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UL 13 Document Information:
Title
UL Standard for Safety Power-Limited Circuit Cables
Underwriters Laboratories Inc.
Publication Date:
Jul 23, 2007
Scope:
These requirements cover 60 – 250°C (140 – 482°F) single- and
multiple-conductor power-limited circuit cables for use as fixed
wiring within buildings (some are also marked for direct burial)
principally for Class 3 and Class 2 circuits as described in
Article 725 and other applicable parts of the National Electrical
Code (NEC). Cables covered by these requirements are:
Types CL3P and CL2P (plenum cables),
Types CL3R and CL2R (riser cables),
Types CL3 and CL2 (commercial cables for other than plenum,
riser, or tray uses),
Types CL3X and CL2X (cables for limited use), and
Type PLTC (cable for non-plenum and non-riser Class 3 and Class
2 circuits in general and in trays).
Cables for Class 3 circuits are rated for 300 volts but are not
so marked. Cables for Class 2 circuits do not have a voltage
rating. See 46.1 (h).
A cable that contains one or more electromagnetic shields may be
surface marked or have a marker tape to indicate that it is
"shielded ". A cable that contains one or more optical-fiber
members has "-OF" supplementing the type letters and is
marked in accordance with 47.1 (d). A cable may consist of or
contain one or more coaxial members.
The overall jacket on a cable that has "sun res" or "sunlight
resistant" in a surface marking or on a marker tape complies with a
720-h sunlight-resistance test. The overall jacket on all Type PLTC
cable is required to comply with this 720-h test, so Type PLTC
cable may be marked "sun res" or "sunlight resistant" but is not
required to be so marked.
A cable that has "dir bur", "direct burial", or "for direct
burial" in a surface marking or on a marker tape complies with a
1000-lbf crushing test. Direct-burial cable with wire armor, a
metal braid, interlocked metal armor, or a smooth or corrugated
metal sheath has a jacket over the metal covering.
Smoke and fire considerations are as follows for the cables
covered in these requirements:
TYPE CL3P and CL2P CABLES – Cables that are intended for
installation in accordance with section 725.82 (A) of the National
Electrical Code, ANSI/NFPA 70, in a duct, plenum, or other space
used to transport environmental air without the cables being
enclosed in a raceway in that space are to be tested for smoke and
flame characteristics in accordance with the National Fire
Protection Association Standard Method of Test for Flame Travel and
Smoke of Wires and Cables for Use in Air-Handling Spaces, ANSI/NFPA
262. A cable that complies exhibits a maximum flame-propagation
distance that is not greater than 5 ft, 0 in or 152 cm, a peak
optical density of smoke produced of 0.50 or less (32 percent light
transmission), and an average optical density of smoke produced of
0.15 or less.
TYPE CL3R and CL2R CABLES – Cables that are intended for use in
vertical runs in a shaft, or for installations in which the cables
penetrate more than one floor, as specified in Section 725.82 (B)
of the National Electrical Code, ANSI/NFPA 70, are to be tested for
flame-propagation characteristics in accordance with the Standard
for Test for Flame-Propagation Height of Electrical and
Optical-Fiber Cables Installed Vertically in Shafts, UL 1666. A
cable that complies has a flame-propagation height less than 12 ft,
0 in or 366 cm and temperatures are 850.0°F (454.4°C) or less at a
height of 12 ft, 0 in or 366 cm.
TYPE CL3 and CL2 CABLES – Type CL3 and CL2 general-use cables
comply with a 70,000 Btu/h (20.5 kW) vertical-tray flame test. The
cable manufacturer chooses one of the following tests:
THE UL TEST REFERENCED IN 25.2.1 – This paragraph applies the
test method described as the UL Flame Exposure (smoke measurements
are not applicable) in the Standard for Vertical-Tray
Fire-Propagation and Smoke-Release Test for Electrical and
Optical-Fiber Cables, UL 1685, to cable that is surface marked or
designated by a marker tape as "CL3" or "CL2". For compliance, this
test damages less than 8 feet (244 cm) of cable.
THE FT4/IEEE 1202 TEST REFERENCED IN 25.3.1 – This paragraph
applies the test method described as the FT4/IEEE 1202 Type of
Flame Exposure (smoke measurements are not applicable) in the
Standard for Vertical-Tray Fire-Propagation and Smoke-Release Test
for Electrical and Optical-Fiber Cables, UL 1685. This test differs
from the UL test in loading (more cables are used, with small
cables bundled, and the spacing between cables is limited), burner
angle, and failure criterion. For compliance, this test damages
less than 150 cm (59 in) of cable. A cable that complies either is
not marked or it bears the designation "FT4/IEEE 1202" or "FT4"
legible on or through the outer surface or on a marker tape [see
marking in 46.1 (i)].
TYPE CL3X and CL2X CABLES – Type CL3X and CL2X cables comply
with the VW-1 vertical-specimen flame test. The cable is not marked
"VW-1".
TYPE PLTC CABLE – Type PLTC tray cable complies with a 70,000
Btu/h (20.5 kW) vertical-tray flame test. The cable manufacturer
chooses the test in (c)(1) or (c)(2). This test is applied to cable
that is surface marked or designated by a marker tape as
"PLTC".
The overall jacket on Type PLTC cable is a "gas/vapor-tight
continuous sheath" in the sense discussed in sections 501.15 (D)
and 501.15 (E) of the National Electrical Code, ANSI/NFPA 70.
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.
With certain exceptions, as noted in 1.9, Type CL3X and CL2X
cables are required by the NEC to be used with protection such as
raceway. The Type CL3 and CL2 and other cables covered in these
requirements that are not required by the NEC to be used in raceway
are capable of use without the physical protection of raceway but
may be pulled into conduit or installed in other raceway.
Type CL3X and CL2X cables are limited by the NEC to use in
unconcealed spaces in which the exposed length of cable does not
exceed 10 ft or 3.05 m, and in raceway. These NEC limitations do
not apply to Type CL3X and CL2X cables that are smaller in diameter
than 0.25 in or 6.35 mm and are used in a one-, two-, or
multi-family dwelling.
These requirements do not cover cables that contain conductors
for electric-light, power, or Class 1 circuits. These requirements
do not cover optical-fiber cables that do not contain any
electrical conductors. These requirements do not cover
communication cables (see the Standard for Communications Cables,
UL 444) or cables for power-limited fire-alarm circuits (see the
Standard for Cables for Power-Limited Fire-Alarm Circuits, UL
1424). These requirements do not cover vault-lacing cable, which is
for use in concrete as part of a theft-alarm system.
These requirements do not cover the optical or other performance
of any optical-fiber member or group of such members. See 8.3.
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