Liquidtight Flexible Metal Conduit

[dav5y]

Hi All,

Does anybody know the maximum allowable length for the installation of Liquidtight Flexible Metal Conduit per the NEC ??????

 

[iwire]

Hi All,

Does anybody know the maximum allowable length for the installation of Liquidtight Flexible Metal Conduit per the NEC ??????

There is none, you can run a mile of it as long as you stay under 360 degrees of bend.

Now if you plan on using the LFMC as the EGC there are limits, see 250.118.

 

[sgunsel]

See Article 350. No limit on length, although there are other limitations for its use.

 

[Sierrasparky]

So how does 680.42 work? It limits length.

680.42 Outdoor Installations. A spa or hot tub installed
outdoors shall comply with the provisions of Parts I and II
of this article, except as permitted in 680.42(A) and (B),
that would otherwise apply to pools installed outdoors.
(A) Flexible Connections. Listed packaged spa or hot tub
equipment assemblies or self-contained spas or hot tubs
utilizing a factory-installed or assembled control panel or
panelboard shall be permitted to use flexible connections as
covered in 680.42(A)(1) and (A)(2).
(1) Flexible Conduit. Liquidtight flexible metal conduit
or liquidtight flexible nonmetallic conduit shall be​

permitted in lengths of not more than 1.8 m (6 ft).

 

[iwire]

So how does 680.42 work? It limits length.

It works fine

90.3 Code Arrangement. This Code is divided into the
introduction and nine chapters, as shown in Figure 90.3.
Chapters 1, 2, 3, and 4 apply generally; Chapters 5, 6, and 7
apply to special occupancies, special equipment, or other special
conditions. These latter chapters supplement or modify the
general rules. Chapters 1 through 4 apply except as amended
by Chapters 5, 6, and 7 for the particular conditions.

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