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Illustrated Changes to the NEC, 2005 Edition - Part 2

Article 348

Flexible Metal Conduit: Type FMC

348.30 Secured and Supported

Part II. Installation

Revisions to Exception No. 2 relax the requirements for securing flexible metal conduit at terminations where flexibility is required, since there is little point in installing flexible metal conduit at a termination point where flexibility is required, only to have to secure it in place.

New exception permits “6 ft whips for branch circuits without support” for luminaires or other electrical equipment within an accessible ceiling.

Flexible metal conduit must be installed as a complete system [300.10, 300.12, and 300.18(A)], and it must be securely fastened in place and supported.

(A) Securely Fastened. Flexible metal conduit must be securely fastened by a means approved by the authority having jurisdiction within 1 ft of termination and at intervals not exceeding 41/2 ft. Figure 348-1

Ex 2: At terminals where flexibility is required, unsupported lengths cannot exceed: Figure 348-2
(1) 3 ft for trade sizes 1/2 through 11/4
(2) 4 ft for trade sizes 11/2 through 2
(3) 5 ft for trade size 21/2 and larger

Ex 4: Lengths not exceeding 6 ft can be unsupported from the last point where the raceway is securely fastened for connections within an accessible ceiling to luminaire(s) or other equipment. Figure 348-3


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