In the prelude to the questions, we gave away the fact this is a nonmetallic
conduit. We also gave away "it's a conduit" in this question. What we didn't give away is the particular type. This is
Liquidtight Flexible Nonmetallic Conduit (Type LFNC) [356.1, 356.2].
LFNC is a
flexible
nonmetallic conduit of circular cross section. It can be one of the three types
enumerated in 356.2.
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Article
356 lists seven permitted uses [356.10]. Basically, you're going to use it where
you would otherwise use a flexible metallic raceway but corrosion is a limiting factor.
That's why, for example, you might use it for a motor that's sitting under a
paper machine or in a pulping operation. It is suitable for
direct burial, if it's listed and marked for that purpose.
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Article
356 lists four prohibited uses [356.12].
One of those is in hazardous locations;
that's because plastic and static electricity tend to be ready playmates.
A second is for the protection of the conduit itself (where exposed).
A third is in lengths greater than 6 ft. But you can exceed this if you can
show the AHJ the greater length is necessary or if it's secured at intervals of
3 ft within 12 inches of every box, cabinet, and fitting.
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You must
install Type LFNC using approved methods. Article 356 gives explicit commentary regarding
bending, bend radii, number of
bends, trimming, supporting, securing, and other facets of installation [356.24 - 356.42].
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You can use
only fittings that are listed for use with LFNC [356.42]. And you can't use
angled connectors for concealed raceway installations. |
