2023 Commercial Electrical Inspector – Practice Exam

1. What is the ampacity for 4/0 AWG copper conductor, Type PFA (200°C), installed in a raceway or cable in a 40°C (104°F) ambient temperature (3 CCC)?

2. When service-entrance conductors are installed in a cable tray, how must the cable tray be identified?

3. For buildings or structures supplied by additional feeders permitted under Common Supply Equipment (225.30(B)), how must all feeder disconnects supplying the building or structure be located?

4. Which conductor types listed in 310.10(B) are permitted for use in dry and damp locations?

5. How must the grounded conductor of a mineral-insulated, metal-sheathed cable (Type MI) be identified at the time of installation?

6. What type of ENT is required when exposed to the direct rays of the sun?

7. What is the required minimum rating for the single-phase, 125-volt receptacle outlet required for servicing heating, air-conditioning, and refrigeration equipment?

8. According to the notes for Table 400.4, which of the following flexible cord types is generally required to have individual conductors twisted together?

9. All exposed lamps in dressing or makeup areas that are less than 8 ft. from the floor shall be equipped with what specific protective device?

10. Which of the following is NOT listed as a construction material for EMT?

11. What type of protection must the branch-circuit distribution equipment installed in each relocatable structure include?

12. Which equipment is permitted to be connected to the supply side of the service disconnecting means?

13. When cables are installed in a pipe organ, how must they be secured?

14. Which circuit is permitted to be connected on the supply side of the service overcurrent device where separately provided with overcurrent protection?

15. Is Optional Standby System wiring permitted to occupy the same raceways, cables, boxes, and cabinets as other general wiring?

16. In addition to the required overcurrent device, an automatic circuit breaker actuated by a reverse-current relay set to open the circuit at not more than the rated secondary current of the transformer shall be provided in the secondary connection of which transformers?

17. For Flow Battery Systems, what means must be provided to prevent spills of electrolyte?

18. When must each run of cable tray be completed?

19. For fixed bends of metric designator 12 (trade size 3/8) FMT, what is the minimum radius (in mm) measured to the inside of the bend?

20. Except for multiwire circuits tapped at the load end, all conductors of a multiwire branch circuit shall originate from which location?

21. Where flammable gases or vapors are released from cannabis oil equipment (other than booths), what classification applies to the space inside a tank or container that contains a flammable material?

22. Where fuses rated 1200 amperes or higher are installed, the fuse must have a clearing time of what maximum duration at the available arcing current, or an approved equivalent means to reduce clearing time must be provided?

23. For a grounded system, if the substantial structure supporting service conductors over a roof is metal, it shall be bonded by means of a bonding jumper and listed connector to where?

24. What is a typical Class I, Group B material mentioned in the informational note?

25. For RTRC intended for use aboveground, what characteristic is required regarding heat?

26. What is the minimum required rating for the service disconnecting means supplying a one-family dwelling?

27. Where material is extracted from another standard, the use of soft conversion is permitted, provided the context of the original material is not:

28. When lampholders have terminals that puncture the insulation, they shall be attached only to conductors of which type?

29. Main contact conductors carried along runways shall be supported on insulating supports placed at intervals not exceeding what distance?

30. Which type of conductor in a cable or raceway is NOT required to have thermoset or thermoplastic insulation when installed in wet locations?

31. Flexible cords used on portable equipment shall be approved for what specific usage rating?

32. Conductors smaller than 8 AWG in open wiring on insulators must be rigidly supported at intervals not exceeding what maximum distance?

33. Equipment intended for Interconnection and Interactive operation with power production sources must meet which requirement?

34. Direct-buried cables that are not encased or protected by concrete and are buried 750 mm (30 in.) or more below grade must have their location identified by a warning ribbon placed how far above the cables?

35. If an industrial control panel is intended as service equipment, what marking is required?

36. Which specific occupancies are excluded from the requirement for commissioning of Energy Storage Systems (ESS) upon installation?

37. Guest rooms or guest suites in hotels, motels, and assisted living facilities that are provided with permanent provisions for cooking must have branch circuits installed to meet the rules for which occupancy type?

38. When replacing a non-grounding-type receptacle with a grounding-type receptacle in an existing installation lacking an EGC in the branch circuit, the EGC terminal may be connected to which accessible point?

39. Utilization equipment supplied by a rotary-phase converter must be controlled in such a manner that power to the equipment will be disconnected in the event of what?

40. What is the highest nominal system voltage specified for use in calculating branch-circuit and feeder loads, unless other voltages are specified?

41. If rock bottom is encountered during the installation of a rod or pipe electrode, what is the maximum oblique angle permitted?

42. What piece of information must a capacitor nameplate provide regarding discharge?

43. Insulation on conductors for non-power-limited remote-control and signaling circuits shall be rated for the system voltage and not less than what minimum voltage?

44. Nonmetallic enclosures are permitted to be installed without the required airspace on which surfaces?

45. Type S adapters shall be designed so that once inserted in a fuseholder, they cannot be what?

46. Where must the receptacle for an in-sink waste disposer cord-and-plug connection be located?

47. When installing metallic electrical equipment (rated 50V to 1000V) in locations where physical damage is likely, what strength requirement applies to the enclosures or guards?

48. When applying ampacity adjustment factors, a grounding or bonding conductor shall be counted when applying the provisions of 310.15(C)(1). True or False?

49. What is the minimum operating voltage at which ungrounded AC systems (50V to 1000V) permitted by 250.21(A)(1) through (A)(4) must have ground detectors installed?

50. The optional school calculation method (220.86) shall NOT apply to which buildings?

51. For indoor use, which enclosure type provides protection against oil and coolant seepage, circulating dust, and falling liquids, but does NOT protect against hosedown?

52. A listed Class A GFCI device providing personnel protection must be installed in which type of location?

53. Splices and taps in strut-type channel raceways are permitted provided the conductors, including splices and taps, do not fill the raceway to more than what percentage of its area?

54. What is the maximum length of unsecured LFNC permitted for connections within an accessible ceiling to a luminaire(s) or other equipment from the last point where the raceway is securely fastened?

55. The closing rating of a circuit breaker shall not be less than what type of fault current?

56. When installing Class 2 and Class 3 Circuit conductors in enclosures with electric light or power circuits, what minimum separation distance must be maintained if voltage is not 150 volts or less to ground?

57. What is the minimum nominal discharge current rating (In) required for a surge-protective device (SPD) installed on a feeder supplying a dwelling unit?

58. All high-voltage parts of X-ray equipment, including X-ray tubes, must be mounted within what type of enclosure?

59. The Solar PV system disconnecting means must have sufficient ratings for the maximum circuit current, available fault current, and what other electrical property available at its terminals?

60. All shields on portable power feeder cables over 2000Volts shall be grounded at least at what location?

61. What minimum height must the floor, grade, or platform level working space extend to in front of electrical equipment operating at 1000 volts, nominal, or less?

62. For an instantaneous-trip circuit breaker used with motors other than design B energy-efficient and Design B premium efficiency motors, if the setting specified in Table 430.52(text{C})(1) is not sufficient, the setting shall be permitted to be increased but shall in no case exceed what maximum percentage of the motor full-load current?

63. Where wet contact is likely to occur, ungrounded 2-wire DC control circuits are limited to 30 volts maximum for continuous DC, or what maximum peak voltage if the direct current is interrupted at a rate of 10 to 200 Hz?

64. In supervised industrial installations (Part VIII), where the overcurrent device is rated over 800 amperes, the ampacity of the conductors it protects shall be equal to or greater than what percentage of the rating of the overcurrent device?

65. How many minimum volt-amperes must be calculated for each required branch circuit supplying sign and outline lighting?

66. What is the ampacity for 4/0 AWG aluminum conductor, Type XHHW-2, installed in a raceway or earth (direct buried) under standard conditions (30°C ambient, 3 CCC)?

67. Horticultural lighting equipment shall not be installed where it is likely to be subject to physical damage or where it is what?

68. If metal raceway or metal cable tray is used to connect auxiliary equipment mounted on an energized surface, what must be installed to prevent a potentially hazardous electrical condition?

69. Strut-type channel raceways and accessories shall be formed of which materials?

70. Which color shall the identification of terminals to which a grounded conductor is to be connected be in devices or utilization equipment with polarized connections?

71. All heating elements that are replaceable in the field and are part of an electric heater must be legibly marked with the ratings in volts and watts or in what other rating unit?

72. If multiple grounding connections result in objectionable current, and the effective ground-fault current path requirements are met, which remedial action is permitted?

73. Low-voltage lighting systems must be installed not less than what minimum horizontal distance from the nearest edge of the water of a pool, spa, fountain, or similar location, unless otherwise permitted?

74. Service overcurrent protective devices must be current limiting for solidly grounded wye services not exceeding 1000 volts phase-to-phase, if the available fault current is greater than what value?

75. For a branch circuit supplied from a dc system operating at more than 1500 volts, how shall an ungrounded conductor of 4 AWG or larger be identified at all termination, connection, and splice points?

76. What is the maximum current permitted for a 16 AWG Type SJTW multiconductor cord connected to utilization equipment so that only two conductors are current-carrying (Column B)?

77. What is the width requirement for the working space in front of electrical equipment?

78. Is flexible metal conduit (FMC) permitted to be reconditioned?

79. Where structural members do not readily permit fastening IMC within 900 mm (3 ft) of a termination point, fastening shall be permitted to be increased to what maximum distance?

80. If two or more branch circuits supply devices on the same yoke or mounting strap, what must be provided at the point where the branch circuits originate?