Commercial Wiring - Part 1

17 Questions | Total Attempts: 695

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Commercial Wiring - Part 1 - Quiz

This Quiz is created to quantify commercial electric wiring and its terms, talking about Prints, load calculations, branch circuits, switches and receptacles and box calculations


Questions and Answers
  • 1. 
    What is wet location?
  • 2. 
    What section of the specification contains a list of contract documents?
    • A. 

      Specifications blog

    • B. 

      General conditions

    • C. 

      Electrical Layouts

    • D. 

      Symbol Schedule

  • 3. 
    The  requirements for temporary light and power at the job site will be found in what portion of the specification?
    • A. 

      Supplementary general condition

    • B. 

      Elevations

    • C. 

      Details

    • D. 

      Site plan

  • 4. 
     A Standard Ampere rating for fuse and fixed trip circuit breaker is ..?
    • A. 

      12

    • B. 

      20

    • C. 

      45

    • D. 

      33

    • E. 

      62

  • 5. 
    What is the correct unit load according to table 220.12 NEC for a schoolroom  and corridor school?
    • A. 

      3 VA/sqft

    • B. 

      0.5 VA/sqft

    • C. 

      1 VA/sqft

    • D. 

      3 1/2 VA/sqft

    • E. 

      3 VA/Sqm

  • 6. 
    Can an increase in the nonlinear load affect on FEEDERS serving the area?
    • A. 

      Yes

    • B. 

      No

  • 7. 
    A School Building has 80 ft x 50 ft. with 4 classrooms, each 40 ft x 20 ft, and a corridor that is 80x 10 ft wide. Each classroom  has: 12 fluorescent 2ft by 4 ft @ 85 VA each, 20 duplex receptacles, 1 AC unit 208v, 1 phase @ 5000VA. Corridor: 5 fluorescent 1 ft x 8 ft @ 85 VA each, 8 duplex receptacles.  The calculated load is  ?
    • A. 

      10000

    • B. 

      11485

    • C. 

      9000

    • D. 

      12000

  • 8. 
    What THHN stands for?
  • 9. 
    Current-carrying conductors for purpose of derrating are the followings?
    • A. 

      All the current carrying wires

    • B. 

      Neutral of a 3-wire single phase circuit when the circuit is taken from a 4 wire, 3 phase wye system

    • C. 

      Equipment grounding conductors

    • D. 

      Neutral of 3 wire system , when neutral carries only unbalanced current

  • 10. 
    The metal yoke of an isolated grounding type receptacle is connected to the green equipment grounding terminal of the receptacle?
    • A. 

      True

    • B. 

      False

  • 11. 
    What is the maximum number of 6 AWG THW copper conductors permitted in a 1 in EMT?
    • A. 

      4

    • B. 

      5

    • C. 

      6

    • D. 

      3

  • 12. 
        Two “A” phase conductors, two “B” phase conductors, and two neutrals of a 120/208 V system are installed in an area with an ambient temperature installed of 30C. The conductors are 10 AWG THHN copper. What is the allowable ampacity of each current carrying conductor?
    • A. 

      32

    • B. 

      30

    • C. 

      40

    • D. 

      20

  • 13. 
    Determine the allowable ampacity of six 8 AWG THW copper conductors installed in EMT, in an ambient temperature of 30 C. All are current carrying conductors
    • A. 

      40

    • B. 

      30

    • C. 

      45

    • D. 

      50

  • 14. 
        What is the ampacity of a 1AWG THW copper conductor installed in a raceway in a location with the following ambient temperature?        55 C ambient temperature
    • A. 

      87.1

    • B. 

      90.1

    • C. 

      100.1

    • D. 

      80.1

  • 15. 
          A conductor’s ampacity is directly related to the type of insulation used on the conductor?  
    • A. 

      True

    • B. 

      False

  • 16. 
          Identify the following items as a device or fitting.   a)    Bushing:     Device                    Fitting
    • A. 

      Device

    • B. 

      Fitting

  • 17. 
       Table 310.16 lists the ampacity of a 10 AWG THHN copper conductor at _____ amps, but section 240.4 (D)(7) limits the overcurrent protection to ______ ?
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