintenance safety. Question 35. The purpose of a “final limit switch” in an elevator system is to: A) Indicate when the car has reached the top or bottom landing for precise stopping B) Provide a backup power source for the car’s lighting
Exam
D) The elevator’s maximum speed in feet per second Answer: B Explanation: NEC 620.22 mandates clear labeling of voltage, phase, amperage, and circuit function on control panels for safety and maintenance. Question 39. Which of the following is the correct method for terminating a shielded VFD motor cable to minimize electromagnetic interference (EMI)? A) Leave the shield unconnected to avoid ground loops B) Connect the shield to neutral at the motor end only C) Bond the shield to ground at both the VFD and motor ends D) Bond the shield to ground at the VFD end only, leaving the motor end floating Answer: D Explanation: To prevent ground loops, the shield is typically bonded at the VFD (source) end only, leaving the motor end unconnected. Question 40. In a multiple‑elevator building, the minimum required separation between two independent elevator machine rooms is: A) 3 ft B) 6 ft C) 10 ft D) No specific separation is required if firewalls are present Answer: D Explanation: NEC does not prescribe a specific distance; separation is governed by fire‑rating requirements of the walls and ceilings separating the rooms. Question 41. Which of the following is the correct procedure for testing the continuity of the pit stop switch? A) Apply 120 V across the switch and verify voltage drop B) Use a multimeter set to continuity mode, confirming a closed circuit when the car is not in the pit C) Measure the resistance while the car is moving between floors
Exam
D) Perform a high‑potential (hipot) test at 1500 V Answer: B Explanation: Continuity testing with a multimeter confirms that the pit stop switch is closed (conducting) when the car is not in the pit. Question 42. Which NEC article governs the installation of GFCI protection for receptacles in the elevator machine room? A) Article 210.8(A)(2) – GFCI for locations within 6 ft of water B) Article 210.8(A)(1) – GFCI for bathrooms C) Article 210.8(A)(9) – GFCI for commercial kitchens D) Article 210.8(A)(10) – GFCI for outdoor locations Answer: A Explanation: NEC 210.8(A)(2) requires GFCI protection for receptacles in locations within 6 ft of water, which includes machine rooms that may have moisture. Question 43. The “door lock monitoring” circuit must be configured to: A) Allow the motor to run if any door is open, for safety B) Prevent elevator operation unless all hoistway and car doors are locked and closed C) Disable the fire alarm system when doors are locked D) Provide a visual indicator only, with no interlock function Answer: B Explanation: Door lock monitoring interlocks ensure the elevator cannot move unless all doors are properly locked and closed, per NEC 620.51. Question 44. Which of the following is a required feature of the elevator’s emergency communication system? A) Must be a two‑way voice system compliant with ASME A17.1, Chapter 5 B) Can be a simple buzzer that sounds when the car stops C) Needs only a visual indicator for the operator D) Must be powered solely by the building’s fire alarm system
Exam
Explanation: Phase loss protection must quickly shut down the VFD to prevent motor damage; the typical requirement is a trip within 0.5 seconds. Question 48. The NEC requires that all elevator pit lighting be provided with: A) A 120 V, 15 A branch circuit with a dedicated breaker B) A low‑voltage (24 VDC) system only C) A battery‑backed emergency source that activates on loss of normal power D) No specific requirement; any lighting method is acceptable Answer: C Explanation: Pit lighting must remain illuminated during power loss; therefore a battery‑backed emergency source is required per NEC 620.21. Question 49. Which of the following is the correct method for installing a VFD in an elevator machine room to reduce exposure to dust and debris? A) Mount the VFD on a wall without a protective enclosure B) Install the VFD inside a NEMA 4X rated enclosure C) Place the VFD on the floor directly under the motor D) Use a metal box without any rating Answer: B Explanation: A NEMA 4X enclosure provides protection against dust, water, and corrosion, suitable for machine room environments. Question 50. According to ASME A17.1, the minimum height for the car‑top disconnect lever (or switch) from the car floor is: A) 48 in. B) 54 in. C) 60 in. D) 72 in. Answer: C
Exam
Explanation: ASME A17.1 specifies a minimum height of 60 in. for the car‑top disconnect to be within reach of maintenance personnel. Question 51. Which of the following is required to be installed on the elevator’s main power feeder to detect a ground fault? A) A ground‑fault circuit interrupter (GFCI) breaker B) A residual‑current device (RCD) rated for 30 mA C) A line‑reactor with built‑in fault detection D) Ground fault detection is not required on the main feeder Answer: B Explanation: NEC 620.53 allows the use of an RCD (residual‑current device) to provide ground‑fault protection on the main feeder. Question 52. When performing insulation resistance testing on elevator wiring, the minimum acceptable resistance value is: A) 1 MΩ B) 2 MΩ C) 5 MΩ D) 10 MΩ Answer: C Explanation: NEC 620.22 recommends a minimum of 5 MΩ insulation resistance for control circuits to ensure adequate isolation. Question 53. The “final limit switch” is typically wired in series with which other safety device? A) Pit stop switch B) Car‑top disconnect C) Hall call button D) Emergency power transfer switch Answer: A
Exam
Explanation: NEC 620.22 mandates clear identification of voltage, phase, and function at each termination for control wiring. Question 57. In a dual‑motor elevator system, the feeder conductors must be sized to carry: A) The full load current of both motors simultaneously B) Only the larger motor’s full load current, because the smaller motor never runs together C) 125 % of the larger motor’s full load current, per NEC 430. D) 150 % of the sum of both motors’ locked‑rotor currents Answer: A Explanation: Dual‑motor systems can operate both motors simultaneously; therefore, the feeder must accommodate the combined full load current. Question 58. Which of the following is a required feature of the elevator’s fire‑fighter service interface according to NFPA 72? A) A dedicated 24 VDC power supply B) A normally‑open (NO) relay contact that closes on fire alarm activation C) A hard‑wired, non‑programmable logic module only D) A wireless transmitter that sends a recall signal to the car controller Answer: B Explanation: NFPA 72 specifies a normally‑open relay that closes when the fire alarm initiates Phase I recall. Question 59. The NEC permits the use of “flexible metal conduit” (FMC) in the elevator machine room for which of the following applications? A) Main power feeder to the motor B) Control wiring that is less than 30 ft in length and not subject to physical damage C) Traveling cable runs between car and machine room D) All of the above Answer: B
Exam
Explanation: FMC can be used for short, low‑risk control wiring runs, but not for main power feeders or traveling cables. Question 60. Which of the following statements about “phase reversal protection” for a three‑phase VFD is correct? A) It is optional if the VFD has built‑in overload protection B) It must disconnect the VFD within 0.2 seconds of detecting a reversal C) It can be satisfied by a simple manual switch D) It is not required for elevators because the motor will not run in reverse Answer: B Explanation: Phase reversal protection must act quickly (typically within 0.2 seconds) to prevent damage to the motor and VFD. Question 61. According to ASME A17.1, the minimum illumination level required in the machine room is: A) 5 lux measured at floor level B) 10 lux measured on the work plane C) 15 lux measured at the controller panel D) 30 lux measured at the ceiling Answer: B Explanation: ASME A17.1 specifies a minimum of 10 lux on the work plane in the machine room for safe maintenance. Question 62. Which of the following is the correct method for grounding a VFD chassis in an elevator application? A) Connect the chassis to the building’s grounding electrode system with a 12‑AWG copper wire B) Bond the chassis to the motor frame only C) Use a dedicated grounding bus bar that is isolated from the building ground D) No grounding is required if the VFD is double‑insulated Answer: A
