Article 356 Liquidtight Flexible Nonmetallic Conduit Type LFNC

356.1

Scope

356.2

Definition

This conduit has a circular cross section. It comes in various types. It can have a smooth inner surface with integral reinforcement; smooth seamless inner core and cover bonded together with the reinforcement between the core and cover; or corrugated surfaces without reinforcement within the walls (Type LFNC-C). This type of conduit is flame-resistant and is approved for electrical conductors, with fittings.

356.6

Listing Requirements

 

II. Installation

356.10

Uses Permitted

This conduit can be installed exposed or concealed if protection from vapors, liquids, or solids is necessary, if flexibility is desired, or for outdoors if listed and marked for this purpose. It can also be used outdoors when listed and suitable and for direct burial use when listed and marked, as well as in lengths longer than 1.8 m (6 ft.), where additional length is essential. It can be used as a prewired assembly under certain conditions.

356.12

Uses Not Permitted

It can not be installed if subject to damage, when temperatures will exceed those for which the conduit is approved, in lengths in excess of 1.8 m (6 ft.) except under certain conditions, where voltages are higher than 600 V. except as per 600.32(A), and in a hazardous location except as per 501.10(B), 502.10(A) & (B), 503.10(A), and 504.20.

356.20

Size

Metric designator 16 (trade size ½) to metric designator 103 (trade size 4). For leads of motors metric designator 12 (3/8) can be used in accordance with 430.145(B). There are two other exceptions.

356.22

Number of Conductors

Cannot exceed the percentage of fill of Table 1, Chapter 9. Cables can be used if not prohibited by cable articles. Cable cannot exceed the fill requirements of Table 1, Chapter 9.

356.24

BendsHow Made

They must be made so that the conduit is not damaged and the internal diameter must not be reduced. Refer to Table 2, Chapter 9, for the radius of curve to the center line.

356.26

BendsNumber in One Run

The maximum that is permitted is not more than 360.

356.28

Trimming

356.30

Securing and Supporting

356.42

Couplings and Connectors

356.56

Splices and Taps

Can only be made in accordance with 300.15.

356.60

Grounding and Bonding

An equipment grounding conductor must be installed.

III. Construction Specifications

356.100

Construction

356.120

Marking






Pocket Guide to the National Electrical Code 2005
Pocket Guide to the National Electrical Code(R), 2005 Edition (8th Edition)
ISBN: 0131480014
EAN: 2147483647
Year: 2004
Pages: 120
Flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net