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My application is for installing a hot tub outdoors and I'm reading varying answers online, so thought I'd ask here to confirm.

2 Answers 2

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You can install Liquidtight Flexible Nonmetallic Conduit (LFNC) in lengths longer than 6' (1.8m), but only if it is securely fastened at intervals less than 3' (900 mm), and within 12" (300 mm) of boxes and fittings.


Update.

Turns out that if you're following NEC 2011, 680.42(A)(1) limits you to 6' of LFNC for hot tubs. The 2014 version of the code, seems to have removed that restriction.

National Electrical Code 2014

Chapter 3 Wiring Methods

Article 356 Liquidtight Flexible Nonmetallic Conduit: Type LFNC

356.10 Uses Permitted. LFNC shall be permitted to be used in exposed or concealed locations for the following purposes:

(5) Type LFNC-B shall be permitted to be installed in lengths longer than 1.8 m (6 ft) where secured in accordance with 356.30.

356.30 Securing and Supporting. Type LFNC-B shall be securely fastened and supported in accordance with one of the following:

(1) Where installed in lengths exceeding 1.8 m (6 ft), the conduit shall be securely fastened at intervals not exceeding 900 mm (3 ft) and within 300 mm (12 in.) on each side of every outlet box, junction box, cabinet, or fitting.

National Electrical Code 2014

Chapter 6 Special Equipment

Article 680 Swimming Pools, Fountains and Similar Installations

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.


National Electrical Code 2011

Chapter 6 Special Equipment

Article 680 Swimming Pools, Fountains and Similar Installations

680.42 Outdoor Installations.

(A) Flexible Connections.

(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) external to the spa or hot tub enclosure in addition to the length needed within the enclosure to make the electrical connection.

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  • Aside, I was curious to know your source for NEC online? Thanks!
    – Scott Lin
    Oct 4, 2015 at 19:40
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For a hot tub installed under the 2011 NEC or earlier the maximum length of sealtite (liquid-tight) conduit is 6'. For the 2014 code the 6' limitation was removed.

From the 2011 NEC:

Article 680 Swimming Pools, Fountains, and Similar Installations

IV. Spas and Hot Tubs

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) external to the spa or hot tub enclosure in addition to the length needed within the enclosure to make the electrical connection.

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  • My copy of 2014 says "680.42(A)(1) Flexible Conduit. Liquidtight flexible metal conduit or liquidtight flexible nonmetallic conduit shall be permitted."
    – Tester101
    Oct 4, 2015 at 20:38
  • Says right there, 2011 NEC. Oct 4, 2015 at 20:38

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