Transcript PowerPoint® Presentation Chapter 8 Wiring Materials — Raceways and Boxes Raceway Systems • Cable Assemblies • Other Wiring Systems • Boxes, Conduit Bodies and Fittings – Article.

PowerPoint® Presentation
Chapter 8
Wiring Materials — Raceways and
Boxes
Raceway Systems • Cable
Assemblies • Other Wiring Systems •
Boxes, Conduit Bodies and Fittings –
Article 314
Chapter 8 — Wiring Materials —
Raceways and Boxes
Rigid metal conduit
(RMC) is a conduit made
of metal.
Chapter 8 — Wiring Materials —
Raceways and Boxes
A nipple is a short piece of conduit or tubing that does
not exceed 24 in length.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Rigid polyvinyl chloride
(PVC) conduit is a conduit
made of materials other
than metal.
Chapter 8 — Wiring Materials —
Raceways and Boxes
A total run of PVC shall not
exceed 360° of bends.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Electrical metallic
tubing (EMT) is a
lightweight tubular steel
raceway without
threads on the ends.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Flexible metal conduit
(FMC) is a raceway of
metal strips which are
formed into a circular
cross-sectional raceway.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Liquidtight flexible metal conduit (LFMC) and
liquidtight flexible nonmetallic conduit (LFNC) are
raceways of circular cross section.
Chapter 8 — Wiring Materials —
Raceways and Boxes
A strut-type channel raceway is a surface raceway
formed of moisture-resistant and corrosion-resistant
metal.
Chapter 8 — Wiring Materials —
Raceways and Boxes
A surface raceway is an
enclosed channel for
conductors which is
attached to a surface.
Chapter 8 — Wiring Materials —
Raceways and Boxes
A multioutlet assembly is a
metal raceway with factoryinstalled conductors and
attachment plug receptacles.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Armored cable (AC) is an
assembly that contains
the conductors within a
jacket made of a spiral
wrap of steel.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Metal-clad (MC)
cable is a factory
assembly of one or
more conductors
with or without fiber
optic members.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Nonmetallic-sheathed
(NM) cable is a factory
assembly of two or
more insulated
conductors having an
outer sheath of
moisture-resistant,
flame-retardant,
nonmetallic material.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Service-entrance (SE)
cable is a single or
multiconductor
assembly with or without
an overall covering.
Chapter 8 — Wiring Materials —
Raceways and Boxes
A cable tray system (CTS) is an assembly of sections
and associated fittings which form a rigid structural
system used to support cables and raceways.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Cable trays for multiconductor cables are sized
according to Table 392.22(A).
Chapter 8 — Wiring Materials —
Raceways and Boxes
A wireway is a metallic or nonmetallic trough with a
hinged or removable cover designed to house and
protect conductors and cables.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Wireways are sized according to Chapter 9, Table 5.
Chapter 8 — Wiring Materials —
Raceways and Boxes
A busway is a sheet-metal enclosure that contains
factory-assembled aluminum or copper busbars
which are supported on insulators.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Overcurrent protection shall be provided at the point
where busways are reduced in ampacity.
Chapter 8 — Wiring Materials —
Raceways and Boxes
An auxiliary gutter is any enclosure equipped with a
hinged or removable cover that is used to supplement
wiring space.
Chapter 8 — Wiring Materials —
Raceways and Boxes
A box is a metallic or
nonmetallic electrical
enclosure used for
equipment, devices, and
pulling or termination
conductors.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Pull boxes and junction
boxes are points in the
electrical system which
provide access to the
raceways entering and
leaving the boxes.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Pull and junction boxes are
sized for straight or angle pulls.
Chapter 8 — Wiring Materials —
Raceways and Boxes
A conduit body is a conduit fitting that provides
access to the raceway system through a removable
cover at a junction or termination point.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Box size is calculated by the number and size of
conductors contained within the box.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Framing members of
suspended ceiling
systems are permitted as
support for boxes if the
framing member is
adequately supported
and securely fastened to
the building structure.
Chapter 8 — Wiring Materials —
Raceways and Boxes
Conduits for boxes not over 100 cu in. with threaded
hubs shall be supported within 3 where two or more
conduits are threaded wrench tight into the box.