-
The sum of the
cross-sectional areas of all contained conductors at any cross section of a
wireway shall not exceed __ percent of the interior cross-sectional area of the
wireway
20
-
Wireways shall be
supported where run horizontally at each end and at intervals not to exceed __ mm or for individual lengths longer than __ mm at each end or joint,
unless listed for other support intervals. The distance between supports shall
not exceed __ mm
-
Vertical runs of
wireways shall be securely supported at intervals not exceeding __ mm and
shall not have more than one joint between supports. Adjoining wireway sections
shall be securely fastened together to provide a rigid joint
4 500
-
_____ are flame
retardant, nonmetallic troughs with removable covers for housing and protecting
electric wires and cables in which conductors are laid in place after the
wireway has been installed as a complete system
Nonmetallic Wireways
-
The sum of
cross-sectional areas of all contained conductors at any cross section of the
nonmetallic wireway shall not exceed __ percent of the interior
cross-sectional area of the nonmetallic wireway
20
-
Nonmetallic wireways
shall be supported where run horizontally at intervals not to exceed __ mm,
and at each end or joint, unless listed for other support intervals. In no case
shall the distance between supports exceed __ mm
-
Vertical runs of
nonmetallicwireway shall be securely supported at intervals not exceeding __
mm, unless listed for other support intervals, and shall not have more than one
joint between supports. Adjoining nonmetallicwireway sections shall be securely
fastened together to provide a rigid joint
1 200
-
_____ is a type of
surface, flush, or freestanding raceway designed to hold conductors and
receptacles, assembled in the field or at the factory
Multioutlet Assembly
-
A multioutlet
assembly shall not be installed as follows:
(1) Where concealed, except that it
shall be permissible to surround the back and sides of a metal multioutlet
assembly by the building finish or recess a nonmetallicmultioutlet assembly in
a baseboard
(2) Where subject to severe physical damage
(3) Where the voltage
is __ volts or more between conductors unless the assembly is of metal having
a thickness of not less than __ mm
(4)
Where subject to corrosive vapors
(5) In hoistways
(6) In any hazardous
(classified) locations except Class I, Division 2 locations as permitted in
5.1.2.1(b)(3)
-
_____ An assembly of
two insulated conductors within a nonmetallic jacket or an extruded
thermoplastic covering. The classification includes surface extensions intended
for mounting directly on the surface of walls or ceilings
Nonmetallic Extension
-
Nonmetallic
extensions shall be permitted only in accordance with 3.82.2.1(a), (b), and
(c).
(a)From an Existing Outlet. The extension shall be from an
existing outlet on a __- or __-ampere branch circuit.
(b) Exposed and in a Dry Location.
The extension shall be run exposed and in a dry location.
(c)Residential
or Offices. For nonmetallic surface extensions mounted directly on
the surface of walls or ceilings, the building shall be occupied for
residential or office purposes and shall not exceed three floors above grade
-
Nonmetallic
extensions shall not be where the voltage between conductors exceeds __ volts
for nonmetallic surface extension and __ volts for aerial cable
-
One or more
extensions shall be permitted to be run in any direction from an existing
outlet, but not on the floor or within __ mm from the floor
50
-
Nonmetallic surface
extensions shall be secured in place by approved means at intervals not
exceeding __ mm, with an allowance for __ mm to the first fastening where the
connection to the supplying outlet is by means of an attachment plug
-
____ is a metallic
raceway that is intended to be mounted to
the surface of or suspended from
a structure, with associated accessories for the installation of electrical
conductors and cables
Strut-Type Channel Raceway
-
The derating factors
of 3.10.1.15(b)(2)a shall not apply to conductors installed in strut-type
channel raceways where all of the following conditions are met:
(1) The
cross-sectional area of the raceway exceeds ___ mm2
(2) The current-carrying conductors do not
exceed __ in number.
(3) The sum of the cross-sectional areas of all contained
conductors does not exceed __ percent of the interior cross-sectional area of
the strut-type channel raceways, calculated in accordance with the following
formula for wire fill
-
A surface mount
strut-type channel raceway shall be secured to the mounting surface with
retention straps external to the channel at intervals not exceeding __ mm
and within __ mm of each outlet box, cabinet, junction box, or other channel
raceway termination. (same for Suspension
Mount)
-
______ is a metallic
raceway that is intended to be mounted to the surface of a structure, with
associated couplings, connectors, boxes, and fittings for the installation of
electrical conductors
Surface Metal Raceway
-
Surface metal
raceways shall not be used in the following:
(1) Where subject to severe
physical damage, unless otherwise approved
(2) Where the voltage is __ volts
or more between conductors, unless the metal has a thickness of not less than
__ mm nominal
(3) Where subject to corrosive vapors
(4) In hoistways
(5) Where concealed, except as permitted in 3.86.2.1
-
The derating factors
of 3.10.1.15(b)(2)a shall not apply to conductors installed in surface metal
raceways where all of the following conditions are met:
(1) The cross-sectional
area of the raceway exceeds __ mm2
(2)
The current-carrying conductors do not exceed __ in number
(3) The sum of the
cross-sectional areas of all contained conductors does not exceed __ percent of
the interior cross-sectional area of the surface metal raceway
-
______ is
a nonmetallic raceway that is intended to be mounted to the surface of a
structure, with associated couplings, connectors, boxes, and fittings for the
installation of electrical conductors
Surface Nonmetallic Raceway
-
(Underfloor Raceways)
Half-round and flat-top raceways not over __ mm in width shall have not less
than __ mm of concrete or wood above the raceway.
-
(Underfloor Raceways)
Flat-top raceways over __ mm but not over __ mm wide with a minimum of __ mm spacing between raceways shall be covered with concrete to a depth of not less than __ mm.
-
(Underfloor Raceways)
Raceways over 100mm wide but not over 200mm wide.
Raceways spaced less than __ mm apart shall be covered with concrete to a depth of __ mm
-
(Underfloor Raceways)
In office occupancies, approved metal flat-top raceways, if not over __ mm in
width, shall be permitted to be laid flush with the concrete floor surface,
provided they are covered with substantial linoleum that is not less than __
mm thick or with equivalent floor covering.The combined cross-sectional area of
all conductors or cables shall not exceed __ percent of the interior
cross-sectional area of the raceway
-
_____ is a unit or
assembly of units or sections and associated fittings forming a structural
system used to securely fasten or support cables and raceways
Cable Tray System
-
Single-conductor
cable shall be __ mm2 or larger and shall be of a type listed and marked on the
surface for use in cable trays.
50 mm2
-
Where __ mm2 through __ mm2 single-conductorcables are installed in ladder cable tray, the maximum allowable rung spacing for the ladder cable tray shall be __ mm. Single conductors used as equipmentgrounding conductors shall be insulated, covered, or bare, and they shall be __ mm2 or larger
-
Where cable trays
support individual conductors and where the conductors pass from one cable tray
to another, or from a cable tray to raceway(s) or from a cable tray to
equipment where the conductors are terminated, the distance between cable trays or between the cable tray and the raceway(s) or the equipment shall not exceed __ mm
1 800
-
Where any of the
single conductors installed in ladder or ventilated trough cable trays are __ mm2 through __ mm2, all single conductors shall be installed in a single layer
-
Number of multiconductor cables rated 2000v or less in cable trays
Any Mixture of Cables.(Ladder or ventilated trough cabletrays)
(1) Where all of the cables are __ mm2 or
larger, the sum of the diameters of all cables shall not exceed the cable tray
width, and the cables shall be installed in a single layer.
(2) Where all of the
cables are smaller than __ mm2, the sum of the cross-sectional areas of all
cables shall not exceed the maximum allowable cable fill area in Column 1 of
Table 3.92.1.9 for the appropriate cable tray width.
(3) Where __ mm2 or larger
cables are installed in the same cable tray with cables smaller than __ mm2,
the sum of the cross-sectional areas of all cables smaller than __ mm2 shall not
exceed the maximum allowable fill area resulting from the calculation in Column2
of Table 3.92.1.9 for the appropriate cable tray width. The __ mm2 and larger
cables shall be installed in a single layer, and no other cables shall be
placed on them.
- 100 mm2
- 100 mm2
- 100 mm2
- 100 mm2
- 100 mm2
- 100 mm2
-
Number of multiconductor cables rated 2000v or less in cable trays
Multiconductor Control and/or Signal Cables Only.
- Where a ladder or ventilated trough cable tray
having a usable inside depth of __ mm or less contains multiconductor control
and/or signal cables only, the sum of the cross-sectional areas of all cables
at any cross section shall not exceed __ percent of the interior
cross-sectional area of the cable tray.
-
Number of multiconductor cables rated 2000v or less in cable trays
Multiconductor Control and/or Signal Cables Only.
- A depth of __ mm shall be used to calculate the allowable interior cross-sectional area of any cable tray that has a usable inside depth of more than __ mm
-
Number of multiconductor cables rated 2000v or less in cable trays
Where a solid bottom cable tray having a
usable inside depth of __ mm or less contains multiconductor control and/or signal cables only, the sum of the
cross-sectional areas of all cables at any cross section shall not exceed __ percent
of the interior cross-sectional area of the cable tray. A depth of __ mm shall
be used to calculate the allowable interior cross-sectional area of any cable
tray that has a usable inside depth of more than __ mm
-
Number of Single Conductor cables, rated 2000v or less in cable trays
Where __ mm, __ mm,
__ mm, or __ mm wide ventilated channel cable trays contain single-conductor
cables, the sum of the diameters of all single conductors shall not exceed the
inside width of the channel
-
_____is a wiring
method using knobs, tubes, and flexible nonmetallic tubing for the protection
and support of single insulated conductors
Concealed-Knob-and-Tube Wiring
-
Conductors shall
comply with 3.98.2.8 where passing through holes in structural members. Where
passing through wood cross members in plastered partitions, conductors shall be
protected by noncombustible, nonabsorbent, insulating tubes extending not less
than __ mm beyond the wood member
75
-
Concealed-Knob-and-Tube Wiring
A clearance of not
less than __ mm shall be maintained between conductors and a clearance of not
less than __ mm between the conductor and the surface over which it passes
-
Concealed-Knob-and-Tube Wiring
Conductors shall be
installed along the side of or through bored holes in floor joists, studs, or
rafters. Where run through bored holes, conductors in the joists and in studs
or rafters to a height of not less than __ mm above the floor or floor
joists shall be protected by substantial running boards extending not less than
__ mm on each side of the conductors
-
Concealed-Knob-and-Tube Wiring
Exception: In buildings completed before the wiring is installed, attic
and roof spaces that are not accessible by stairway or permanent ladder and
have headroom at all points less than __ mm, the wiring shall be permitted to
be installed on the edges of rafters or joists facing the attic or roof space
900
-
Concealed-Knob-and-Tube Wiring
Conductors shall be
rigidly supported on noncombustible, nonabsorbent insulating materials and
shall not contact any other objects. Supports shall be installed as follows:
(1) Within __ mm of each side of each tap or splice, and
(2) at intervals not exceeding __ mm
-
_____ is an exposed
wiring support system using a messenger wire to support insulated conductors by
any one of the following:
(1) A messenger with rings and saddles for conductor
support
(2) A messenger with a field-installed lashing material for conductor
support
(3) Factory-assembled aerial cable
(4) Multiplex cables utilizing a
bare conductor, factory assembled and twisted with one or more insulated
conductors, such as duplex, triplex, or quadruplex type of construction
Messenger Supported Wiring
-
The messenger shall
be supported at __ and at __ locations so as to eliminate
tension on the conductors. The conductors shall not be permitted to come into
contact with the messenger supports or any structural members, walls, or pipes
-
_____ is an exposed
wiring method using cleats, knobs, tubes, and flexible tubing for the
protection and support of single insulated conductors run in or on buildings
Open Wiring on Insulators
-
Open Wiring on Insulators
In dry locations,
where not exposed to physical damage, conductors shall be permitted to be
separately enclosed in flexible nonmetallic tubing. The tubing shall be in
continuous lengths not exceeding __ mm and secured to the surface by straps
at intervals not exceeding __ mm
-
Open Wiring on Insulators
Conductors within __ mm from the floor shall be considered exposed to physical damage.
2 100
-
Open Wiring on Insulators
Open conductors shall
be separated at least __ mm from
metal raceways, piping, or other conducting material, and from any exposed
lighting, power, or signaling conductor, or shall be separated therefrom by a
continuous and firmly fixed non-conductor in addition to the insulation of the
conductor
50
-
Conductors shall be
installed along the side of or through bored holes in floor joists, studs, or
rafters. Where run through bored holes, conductors in the joists and in studs
or rafters to a height of not less than __ mm above the floor or floor joists
shall be protected by substantial running boards extending not less than __ mm
on each side of the conductors
-
Open Wiring on Insulators
Conductors smaller than __ mm2 shall
be rigidly supported on noncombustible, nonabsorbent insulating materials and
shall not contact any other objects. Supports shall be installed as follows:
(1) Within __ mm from a tap or splice
(2) Within __ mm of a dead-end
connection to a lampholder or receptacle.
(3) At intervals not exceeding __ mm and at closer intervals sufficient
to provide adequate support where likely to be disturbed
- 8.0 mm2 (3.2 mm dia.)
- 150
- 300
- 1 400
-
Supports for
conductors __ mm2 or larger installed across open spaces shall be
permitted up to __ mm apart if noncombustible, nonabsorbent insulating
spacers are used at least every __ mm to maintain at least __ mm between
conductors.
- 8.0 mm2(3.2 mm dia.)
- 4 500
- 1 400
- 65
-
Where not likely to be disturbed in buildings of mill construction, __ mm2 and larger conductors shall be permitted to be run acrossopen spaces if supported from each wood cross member on approved insulators maintaining __ mm between conductors
-
In industrial
establishments only, where conditions of maintenance and supervision ensure
that only licensed electrical practitioner or non licensed electrical
practitioner under the supervision of a licensed electrical practitioner
service the system, conductors of sizes __ mm2 and larger shall be permitted
to be run across open spaces where supported at intervals up to __ mm
-
Where nails are used
to mount knobs, they shall not be smaller than tenpenny. Where screws are used
to mount knobs, or where nails or screws are used to mount cleats, they shall
be of a length sufficient to penetrate the wood to a depth equal to at least
__ the height of the knob and the full thickness of the cleat.
one-half
-
Cushion washers shall be used with __.
nails
-
__ mm2 or larger conductors supported on solid knobs shall be securely tied thereto by
tie wires having an insulation equivalent to that of the conductor
8.0 mm2(3.2 mm dia.)
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