The allowance for unsupported raceways has been revised, finally, to recognize a commonly accepted practice. Article 348 Flexible Metal Conduit Part II. Installation 348.30 Securing and Supporting. (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 it must be secured and supported at intervals not exceeding 4½ ft. Exception 1: Flexible metal conduit isn’t ...

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