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UL 1277 Document Information:
Title
UL Standard for Safety Electrical Power and Control Tray Cables with Optional Optical-Fiber Members
Underwriters Laboratories Inc.
Publication Date:
Nov 14, 2001
Scope:
These requirements cover electrical power and control cables
consisting of either two or more
current-carrying copper, aluminum, or copper-clad aluminum circuit
conductors, or one or more pairs
of thermocouple-extension wires. Thermocouple-extension wires and
circuit conductors shall not be
mixed in the same cable. These cables are constructed with or without
either or both:
a) One bare or one or more insulated grounding conductor(s), and
b) One or more individually jacketed optical-fiber members, all under
an overall jacket.
These electrical and composite electrical/optical-fiber cables are
intended for use (optical and
electrical functions associated in the case of a composite cable) in
accordance with Article 336
and other applicable parts of the National Electrical Code (NEC),
ANSI/NFPA 70-2002 in cable trays,
in raceways, and where supported in outdoor locations by a messenger
wire.
The conductors for these cables are described in Sections 8.2 (NEC
types) and 8.3 (other
conductors). Cables are surface marked with the conductor type letters
and/or with the temperature
and "wet", "dry", or "wet or dry" ratings applicable to the
insulation. Cables for direct burial
are so marked on the surface. Cables that have a sunlight-resistant
jacket are surface marked "sun
res" or "sunlight resistant". Cables may include one or more
optical-fiber member(s) and are
surface marked to so indicate. Cables that are surface marked "oil
resistant II" have a jacket that
is for exposure to mineral oil at temperatures not in excess of
75°C (167°F). Cables that
are surface marked "oil resistant I" have a jacket that is for
exposure to mineral oil at
temperatures not in excess of 60°C (140°F). Each insulated
conductor that is oil resistant
II, oil resistant I, VW-1, gasoline-resistant, or has another
individual conductor use is
individually so marked. Cables that are surface marked "-ER" are for
use as exposed runs between a
cable tray and utilization equipment where the cables are continuously
supported and protected
against physical damage using mechanical protection such as struts,
angles, or channel.
Revised 1.2 effective March 19, 2004
The overall jacket on these cables is a "gas/vapor-tight continuous
sheath" in the sense discussed
in Sections 501.5(D) and 501.5(E) of the NEC (see 11.1.1). However,
these requirements do not cover
investigation of these cables for transmission of gases or vapors
through the core so, when these
cables are used in a hazardous location, they may need to be sealed as
described in the NEC.
These cables may contain one or more metal shields but do not have a
metal sheath or armor.
Electrical cables with a metal sheath or armor are covered as Type MC
in the Standard for
Metal-Clad Cables (UL 1569).
Connectors and other fittings for these cables are covered in the
Standard for Fittings for Cable
and Conduit (UL 514B).
These requirements do not cover the optical or other performance of
any optical-fiber member or
group of such members.
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