III. Construction Specifications
342.120 Marking. Each length shall be clearly and dura- bly marked at least every 1.5 m (5 ft) with the letters IMC. Each length shall be marked as required in 110.21.
342.130 Standard Lengths. The standard length of IMC shall be 3.05 m (10 ft), including an attached coupling, and each end shall be threaded. Longer or shorter lengths with or without coupling and threaded or unthreaded shall be permitted.
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