- A
PVC jacket
Why wrong: PVC cables are not plenum-rated and produce toxic smoke in a fire, making them unsafe for air handling spaces.
- B
Plenum-rated jacket
Plenum-rated cables are designed for use in air plenums and meet fire safety codes.
- C
Shielded jacket
Why wrong: Shielding protects against EMI, but it does not address fire safety requirements for plenum spaces.
- D
Riser-rated jacket
Why wrong: Riser-rated cables are for vertical runs between floors, not for air handling plenums.
Question 740 of 1,020
Why Plenum-Rated Cable is Required in Air Plenums
This 220-1201 practice question tests your understanding of cabling. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Quick Answer
The correct choice is a plenum-rated jacket because fire safety codes mandate that cables installed in air handling spaces must not emit toxic fumes or support flame propagation. Plenum-rated cables are constructed with materials like fluorinated ethylene propylene (FEP) or low-smoke PVC, which self-extinguish and produce minimal smoke, unlike standard PVC jackets that release hazardous hydrochloric acid gas when burned. On the CompTIA A+ Core 1 220-1201 exam, this question tests your understanding of network installation best practices and local building codes, often appearing as a scenario where you must choose between plenum, riser, or PVC cable. A common trap is selecting “riser-rated” cable, which is only approved for vertical shafts between floors, not for air plenums. Remember the memory tip: “Plenums push air, so pick the jacket that won’t push poison.”
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
PVC jacket
Why it's wrong here
PVC cables are not plenum-rated and produce toxic smoke in a fire, making them unsafe for air handling spaces.
- ✓
Plenum-rated jacket
Why this is correct
Plenum-rated cables are designed for use in air plenums and meet fire safety codes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Shielded jacket
Why it's wrong here
Shielding protects against EMI, but it does not address fire safety requirements for plenum spaces.
- ✗
Riser-rated jacket
Why it's wrong here
Riser-rated cables are for vertical runs between floors, not for air handling plenums.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often 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.
Detailed technical explanation
How to think about this question
Plenum-rated cables (CMP) are tested under UL 910 or NFPA 262, which measures flame spread and smoke production in a horizontal burn test simulating an air-handling space. The jacket material typically uses fluoropolymers like FEP, which self-extinguish and produce minimal smoke, unlike PVC which can release hydrogen chloride gas. In real-world scenarios, using non-plenum cable in a plenum can lead to building code violations, failed inspections, and increased liability in the event of a fire.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Cabling — This question tests Cabling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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