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electrical metallic conduit (EMC)
Conduit, usually fabricated of steel, which encloses electrical wiring, thereby protecting the wiring from outside damage. The difference between electrical metallic conduit and electrical metallic tubing (EMT) is that conduit is heavy-walled and usually has threaded ends; in contrast, tubing is thinner and is not threaded. Between these two is an intermediate metallic conduit (IMC), which is 25 percent lighter and less costly than EMT; it may be threaded or threadless.
EMC(1) (ElectroMagnetic Compatibility) The use of components in electronic systems that do not electrically interfere with each other. See EMI, EMSEC and TEMPEST.
(2) (EMC Corporation, Hopkinton, MA, www.emc.com) The leading supplier of storage products for midrange computers and mainframes. Founded in 1979 by Richard J. Egan and Roger Marino, EMC has developed advanced storage and retrieval technologies for the world's largest companies. It provides a full range of RAID-based file servers and storage networks (SANs) as well as the software and services necessary to implement and manage them. In 1999, EMC acquired Data General Corporation, one of the pioneers in minicomputers in the 1970s. EMC made Data General's CLARiiON line of RAID storage systems a significant part of its product family.
In 2004, EMC acquired VMware, Inc., makers of the popular server virtualization software. Two years later, EMC expanded once again beyond storage and information management by purchasing RSA Security, Inc. The RSA acquisition provided EMC with identity protection technologies for all the data it traditionally stored and organized. See Dell, SAN, RSA and Data General.