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1-1 Rigid Steel Conduit

Rigid-steel conduit is a heavy-duty pipe that is similar in appearance to metal water pipe. It is threaded at both ends. Rigid-steel conduit provides the best protection from physical abuse because of its strength. Article 349 in the NEC covers rigid-steel conduit (Figure 1-1, page 1-2).

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Figure 1-1. Rigid-steel conduit

The size of rigid-steel conduit is the inside-diameter measurement. Rigid-steel conduit is available in sizes from 1/2 inch to 6 inches. These sizes will accommodate any job. A breakdown of the sizes of rigid-steel conduit in inches follows: 1/2, 3/4, 1, 1 1/2, 2, 2 1/2, 3, 3 1/2, 4, 5, and 6.

A full-length piece or stick of rigid-steel conduit is 10 feet long. Galvanized-steel conduit is available for application in wet areas or underground. Galvanizing prevents the rusting of conduit from moisture.


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David L. Heiserman, Editor

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Revised: June 06, 2015