• Test Your Code IQ — July 2024

    How much do you know about the National Electrical Code?
    July 17, 2024
    3 min read

    Courtesy of www.MikeHolt.com.

    All questions and answers are based on the 2023 NEC.

    Q1: The number of receptacle outlets for guest rooms in hotels and motels shall not be less than that required for a dwelling unit. These receptacles shall be located to be convenient for permanent furniture layout, but at least _____ receptacle outlet(s) shall be readily accessible.

    a) one

    b) two

    c) three

    d) four

     

    Q2: Dry-type transformers 1,000V nominal or less and not exceeding _____ that are installed in hollow spaces of buildings and not permanently closed in by the structure, shall not be required to be readily accessible.

    a) 10kVA

    b) 25kVA

    c) 50kVA

    d) 112.50kVA

     

    Q3: Each multiconductor cable installed in conduit in a Class I, Division 1 location shall be considered as a single conductor if the cable is incapable of transmitting _____ through the cable core.

    a) gases or vapors

    b) dust

    c) flyings

    d) any of these

     

    Q4: The minimum service-entrance conductor size shall have an ampacity not less than the maximum load to be served after the application of any _____ factors.

    a) adjustment

    b) correction

    c) demand

    d) adjustment or correction

     

    Q5: If the grounding electrode conductor to a ground rod does not extend to other types of electrodes, the grounding electrode conductor shall not be required to be larger than _____ copper wire.

    a) 10 AWG

    b) 8 AWG

    c) 6 AWG

    d) 4 AWG

     

    Q6: For PV system rapid shutdown systems, controlled conductors located outside the array boundary or more than 3 ft from the point of entry inside a building shall be limited to not more than _____ within 30 seconds of rapid shutdown initiation. 

    a) 80V

    b) 50V

    c) 30V

    d) 15V

     

    Answers:

    Q1: b) two

    As stated in Sec. 210.60(B), "At least two receptacle outlets shall be readily accessible."

    Q2: c) 50kVA

    Section 450.13(B) confirms, "Dry-type transformers 1,000V, nominal, or less and not exceeding 50kVA shall be permitted in hollow spaces of buildings not permanently closed in by structure, provided they meet the ventilation requirements of Sec. 450.9 and separation from combustible materials requirements of Sec. 450.21(A). Transformers so installed shall not be required to be readily accessible."

    Q3: a) gases or vapors

    Per Sec. 501.15(D)(3): "Each multiconductor cable installed in conduit shall be considered as a single conductor if the cable is incapable of transmitting gases or vapors through the cable core."

    Q4: d) adjustment or correction

    According to Sec. 230.42(A)(2), “The minimum service-entrance conductor size shall have an ampacity not less than the maximum load to be served after the application of any adjustment or correction factors.”

    Q5: c) 6 AWG

    Section 250.66(A) confirms that the grounding electrode conductor shall not be required to be larger than 6 AWG copper wire if the grounding electrode conductor to a ground rod does not extend to other types of electrodes.

    Q6: c) 30V

    Per Sec. 690.12(B)(1): "Controlled conductors located outside the boundary or more than 3 ft from the point of entry inside a building shall be limited to not more than 30V within 30 seconds of rapid shutdown initiation." 

    These materials are provided by Mike Holt Enterprises in Leesburg, Fla. To view Code training materials offered by this company, visit www.mikeholt.com/code.

    About the Author

    Mike Holt

    Mike Holt is the owner of Mike Holt Enterprises (www.MikeHolt.com), one of the largest electrical publishers in the United States. He earned a master's degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to produce seminars, videos, books, and online training for the trade as well as contribute monthly Code content to EC&M magazine.

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