This article was posted 04/06/2007 and is most likely outdated.

Article 348 Flexible Metal Conduit: Type FMC - 348.30
 

 
Subject - Article 348 Flexible Metal Conduit: Type FMC - 348.30

April 13, 2007  

Ask a Question |  Weekly Code GraphicQuizzes |  Free Stuff InstructorsOnline Training Products | Seminars | SubscribeUnsubscribe
[ image1 Post Comments | View Comments | Notify Me When Comments Are Added ] Web Page Version [Printer-Friendly]    

Article 348   Hi Res - Cable/DSL [9962Kb]
VIEWING Video FILE requires
Real Media Player [ FREE ]
    
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


Figure 348-1
(Click on image to enlarge)


Figure 348-2
(Click on image to enlarge)


Figure 348-3
(Click on image to enlarge)

   
 

Click here to post a comment
[ View More Newsletters ] [ Send to a Friend ] [ Post Comments | View Comments | Notify Me When Comments Are Added ]

Copyright © Mike Holt Enterprises, Inc. All rights reserved.
This article is protected by United States copyright and other intellectual property laws and may not be
displayed or published on the internet without the prior written permission of Mike Holt Enterprises, Inc.

http://www.MikeHolt.com     1-888-NEC-CODE (1-888-632-2633)

Experiencing a Problem? Click Here

Comments
  • I wanted to point out a concern. In your figures, you do not show supports for the luminaires in accordance with 410.15(A) and 410.16(C). In my opinion, the end of the FMC is not secure and supported if the equipment it is attached to is not secure and supported.

    Ideally, the luminaires should be supported independent of the ceiling system so that the FMC would not be the sole means of support keeping the luminaires from falling. This is required in some jurisdictions, including all federal buildings. However, unless otherwise required by the AHJ, 410.15(C) does allow the ceiling system to support the luminaires provided that the framing members are securely attached to the building structure at "appropriate intervals" (whatever that means) and the luminaires are securely fastened to the framing members.

    Paul A. Harouff, P.E.
    Reply to this comment

  • Hi Mike - Really enjoy your site. Just for clarification shouldn't figure 348-3 be labeled "FMC" instead of "MC Cable" ?

    DAVE EATON
    Reply to this comment

  • WHY IS IT WRONG TO HAVE PANEL IN CLOSET ?

    CHARLES WINCHELL
    Reply to this comment


Get notified when new comments are posted here
* Your Email:
 
        
 
Add Your Comments to this Newsletter
* Your Name:
   Your name will appear under your comments.

* Your Email:
   Your email address is not displayed.
* Comments:

Email Notification Options:
Notify me when a reply is posted to this comment
Notify me whenever a comment is posted to this newsletter