Cables that are not plenum rated can be used in a plenum when they are installed in what?

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Multiple Choice

Cables that are not plenum rated can be used in a plenum when they are installed in what?

Explanation:
Cables in air-handling spaces must limit smoke and flames. If a non-plenum-rated cable is used in a plenum, the protection comes from placing it inside a raceway that is rated for plenum use. The plenum-rated raceway contains any combustion products and keeps them from spreading through the air distribution area, satisfying the code requirements. Shielding or cable gauge aren’t the deciding factors here—the essential point is that the cable runs inside a plenum-rated raceway.

Cables in air-handling spaces must limit smoke and flames. If a non-plenum-rated cable is used in a plenum, the protection comes from placing it inside a raceway that is rated for plenum use. The plenum-rated raceway contains any combustion products and keeps them from spreading through the air distribution area, satisfying the code requirements. Shielding or cable gauge aren’t the deciding factors here—the essential point is that the cable runs inside a plenum-rated raceway.

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