CAT 5e cable type

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 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.

Thanks.
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 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

Sincerely,
Joseph Golan, RCDD

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