Random Ques PEC 1

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  1. Transformers are rated in __.
  2. A __ is a certain type cartridge fuse that can be readily replaced.
    renewable fuse
  3. In the computation of the size of building wire, the PEC requires at least a certain percent increase must be added. What percent is this?
  4. The maximum total voltage drop on both feeders and branch circuits to the farthest outlet should not exceed __ percent of the supply voltage.
  5. The total load on any overcurrent device located in a panelboard shall not exceed __ percent of its rating where in normal operation the load will continue for 3 hours or more.
  6. A WYE-DELTA starter for a single voltage three phase SC induction motor would require the connection of a certain number of wires from the motor. How many wires would be needed?
    9 wires
  7. When the total connected load is operated simultaneously, the demand factor is ___.
  8. The maximum number of outlets permitted on 15- and 20-ampere branch circuits is ___ and ___ outlets, respectively.
    • 10
    • 13
  9. Open conductors shall not be supported on __.
  10. __ is NOT permitted as an equipment grounding conductor.
  11. The current-carrying conductors in cable bus shall have an insulation rating of __ or higher
  12. The combined cross-sectional area of all conductors or cables shall not exceed ___ percent of the cross-sectional area of the cell or header.
  13. Splices and taps shall be permitted within a wireway provided they are accessible. the conductors, including splices and taps, shall not fill the wireway to more than ___ percent of its area at the point.
  14. The Code is intended to be suitable for ___ application by governmental bodies that exercise legal jurisdiction over electrical installations, including signaling and communications systems, and for use by insurance inspectors.
  15. Where energized parts are exposed, the minimum clear work space shall not be less than  ____.
    2000 mm
  16. __ color shall NOT be used for the grounded circuit conductor.
  17. The magnitude of the reflected wave increases as the distance from the arrester increases. If the length of the conductor between the protected equipment and the surge arrester is short, the magnitude of the wave reflected through the equipment is minimized due to ___.
    separation effect
  18. One of the functions of an equipment grounding conductor is to provide a ___ impedance ground-fault path between a ground fault and the electrical source.
  19. The grounding conductor for secondary circuits of instrument transformers and for instrument cases shall NOT be smaller than ___ mm2 copper or ____ mm2 aluminum.
    • 3.5 mm2
    • 5.5 mm2
  20. For Circuits of 1kV and over conductors between the surge arrester and the line and the surge arrester and the grounding connection shall NOT be smaller than ____ mm2 copper.
    14 mm2
  21. Where one or more of the motors of the group are used for short-time, intermittent, periodic, or varying duty, the ampere rating of such motors to be used in the summation shall be for the highest rated motor, the greater of either the ampere rating or the largest continuous duty motor full-load current multiplied by ___ shall be used in the summation.
  22. Grounding autotransformers can either be ___ connected to 3-phase, 3-wire ungrounded systems for the purpose of creating a 3-phase, 4 wire distribution system providing a neutral reference for grounding purposes. Such transformers shall have a continuous per-phase current rating and a continuous neutral current rating except for ___.
    vertex grounded delta
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Random Ques PEC 1
2015-07-15 12:55:37
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