CAT 5e cable type FREE cabling and networking Helpdesk
 Question by alberto alvarez posted 17 Aug 2005
 CAT 5e cable type
I would like to know the difference between CMX, CMR and CMP cable. Also what the letters means.

 Answer by Joseph Golan posted 18 Aug 2005
Dear alberto,

CMX is not rated for riser or plenum use and has limited use. Allowed in 1 or 2 family dwelling

CMR is riser rated (passes vertical flame test) can be installed anywhere is passing through a plenum enviorment

CMP is plenum rated and allowed in all spaces

Reference NEC article 800, sections 800.50-53

Joseph Golan, RCDD

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