(PEC-Chapter3) Sheet1-Part1

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(PEC-Chapter3) Sheet1-Part1
2015-08-15 11:50:39
camille chapterthree

Chapter3 PEC
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  1. In both exposed and
    concealed locations, where a cable- or raceway-type wiring method is installed
    through bored holes in joists, rafters, or wood members, holes shall be bored
    so that the edge of the hole is not less than ___ mm from the nearest edge of
    the wood member. Where this distance cannot be maintained, the cable or raceway
    shall be protected from penetration by screws or nails by a steel plate or
    bushing, at least ___ mm thick, and of appropriate length and width installed
    to cover the area of the wiring
    • 30
    • 1.60
  2. Cable- or
    raceway-type wiring methods installed in a groove, to be covered by wallboard,
    siding, panelling, carpeting, or similar finish, shall be protected by ___ mm
    thick steel plate, sleeve, or equivalent or by not less than __ mm free space
    for the full length of the groove in which the cable or raceway is installed
    • 1.60
    • 30
  3. Where raceways
    containing ungrounded conductors __ mm2 or larger enter a cabinet, box
    enclosure, or raceway, the conductors shall be protected by a substantial
    fitting providing a smoothly rounded insulating surface, unless the conductors
    are separated from the fitting or raceway by substantial insulating material
    that is securely fastened in place.
  4. Direct-buried
    conductors and enclosures emerging from grade shall be protected by enclosures
    or raceways extending from the minimum cover distance below grade required by to a point at least ___ mm above finished grade. In no case shall
    the protection be required to exceed ___ mm below finished grade
    • 2 400
    • 450
  5. Underground service
    conductors that are not encased in concrete and that are buried ___ mm or more
    below grade shall have their location identified by a warning ribbon that is
    placed in the trench at least ___ mm above the underground installation
    • 450
    • 300
  6. In portions of dairy
    processing facilities, laundries, canneries, and other indoor wet locations,
    and in locations where walls are frequently washed or where there are surfaces
    of absorbent materials, such as damp paper or wood, the entire wiring system,
    where installed exposed, including all boxes, fittings, raceways, and cable
    used therewith, shall be mounted so that there is at least a __ mm airspace
    between it and the wall or supporting surface
  7. Raceways shall be
    provided with expansion fittings where necessary to compensate for ___ and ___
    • thermal expansion
    • contraction
  8. ___ is defined as the shortest distance in
    millimetres (inches) measured between a point on the top surface of any
    direct-buried conductor, cable, conduit, or other raceway and the top surface
    of finished grade, concrete, or similar cover
  9. What is the minimum cover distance of a directly buried cable under minimum of 100mm
    thick concrete exterior slab with no vehicular traffic and with the slab
    extending not less than 150mm beyond the underground installation?
  10. The cover distance of
    conductors installed in a rigid metal conduit in or under airport runways,
    including adjacent areas where trespassing is prohibited shall be a minimum of
    _____ mm
  11. ___ and ___
    shall not be supported by ceiling grids
    • Cables
    • raceways
  12. At least ___ mm of
    free conductor, measured from the point in the box where it emerges from its
    raceway or cable sheath, shall be left at each outlet, junction, and switch
    point for splices or the connection of luminaires (fixtures) or devices. Where
    the opening to an outlet, junction, or switch point is less than 200 mm in any
    dimension, each conductor shall be long enough to extend at least __ mm outside
    the opening
    • 150
    • 75
  13. A ___ shall be
    installed at each outlet and switch point for concealed knob-and-tube wiring
  14. An intermediate metal
    conduit is mounted vertically containing 5.5 mm2 conductors, what must be the
    necessary support intervals of the mentioned conductors?
    Not greater than 30m aluminum or copper-clad aluminum & copper
  15. Flexible metal
    conduit shall be permitted, in lengths not to exceed ___ mm, to connect
    physically adjustable equipment and devices permitted to be in these ducts and
    plenum chambers. The connectors used with flexible metal conduit shall
    effectively close any openings in the connection.
    1 200
  16. (Requirements for Over 600 Volts, Nominal ) The conductor shall not be bent to a radius less than ___ times the overall diameter for nonshielded conductors or ___ times the
    overall diameter for shielded or lead covered conductors during or after
    • 8
    • 12
  17. Exposed runs of
    braid-covered insulated conductors shall have a flame-retardant braid. If the
    conductors used do not have this protection, a flame-retardant saturant shall
    be applied to the braid covering after installation. This treated braid
    covering shall be stripped back a safe distance at conductor terminals,
    according to the operating voltage. Where practicable, this distance shall not
    be less than ___ mm for each kilovolt of the conductor-to-ground voltage of the
  18. (CONDUCTORS FOR GENERAL WIRING) Conductors shall be ___.
  19. Where installed in
    raceways, conductors of size ___ and larger shall be stranded
    8.0 mm2 (3.2 mm dia.)
  20. Aluminum, copper-clad
    aluminum, or copper conductors of size ___ mm2 and larger, comprising each
    phase, polarity, neutral, or grounded circuit conductor, shall be permitted to
    be connected in parallel (electrically joined at both ends)
  21. Exception No. 2: Conductors in
    sizes smaller than ___ mm2 shall be permitted to be run in parallel to supply
    control power to indicating instruments, contactors, relays, solenoids, and
    similar control devices, provided all of the conditions specified are met
  22. Exception No. 3: Conductors in
    sizes smaller than __ mm2 shall be permitted to be run in parallel for
    frequencies of ___ Hz and higher where conditions (a), (b), and (c) of
    Exception No. 2 are met
    • 50
    • 360
  23. Exception No. 4: Under the
    supervision of a licensed electrical engineer, grounded neutral conductors in
    sizes ___ mm2 and larger shall be permitted to be run in parallel for existing
  24. What is the minimum size of conductors (copper ,aluminum, copper-clad
    aluminum) for conductor voltage rating of 
    • Copper - 2.0mm(1.6mm dia.)
    • Aluminum or Copper-clad Aluminum - 3.5mm2 (2.0mm dia.)
  25. Solid dielectric
    insulated conductors operated above ___ volts in permanent installations shall
    have ozone-resistant insulation and shall be shielded
  26. FPN No. 2: Conductors
    installed in conduit exposed to direct sunlight in close proximity to rooftops
    have been shown, under certain conditions, to experience a temperature rise of
    ___ above ambient temperature on which the ampacity is based
    17°C (30°F)
  27. The size in mm2 or mm
    diameter shall be repeated at intervals not exceeding ___ mm. All other
    markings shall be repeated at intervals not exceeding ___ mm
    • 600
    • 1 000
  28. Cite the 3 methods of
    conductor marking
    • 1. Surface Marking
    • 2. Marker Tape
    • 3. Tag Marking
  29. (Suffixes to
    Designate Number of Conductors) A type letter orletters used alone shall indicate a single insulated conductor. The letter
    suffixes shall be indicated as follows:

      (1) ____ - For two insulated
    conductors laid parallel within an outer non-metallic covering

      (2) ____-For an assembly of two
    or more insulated conductors twisted spirally within an outer non-metallic covering.
    • D
    • M
  30. FPN: Thermoplastic
    insulation may stiffen at temperatures lower than ____. Thermoplastic
    insulation may also be deformed at normal temperatures were subjected to
    pressure, such as at points of support. Thermoplastic insulation, where used on
    dc circuits in wet locations, may result in electro-endosmosis between
    conductor and insulation
    -10°C (+14°F)
  31. (Selection of
    Ampacity) Where more than one calculated or tabulated ampacity could apply for
    a given circuit length, the ____ value shall be used
  32. Exception: Where two different ampacities apply to adjacent portions of
    a circuit, the higher ampacity shall be permitted to be used beyond the point
    of transition, a distance equal to ___ mm or ___ percent of the circuit length
    figured at the higher ampacity, whichever is less
    • 3 000
    • 10
  33. Where the number of
    current-carrying conductors in a raceway or cable exceeds three, or where
    single conductors or multiconductor cables are stacked or bundled longer than
    ___ mm without maintaining spacing and are not installed in raceways, the
    allowable ampacity of each conductor shall be reduced as shown in Table Each current-carrying conductor of a paralleled set of
    conductors shall be counted as a current-carrying conductor
  34. Exception No. 3: Derating factors shall not apply to conductors in
    nipples having a length not exceeding ___ mm
  35. Exception No. 4: Derating factors shall not apply to underground
    conductors entering or leaving an outdoor trench if those conductors have
    physical protection in the form of rigid metal conduit, intermediate metal
    conduit, or rigid nonmetallic conduit having a length not exceeding ___ mm
    and if the number of conductors does not exceed ___
    • 3 000
    • four
  36. (Exception No. 5 cont.) A ___ percent adjustment factor shall be applied
    where the current carrying conductors in these cables that are stacked or
    bundled longer than ___ mm without maintaining spacing exceeds 20
    • 60
    • 600
  37. The Adjustment factor for 8 conductors installed in a raceway is ___%
  38. ________. As used in
    this Code, the heat transfer capability through a substance by conduction. It
    is the reciprocal of thermal conductivity and is designated Rho and expressed
    in the units °C-cm/watt.
    Thermal Resistivity