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Plenum cables

Some computer room installations require plenum rated cables per the National Electric Code requirements. I have not had any problems finding plenum rated optical cables but can't seem to find a source for plenum rated copper cables. Any suggestions?
Copper fibre is an older (and original) fibre technology that I have limited experience with, especially on a data center scale. Most copper connections I have seen are from an older switch to older storage within the same rack. It may make sense to recable with optical fibre, since it offers connectivity to the newer switches, provides protection from eavesdropping, and does not have problems with interference from adjacent cabling. It's also much lighter, and these days, perhaps cheaper.

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