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UL 360 Document Information:
Title
UL Standard for Safety Liquid-Tight Flexible Steel Conduit
Underwriters Laboratories Inc.
Publication Date:
Jun 25, 2003
Scope:
These requirements cover the 3/8 (12), 1/2 (16), 3/4 (21), 1
(27), 1-1/4 (35), 1-1/2 (41), 2 (53), 2-1/2 (63), 3 (78), 3–1/2
(91), and 4 (103) trade sizes (metric designators) of liquid-tight
flexible steel conduit. The conduit covered is intended for
installation in accordance with the National Electrical Code (NFPA
70) as raceway for wires and cables in motor circuits operating at
potentials over 600 volts, in electric-sign circuits operating at
potentials up through 1000 volts, over 1000 volts, and in other
circuits operating at 0 – 600 V.
This conduit is for applications in which flexibility of the
conduit is necessary during installation, operation, or maintenance
and the contained conductors need protection from vapors, liquids
or solids.
This conduit is circular in cross section, having an outer
liquid-tight, nonmetallic, sunlight-resistant jacket over an inner
flexible metal core, and is for use in wet, dry, or oily locations
in which the conduit is exposed but is not subject to physical
damage. Conduit that is not marked with a temperature designation
or is marked ¨60 C¨ is for use at temperatures not in
excess of 60°C (140°F). Conduit that is for use in dry or oily
locations at a temperature higher than 60°C (140°F) is marked
¨____C dry, 60 C wet, 70 C oil res¨ or ¨____C dry, 60 C wet, 70 C
oil resistant¨ with ¨80 C¨ or ¨105 C¨ inserted as the dry-locations
temperature.
Conduit that is marked ¨80 C dry, 60 C wet, 60 C oil res¨ or ¨80
C dry, 60 C wet, 60 C oil resistant² is for use at 80°C (176°F) and
lower temperatures in air, and 60 °C (140°F) and lower temperatures
where exposed to water, oil or coolants – that is, to cutting oils
and the like in machine-tool and other industrial applications.
Conduit marked in accordance with 23.4(g) is limited to use in
oil free environments.
Fittings for liquid-tight flexible steel conduit are covered in
the Standard for Fittings for Cable and Conduit, UL 514B.
These requirements do not cover liquid-tight flexible
nonmetallic conduit. Flexible nonmetallic conduit is covered in the
Standard for Liquid-Tight Flexible Nonmetallic Conduit, UL 1660,
and the fittings for this conduit are covered in the Standard for
Fittings for Cable and Conduit, UL 514B.
These requirements do not cover flexible metallic tubing.
These requirements do not cover electrical nonmetallic tubing
(ENT).
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