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220-1201 Practice Question: A technician is installing a new network in a…
A technician is installing a new network in a school and must run cables through air handling plenums. What type of cable jacket is required for this installation?
⚠ Common exam trap
A common mix-up: candidates confuse 'plenum-rated' with 'riser-rated' or assume that shielding (e.g., STP) provides fire protection, when in fact the jacket rating is solely about fire safety and smoke emission, not signal integrity or physical protection.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Plenum-rated jacket
Plenum-rated jackets are required for cables installed in air handling plenums because they are made of low-smoke, low-flame materials (such as FEP or PFA) that do not emit toxic fumes or support combustion in the event of a fire. This complies with fire safety codes like the National Electrical Code (NEC) Article 725 and ensures that the air circulation system does not spread smoke or flames throughout the building.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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PVC jacket
Why it's wrong here
A Polyvinyl Chloride (PVC) jacket is a common and cost-effective material used for general-purpose cables in non-plenum environments. However, when exposed to fire, PVC rapidly propagates flames and releases dense, corrosive, and highly toxic smoke, including hydrogen chloride gas. This makes PVC cables extremely dangerous and strictly prohibited for installation in air-handling plenum spaces, where smoke and fumes could be rapidly distributed throughout a building.
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Plenum-rated jacket
Why this is correct
A plenum-rated (CMP) jacket is specifically engineered with special fire-retardant materials, such as fluorinated polymers (e.g., FEP or PVDF), to meet stringent fire safety codes for installation in air-handling plenum spaces. These cables exhibit low-smoke production and low flame-spread characteristics when exposed to fire, preventing the rapid distribution of toxic fumes and fire throughout a building's ventilation system. This rating is crucial for occupant safety and compliance with building codes.
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Shielded jacket
Why it's wrong here
A shielded jacket incorporates a metallic layer (foil or braid) to protect against electromagnetic interference (EMI) and radio frequency interference (RFI), ensuring data integrity in electrically noisy environments. While crucial for signal quality, this shielding offers no inherent fire resistance or low-smoke properties required for cables installed in air-handling plenum spaces. Therefore, a shielded cable without a plenum rating would violate fire safety codes in such locations.
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Riser-rated jacket
Why it's wrong here
Riser-rated (CMR) jackets are designed for vertical cable runs between floors in non-plenum areas, such as within walls or in elevator shafts. These cables are engineered to prevent the spread of fire from floor to floor, but they do not meet the stringent low-smoke and low-flame propagation requirements mandated for air-handling plenum spaces. Installing a riser-rated cable in a plenum would pose a significant fire hazard due to its potential to spread fire and produce toxic smoke.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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