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Description / Abstract:
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, aluminum, brass, bronze, copper, and stainless
steel conduit. The conduit covered is intended for installation in
accordance with the National Electrical Code (NFPA 70) as raceway
for wires and cables.
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 24.4(g) is limited to use in
oil free environments.
Fittings for conduit are covered in the Standard for Conduit,
Tubing, and Cable Fittings, 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
Conduit, Tubing, and Cable Fittings, UL 514B.
These requirements do not cover flexible metallic tubing.
These requirements do not cover electrical nonmetallic tubing
(ENT).