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 |
Article 90 Introduction
General
Wiring and Protection
Wiring Methods and Materials
Equipment for General Use
Special Occupancies
Special Equipment
Special Conditions
Tables
Annex C. Conduit and Tubing Fill Tables for Conductors and Fixture Wires of the Same Size
Annex D. Examples
Annex E. Types of Construction