(PEC-Chapter3) Sheet1-Part2

Under engineering
supervision, conductor ampacities shall be permitted to be calculated by means
of the following general formula:

Ampacities at ambient temperatures other than those shown in the tables shall be
determined by means of the following formula:

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

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

Exception: ___ enclosures shall be permitted to be installed
without the airspace on a concrete, masonry, tile, or similar surface

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

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

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.

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

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

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)

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.

(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

(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.

There shall be
airspace of at least ___ mm between any live metal part, including live metal
parts of enclosed fuses, and the door

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

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

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

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

___ 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

___ 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

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

(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

(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

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

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

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

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 ?

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

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

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

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

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

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

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

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)

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

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

(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

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

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

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

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

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

In pull boxes or junction boxes having any
dimension over ___ mm, all conductors shall be cabled or racked up in an
approved manner

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

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

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

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

(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

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

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

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

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