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What are Plenum cables used for?

Plenum rated cable is for use in the plenum spaces of a commercial office building. The plenum spaces are used for circulation of air in a large building. Plenum cables have specially formulated outer jackets that will not produce toxic fumes when burned. While it is okay to use a higher rated cable in lower level applications, you should not do it the other way around, also referred to as CMP cables.
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