220-801 · Question #1016
Which of the following ratings describes a cable that is safe to run above a drop ceiling with open HVAC?
The correct answer is A. Plenum rated. Plenum-rated cables are specifically designed for use in plenum spaces - areas above drop ceilings or below raised floors that are used as part of the HVAC air-return system. These cables use a special fire-retardant jacket that, if it burns, produces less toxic smoke than…
Question
Options
- APlenum rated
- BCAT6 rated
- CSTP rated
- DCAT5 rated
How the community answered
(35 responses)- A91% (32)
- C6% (2)
- D3% (1)
Explanation
Plenum-rated cables are specifically designed for use in plenum spaces - areas above drop ceilings or below raised floors that are used as part of the HVAC air-return system. These cables use a special fire-retardant jacket that, if it burns, produces less toxic smoke than standard PVC cables. Building and fire codes typically require plenum-rated cable in these spaces to prevent toxic gases from circulating through ventilation systems. CAT5, CAT6, and STP are cable performance/shielding specifications, not fire/safety ratings.
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