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  CommServ > Infrastructure > Standards > History > National Electrical Code Symbols

The National Electrical Code (1988 revision) establishes multiple level definitions for performance specifications of twisted pair wire, as follows.

Voice Communications Cables

CM: Voice communications cable for telephone installations.

CMR: Voice communications cable for use in building risers.

CMP: Voice communications cable for use in air plenums.

Data Communications Cables

CL2: Data communications cable for all equipment except telephones.

CL2R: Data communications cable for use in building risers.

CL2P: Data communications cable for use in air plenums.

DCC

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