(PEC-Chapter3) Sheet1-Part2

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Camskie
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304850
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(PEC-Chapter3) Sheet1-Part2
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2015-08-15 11:50:48
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camille chapterthree
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PEC Chapter3
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  1. Under engineering
    supervision, conductor ampacities shall be permitted to be calculated by means
    of the following general formula:
  2. Ampacities at ambient temperatures other than those shown in the tables shall be
    determined by means of the following formula:
  3. The minimum burial
    depths to top electrical ducts or cables shall be in accordance with section
    3.0.2.20. Maximum depth to the top of electrical duct banks shall be ___mm and
    the maximum depth to the top of direct buried cables shall be ___mm
    • 750
    • 900
  4. In damp or wet locations, surface type
    enclosures within the scope of this article shall be placed or equipped so as
    to prevent moisture or water from entering and accumulating within the cabinet
    or cut-out box, and shall be mounted so there is at least ___ mm airspace between
    the enclosure and the wall or other supporting surface
    6
  5. Exception: ___ enclosures shall be permitted to be installed
    without the airspace on a concrete, masonry, tile, or similar surface
    Nonmetallic
  6. In walls of concrete,
    tile, or other noncombustible material, cabinets shall be installed so that the
    front edge of the cabinet is not set back of the finished surface more than ___mm. In walls constructed of wood or other combustible material, cabinets shall
    be flush with the finished surface or project therefrom
    6
  7. Plaster, drywall, or
    plasterboard surfaces that are broken or incomplete shall be repaired so there
    will be no gaps or open spaces greater than ___ mm at the edge of the cabinet or
    cutout box employing a flush-type cover
    3
  8. Exception:
    Cables with entirely nonmetallic sheaths shall be permitted to enter the top of
    a surface-mounted enclosure through one or more nonflexible raceways not less
    than 450 mm and not more than 3 000 mm in length, provided all of the following
    conditions are met:

      (a) Each cable is fastened within ___ mm, measured along the sheath, of the outer
    end of the raceway.

      (b) The raceway extends directly above the enclosure and does not penetrate a
    structural ceiling.

      (c) A fitting is provided on each end of the raceway to protect the cable(s) from
    abrasion and the fittings remain
    accessible after installation.

      (d) The raceway is sealed or plugged at the outer end using approved means so as to
    prevent access to the enclosure
    through the raceway.

      (e) The cable sheath is continuous through the raceway and extends into the enclosure beyond the fitting not less than ___ mm.
    • 300
    • 6
  9. Table 3.12.1.6(a) Bending space at
    terminals shall be measured in a ___ line from the end of the lug or wire
    connector (in the direction that the wire leaves the terminal) to the wall,
    barrier, or obstruction
    straight
  10. FPN: ___ is the distance measured along the
    enclosure wall from the axis of the centerline of the terminal to a line
    passing through the center of the opening in the enclosure
    Offset
  11. Exception No. 2: A conductor not larger than ___ mm2 shall be permitted to enter or leave
    an enclosure containing only a meter socket(s) through the wall opposite its
    terminal, provided the distance between the terminal and the opposite wall is
    not less than that specified in Table 3.12.1.6(a) and the terminal is a lay-in
    type, where the terminal is either of the following:

    (a) Directed toward the opening in the enclosure and within a ___ degree angle of
    directly facing the enclosure wall

    (b) Directly facing the enclosure wall and offset not greater than ___ percent of the bending space specified in Table 3.12.1.6(a)
    • 175
    • 45
    • 50
  12. Enclosures for switches or overcurrent devices shall not be used as junction boxes, auxiliary
    gutters, or raceways for conductors feeding through or tapping off to other
    switches or overcurrent devices, unless adequate space for this purpose is
    provided. The conductors shall not fill the wiring space at any cross section
    to more than ___ percent of the cross-sectional area of the space, and the
    conductors, splices, and taps shall not fill the wiring space at any cross
    section to more than ___ percent of the cross-sectional area of that space.
    • 40
    • 75
  13. (Cabinets, cutout boxes, and meter socket Enclosures Construction Specifications)

    The design and construction of enclosures within the
    scope of this article shall be such as to secure ample strength and rigidity.
    If constructed of sheet steel, the metal thickness shall not be less than ___ mm uncoated
    • 1.35
    • (0.053 in.)
  14. (Spacing within cabinets and
    cutout boxes)

    Other than at points of support, there shall be an airspace of at
    least ___ mm between the base of the device and the wall of any metal cabinet
    or cutout box in which the device is mounted.
    1.60
  15. There shall be
    airspace of at least ___ mm between any live metal part, including live metal
    parts of enclosed fuses, and the door
    25
  16. Exception: Where the door is lined with an approved insulating material
    or is of a thickness of metal not less than ___ mm uncoated, the airspace
    shall not be less than ___ mm
    • 2.35
    • 13
  17. There shall be an
    airspace of at least ___ mm between the walls, back, gutter partition, if of
    metal, or door of any cabinet or cutout box and the nearest exposed
    current-carrying part of devices mounted within the cabinet where the voltage
    does not exceed ___. This spacing shall be increased to at least ___ mm for
    voltages of 251 to 600, nominal
    • 13
    • 250
    • 25
  18. Cabinets and cutout
    boxes shall be deep enough to allow the closing of the doors when ___-ampere
    branchcircuitpanelboard switches are in any position, when combination cutout
    switches are in any position, or when other single-throw switches are opened as
    far as their construction permits
    30
  19. Cabinets and cutout
    boxes that contain devices or apparatus connected within the cabinet or box to
    more than ___ conductors, including those of branch circuits, meter loops,
    feeder circuits, power circuits, and similar circuits, but not including the
    supply circuit or a continuation thereof, shall have back-wiring spaces or one
    or more side-wiring spaces, side gutters, or wiring compartments
    eight
  20. ___ shall not be used where conduits
    or connectors requiring the use of locknuts or bushings are to be connected to
    the side of the box
    Round boxes
  21. ___ shall be permitted only with open wiring on insulators, concealed knob-and-tube
    wiring, cabled wiring methods with entirely nonmetallic sheaths, flexible
    cords, and nonmetallic raceways
    Nonmetallic boxes
  22. Conduit bodies such
    as capped elbows and service-entrance elbows that enclose conductors ___ mm2 or
    smaller, and are only intended to enable the installation of the raceway and
    the contained conductors, shall not contain splices, taps, or devices and shall
    be of sufficient size to provide free space for all conductors enclosed in the
    conduit body
    14
  23. (Box Fill Calculations)

    Exception: An equipment grounding conductor or
    conductors or not over four fixture wires smaller than ___, or both, shall be permitted to be omitted from the calculations where they enter a box from a domed luminaire (fixture) or similar canopy and terminate within that box
    2.0 mm(1.6 mm dia.)
  24. (Box Fill Calculations)

    Where one or more internal cable clamps, whether
    factory or field supplied, are present in the box, a single volume allowance in
    accordance with Table 3.14.2.2(b) shall be made based on the ___ conductor
    present in the box. No allowance shall be required for a cable connector with
    its clamping mechanism outside the box
    largest
  25. Where one or more luminaire (fixture) studs or hickeys are present in the box, a ___ volume allowance in accordance with
    Table 3.14.2.2(b) shall be made for each type of fitting based on the largest
    conductor present in the box
    single
  26. For each yoke or strap containing one or more devices or equipment, a ___ volume allowance in accordance with Table
    3.14.2.2(b) shall be made for each yoke or strap based on the largest conductor
    connected to a device(s) or equipment supported by that yoke or strap
    double
  27. Where one or more
    equipment grounding conductors or equipment bonding jumpers enter a box, a
    ___ volume allowance in accordance with Table 3.14.2.2(b) shall be made
    based on the largest equipment grounding conductor or equipment bonding jumper
    present in the box
    single
  28. Based on table Table 3.14.2.2(b), what shall be the minimum volume allowance required per 2.0mm2 conductor in calculating the conductor
    fill in the box ?
    32 cm3
  29. Conduit bodies
    enclosing ___ conductors or smaller, other than short-radius conduit bodies
    as described in 3.14.1.5, shall have a cross-sectional area not less than twice
    the cross-sectional area of the largest conduit or tubing to which it is
    attached
    14 mm2
  30. Where metal boxes or
    conduit bodies are installed with messenger supported wiring, open wiring on
    insulators, or concealed knob-and-tube wiring, conductors shall enter through
    insulating bushings or, in dry locations, through flexible tubing extending
    from the last insulating support to not less than ___ mm inside the box and
    beyond any cable clamps
    6
  31. Exception: Where nonmetallic-sheathed cable or multiconductor Type UF
    cable is used with single gang boxes not larger than a nominal size ___ mm × ___ mm mounted in walls or ceilings, and where the cable is fastened within ___ mm
    of the box measured along the sheath and where the sheath extends through a
    cable knockout not less than ___ mm, securing the cable to the box shall not be
    required
    • 57
    • 100
    • 200
    • 6
  32. In walls or ceilings with a surface of
    concrete, tile, gypsum, plaster, or other noncombustible material, boxes
    employing a flush-type cover or faceplate shall be installed so that the front
    edge of the box, plaster ring, extension ring, or listed extender will not be
    set back of the finished surface more than ___ mm
    6
  33. Plaster, drywall, or plasterboard surfaces
    that are broken or incomplete around boxes employing a flush-type cover or
    faceplate shall be repaired so there will be no gaps or open spaces greater
    than ___ mm at the edge of the box
    3
  34. Nails and screws,
    where used as a fastening means, shall be attached by using brackets on the
    outside of the enclosure, or they shall pass through the interior within ___ mm
    of the back or ends of the enclosure. Screws shall not be permitted to pass
    through the box unless exposed threads in the box are protected using approved
    means to avoid abrasion of conductor insulation
    6
  35. Metal braces shall be
    protected against corrosion and formed from metal that is not less than ___ mm
    thick uncoated. Wood braces shall have a cross section not less than nominal
    ___mm × ___ mm
    • 0.50
    • 25
    • 50
  36. An enclosure mounted to structural or supporting elements of a suspended ceiling
    shall be not more than ___ cm3 in size and shall be securely fastened in place
    in accordance with either (d)(1) or (d)(2)
    1650
  37. An
    enclosure that contains a device(s),
    other than splicing devices, or supports a luminaire(s) [fixture(s)],
    lampholder, or other equipment and is supported by entering raceways shall not
    exceed ___ cm3 in size. It shall have threaded entries or have
    hubs identified for the purpose. It shall be supported by two or more conduits
    threaded wrenchtight into the enclosure or hubs. Each conduit shall be secured
    within ___ mm of the enclosure
    • 1650
    • 450
  38. Exception No. 2: An unbroken length(s) of rigid or intermediate metal conduit shall be
    permitted to support a box used for luminaire (fixture) or lampholder support,
    or to support a wiring enclosure that is an integral part of a luminaire
    (fixture) and used in lieu of a box in accordance with 3.0.1.15(b), where all of the following conditions are met:

    (a) The conduit is securely fastened at a point so that the length of conduit
    beyond the last point of conduit support does not exceed ___ mm.

    (b) The unbroken conduit length before the last point of conduit support is ___ mm
    or greater, and that portion of the conduit is
    securely fastened at some point not less than 300 mm from its last point of support.

    (c) Where accessible to unqualified persons, the luminaire (fixture) or lampholder,
    measured to its lowest point, is at
    least ___ mm above grade or standing area and at least ___ mm measured horizontally to
    the 2 400 mm elevation from windows, doors, porches, fire escapes, or similar locations.

    (d) A luminaire (fixture) supported by a single conduit does not exceed ___ mm in
    any direction from the point of conduit
    entry.

     (e) The weight supported by any single conduit does not exceed ___kg

    (f) At the luminaire (fixture)
    or lampholder end, the conduit(s) is threaded wrenchtight into the box, conduit body, or integral wiring enclosure, or into hubs identified for the purpose. Where a box or   conduit body is used for support, the luminaire (fixture) shall be secured directly to the box or conduit body, or through a
    threaded conduit nipple not over ___ mm long
    • 900
    • 300
    • 2 400
    • 900
    • 300
    • 9
    • 75
  39. (Pendant Boxes)

    Where supported by only a single conduit, the threaded joints shall be prevented from
    loosening by the use of set-screws or other effective means, or the luminaire
    (fixture), at any point, shall be at least ___ mm above grade or standing
    area and at least ___ mm measured horizontally to the 2 400 mm elevation from windows, doors, porches, fire escapes, or
    similar locations. A luminaire (fixture) supported by a single conduit shall
    not exceed ___ mm in any horizontal direction from the point of conduit entry
    • 2 400
    • 900
    • 300
  40. No box shall have an
    internal depth of less than ___ mm. Boxes intended to enclose flush devices
    shall have an internal depth of not less than ___mm
    • 13
    • 24
  41. Exception: A wall-mounted luminaire
    (fixture) weighing not more than ___ kg shall be permitted to be supported on other boxes or plaster rings that are secured to other boxes, provided the luminaire (fixture) or its supporting yoke is secured to the box with no fewer than two No. ___ or larger screws
    • 3
    • 6
  42. Outlet boxes or fittings
    installed as required by 3.14.2.9 shall be permitted to support luminaires (lighting fixtures) weighing ___ kg or less. A luminaire (lighting fixture) that weighs more than ___ kg  shall be supported independently of the outlet box unless the outlet box is listed for the weight to be supported
    • 23
    • 23
  43. Outlet boxes or outlet box systems used as the sole
    support of a ceiling suspended (paddle) fan shall be listed, shall be marked by
    their manufacturer as suitable for this purpose, and shall not support
    ceiling-suspended (paddle) fans that weigh more than ___ kg For outlet boxes or
    outlet box systems designed to support ceiling suspended (paddle) fans that
    weigh more than ___ kg, the required marking shall include the maximum weight to
    be supported
    • 32
    • 16
  44. For raceways containing conductors of 22 mm2 or larger, and for cables containing
    conductors of 22 mm2 or larger, the minimum dimensions of pull or junction
    boxes installed in a raceway or cable run shall comply with (a)(1) through
    (a)(3).

          (1) Straight Pulls. In
    straight pulls, the length of the box
    shall not be less than ___ times the raceway size of the largest raceway.

          (2) Angle or U Pulls. Where
    splices or where angle or U pulls are made, the distance between each raceway
    entry    inside the box and the opposite wall of the box shall not be less than ___ times the raceway size of the largest raceway in a row. This distance shall be increased for additional entries by the amount of the sum
    of the diameters of all other raceway entries in the same row on the same wall
    of the box. Each row shall be calculated
    individually, and the single row that provides the maximum distance shall be
    used. The distance between raceway entries enclosing the same conductor shall not be less than ___ times the raceway  size of
    the larger raceway
    • eight
    • six
    • six
  45. In pull boxes or junction boxes having any
    dimension over ___ mm, all conductors shall be cabled or racked up in an
    approved manner
    1 800
  46. Handhole enclosure covers shall have an identifying mark or logo that prominently identifies the function of the enclosure, such as
    “____.” Handhole enclosure covers shall require the use of tools to open,
    or they shall weigh over ___ kg
    • electric
    • 45
  47. Sheet steel boxes not over 1650 cm3  in size shall be made from steel not less than ___ mm thick. The wall of a malleable iron box or conduit body and a
    die-cast or permanent-mold cast aluminum, brass, bronze, or zinc box or conduit body shall not be less than ___ mm thick. Other cast metal boxes or conduit bodies shall have a wall thickness not less than
    ___ mm
    • 1.60
    • 2.40
    • 3
  48. Metal boxes over ___ cm3  in size shall be constructed so as to be of
    ample strength and rigidity. If of sheet
    steel, the metal thickness shall not be less than ___ mm uncoated
    • 1650
    • 1.35
  49. Metal covers shall be of the same material as
    the box or conduit body with which they are used, or they shall be lined with
    firmly attached insulating material that is not less than ___ mm thick, or
    they shall be listed for the purpose
    0.80
  50. (Pull and Junction Boxes for Use on Systems Over 600 Volts, Nominal)

    For Straight Pulls. The length of the box shall not be less than ___ times the outside diameter, over sheath, of the largest shielded or lead-covered conductor or cable entering the box. The length shall not be less than ___ times the outside diameter of the largest nonshielded conductor or cable
    • 48
    • 32
  51. For Angle or U Pulls.(Distance to Opposite Wall)

    The distance between
    each cable or conductor entry inside the box and the opposite wall of the box
    shall not be less than ___ times the outside diameter, over sheath, of the
    largest cable or conductor. This distance shall be increased for additional
    entries by the amount of the sum of the outside diameters, over sheath, of all
    other cables or conductor entries through the same wall of the box
    36
  52. Exception No. 2: Where cables are nonshielded and not lead covered, the
    distance of 36 times the outside diameter shall be permitted to be reduced to
    ___ times the outside diameter
    24
  53. For Angle or U Pulls.
    (Distance between Entry and Exit).

    The distance between a cable or conductor
    entry and its exit from the box shall not be less than ___ times the outside
    diameter, over sheath, of that cable or conductor
    36
  54. Boxes shall be closed by suitable covers securely fastened in place. Underground box covers that weigh over ___ kg shall be
    considered meeting this requirement. Covers for boxes shall be permanently
    marked “DANGER — HIGH VOLTAGE — KEEP OUT.” The marking shall be on the outside
    of the box cover and shall be readily visible. Letters shall be block type and
    at least ___ mm in height
    • 45
    • 13

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