Article 360 Flexible Metallic Tubing Type FMT

I. General

360.1	Scope
360.2	Definition

It is flexible, metallic, circular in cross section, and liquidtight without a nonmetallic jacket.

360.6

Listing Requirements

 

II. Installation

360.10

Uses Permitted

This type of tubing can be used for branch circuits in dry locations, in accessible locations, concealed, and not more than nominal 1000-V systems.

360.12

Uses Not Permitted

It cannot be used where subject to physical damage, in hoist-ways, storage battery rooms, hazardous locations, embedded in concrete, or directly buried in the earth. Lengths larger than 1.8 m (6 ft.) are not permitted.

360.20

Size

The minimum size permitted is metric designator 16 (trade size ½) except that metric designator 12 (trade size 3/8) can be used in accordance with Section 300.22(B) and (C) or part of an approved lighting fixture assembly in accordance with Section 410.67(C) and not more than 1.8 m (6 ft.) in length. The maximum size permitted is metric designator 21 (trade size ¾).

360.22

Number of Conductors

Refer to Chapter 9, Table 1, for the number of conductors permitted in metric designator 16 (trade size ½) and metric designator 21 (trade size ¾) tubing. Cables are permitted if not prohibited by cable articles. The number of cables cannot exceed what is allowed in Chapter 9, Table 1. Refer to Table 348.22 for the number of conductors permitted in metric designator 12 (trade size 3/8) tubing.

360.24

Bends

If the tubing is bent infrequently after installation, refer to Table 360.24(A) in the NEC®. If the tubing is bent for installation, use Table 360.24(B) in the NEC®.

360.40	Boxes and Fittings
360.56	Splices and Taps
360.60	Grounding

It is permitted as an equipment grounding conductor only in accordance with 250.118(B)

III. Construction Specifications

360.120

Marking

Mark in accordance with 110.21.