CompTIA A+ Core 1 (220-1201)NetworkingMedium
A technician needs to run a new network cable through a drop ceiling in an office building where local fire code requires that any cable routed through air handling spaces be rated to not emit toxic fumes when burned. Which cable type should the technician select?
- APlenum-rated cable
- BCoaxial RG-6 cable
- CDirect burial cable
- DPVC-jacketed cable
Show answer & explanationAnswer & explanation
Correct answer: A. Plenum-rated cable
Plenum-rated cable is specifically designed with a jacket that produces less smoke and fewer toxic fumes when burned, making it required for installation in plenum spaces such as drop ceilings used for air circulation.
Why the other options are wrong
- B. Coaxial RG-6 is a cable type unrelated to the plenum-rating requirement described.
- C. Direct burial cable is designed for underground installation, not ceiling spaces.
- D. PVC-jacketed cable is cheaper but releases toxic fumes when burned, unsuitable for plenum spaces.
Plenum-Rated Cable
Plenum-rated cable has a special jacket (often FEP) that emits less smoke and toxic fumes when burned, required by fire code for installation in air handling spaces like drop ceilings and raised floors.
- Required in plenum spaces per fire code
- More expensive than standard PVC cable
- PVC (riser-rated) cable is used in non-plenum vertical spaces
Memory trick: Plenum = 'please, no toxic fumes' in the air ducts.