Ethernet: The Definitive Guide by Charles E. Spurgeon & Joann Zimmerman
Author:Charles E. Spurgeon & Joann Zimmerman
Language: eng
Format: epub, pdf
ISBN: 9781449361846
Publisher: O’Reilly Media, Inc.
Published: 2014-04-08T16:00:00+00:00
Plenum cable identifiers
The National Electric Code (NEC) provides identifiers for communications wires and cables:
CMP
Cables with a CMP identifier are plenum-rated and are suitable for installation in ducts and plenums without the use of conduit. These cables are designed for fire resistance and low smoke-producing characteristics.
CMR
Cables with a CMR identifier are not plenum-rated. However, they are engineered to prevent the spread of fire from floor to floor and are suitable for riser use and vertical shaft applications.
CM
Cables with a CM identifier are specified for general-purpose building wiring use, in areas other than plenums and risers.
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