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ống ruột gà lõi thép- cùm treo ống luồn điện ty ren- thanh ren- ty treo – ty răng
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Steel Rigid Metal Conduit (RMC) is a listed threaded metal raceway of circular cross section with a coupling which can be either a straight tapped conduit coupling or the integral type Threads are protected on the uncoupled end by color-coded thread protectors which keep them clean and sharp and aid in trade size recognition.
Steel RMC is available in trade sizes 1/2 through 6.Thread protectors for trade sizes 1, 2, 3, 4, 5, and 6 are color-coded blue; trade sizes 1/2, 1-1/2, 2-1/2, 3-1/2 are black, and trade sizes 3/4 and 1-1/4 are red. The nominal finished length of RMC with coupling is 10 feet (3.05m). Longer or shorter lengths with or without coupling and threaded or unthreaded are permitted. Steel RMC can have a primary coating of zinc, a combination of zinc and organic coatings, or a nonmetallic coating with or without zinc (such as PVC). Other supplementary coatings can be applied to all three where additional corrosion protection is needed.
Special installation practices and tools are generally required for working with PVC-coated products. These practices are covered in Section 6. Steel RMC is the heaviest-weight and thickest-wall steel conduit. Where galvanized by the hot-dip process, it has a coating of zinc on both the inside and outside. Electro-galvanized rigid has a coating
of zinc on the exterior only, with corrosion-resistant organic coatings on the interior. Steel RMC with alternate corrosion protection generally has organic coatings on both the exterior and the interior surfaces. Galvanized RMC has no temperature limitations and can be used indoors, outdoors, underground, concealed or exposed. RMC with coatings that are not zinc-based sometimes has temperature limitations or is not listed for use in
environmental air spaces; consult manufacturers’ listings and markings.