CompTIA
N10-005 · Question #364
N10-005 Question #364: Real Exam Question with Answer & Explanation
The correct answer is B: Plenum. Plenum-rated cable uses a special low-smoke, flame-retardant jacket material that does not release toxic gases when burned, making it required in plenum spaces and air-handling areas.
Question
In the event of a fire in an office building, which of the following cable types should be installed to prevent toxic gas from burning PVC cable coatings?
Options
- ACAT6a
- BPlenum
- CCrossover
- DSTP
Explanation
Plenum-rated cable uses a special low-smoke, flame-retardant jacket material that does not release toxic gases when burned, making it required in plenum spaces and air-handling areas.
Common mistakes.
- A. CAT6a is a performance specification describing bandwidth and crosstalk characteristics; CAT6a cable is available in both standard PVC and plenum-rated jacket versions, so the category alone does not ensure fire safety.
- C. A crossover cable is a twisted-pair cable with a specific pin-out wiring pattern used to connect similar devices directly; it is not a cable type defined by its jacket fire-resistance properties.
- D. STP (Shielded Twisted Pair) refers to the addition of metallic shielding around cable pairs to reduce EMI, and is unrelated to the fire-resistance or toxicity of the cable's jacket material.
Concept tested. Plenum-rated cable for fire safety in air-handling spaces
Reference. https://www.nfpa.org/codes-and-standards/nfpa-70-standard-for-electrical-installations/70
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