DCI Standards & Codes Compliance 4 — Questions and Answers
Question 1: Per ANSI/TIA-1005-A, the standard for industrial telecommunications cabling, the harsh environment zone requires cables rated at minimum:
- Industrial Ethernet Category 5e
- Category 6 with additional shielding
- MICE 3 environmental rating (Correct answer)
- Plenum-rated CMP
Correct answer: MICE 3 environmental rating
TIA-1005-A uses the MICE (Mechanical, Ingress, Climatic/Chemical, Electromagnetic) classification; harsh industrial zones require MICE 3 rated components.
Question 2: A building permit is typically required before installing low-voltage cabling in a commercial building. Who is ultimately responsible for obtaining this permit?
- The cable manufacturer
- The installing contractor (Correct answer)
- The telecommunications outlet vendor
- The end-user IT department
Correct answer: The installing contractor
The installing contractor is legally responsible for obtaining required building permits before commencing low-voltage cabling work.
Question 3: According to TIA-568, which cable category is the MINIMUM required for new horizontal cabling installations as of the current standard?
- Category 5
- Category 5e
- Category 6 (Correct answer)
- Category 6A
Correct answer: Category 6
Current TIA-568 revisions require a minimum of Category 6 for new horizontal cabling installations to support modern applications.
Question 4: NEC Article 770 covers which type of cabling system?
- Coaxial CATV cables
- Optical fiber cables (Correct answer)
- Twisted-pair network cables
- Power-limited fire alarm cables
Correct answer: Optical fiber cables
NEC Article 770 specifically governs optical fiber cables and their installation requirements.
Question 5: When testing a completed structured cabling installation for TIA-568 compliance, which test result is used to verify channel performance?
- Wire map only
- Length measurement only
- A full suite including NEXT, return loss, insertion loss, and propagation delay (Correct answer)
- Visual inspection report
Correct answer: A full suite including NEXT, return loss, insertion loss, and propagation delay
TIA-568 channel qualification requires a comprehensive test suite including NEXT, return loss, insertion loss, delay skew, and propagation delay.
Question 6: The NEC defines 'plenum' as a space used for environmental air. Which of the following is NOT typically classified as a plenum space?
- Raised floor used as an air supply
- Suspended ceiling used as return air
- A dedicated cable tray in a conduit (Correct answer)
- Above-ceiling air return space
Correct answer: A dedicated cable tray in a conduit
A cable tray inside a conduit is not a plenum; plenum refers to environmental air-handling spaces, not enclosed metallic raceways.
Question 7: Which authority having jurisdiction (AHJ) typically enforces NEC requirements for low-voltage cabling in commercial buildings?
- The telecommunications carrier
- The local fire marshal or building department (Correct answer)
- BICSI certification board
- The cable manufacturer's representative
Correct answer: The local fire marshal or building department
Local fire marshals or building departments act as the AHJ and are responsible for inspecting and enforcing NEC compliance.
DCI Standards & Codes Compliance 4
Per ANSI/TIA-1005-A, the standard for industrial telecommunications cabling, the harsh environment zone requires cables rated at minimum: