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electrical metallic tubing

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electrical metallic tubing

A thin-walled metal raceway having a circular cross section; used to pull in or withdraw electric cables or wires after the tubing is installed in place; uses connectors and couplings other than the threaded type.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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This rigid conduit, originally heavy, threaded, iron pipe, was superseded in the 1920s by lightweight electrical metallic tubing (EMT).
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