Which marking indicates suitability for plenum spaces?

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Multiple Choice

Which marking indicates suitability for plenum spaces?

Explanation:
Plenum spaces require cables that limit flame spread and smoke production because air-handling ducts can quickly spread smoke throughout a building. The marking FPLP specifically indicates a flame-propagation rating with low-smoke characteristics for plenum use, showing the cable is approved for installation in air-handling spaces. That explicit plenum designation is why it’s the best choice. The other markings correspond to different installation environments or general-use cables and do not inherently certify suitability for plenum spaces in the same explicit way.

Plenum spaces require cables that limit flame spread and smoke production because air-handling ducts can quickly spread smoke throughout a building. The marking FPLP specifically indicates a flame-propagation rating with low-smoke characteristics for plenum use, showing the cable is approved for installation in air-handling spaces. That explicit plenum designation is why it’s the best choice. The other markings correspond to different installation environments or general-use cables and do not inherently certify suitability for plenum spaces in the same explicit way.

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