DCI Cable Installation Techniques 2 — Questions and Answers
Question 1: What is the maximum pulling tension allowed for a 4-pair UTP Category 6 cable during installation?
- 25 lbf (110 N) (Correct answer)
- 40 lbf (178 N)
- 50 lbf (222 N)
- 110 lbf (490 N)
Correct answer: 25 lbf (110 N)
TIA-568 limits pulling tension for 4-pair UTP cable to 25 lbf (110 N) to prevent damage to cable geometry and electrical performance.
Question 2: When installing cable through a fire-rated wall penetration, which material must be used to restore the fire rating?
- Electrical tape
- Firestop sealant or putty pad (Correct answer)
- Foam spray insulation
- Drywall compound
Correct answer: Firestop sealant or putty pad
Approved firestop sealant or putty pad must be used to restore the fire-resistance rating of any wall or floor penetration per NEC and building codes.
Question 3: What is the minimum bend radius for a Category 6A UTP cable during and after installation?
- 4 times the cable diameter
- 8 times the cable diameter (Correct answer)
- 10 times the cable diameter
- 15 times the cable diameter
Correct answer: 8 times the cable diameter
TIA-568 requires a minimum bend radius of 8 times the cable outer diameter for Cat 6A UTP to maintain signal integrity.
Question 4: Which tool is used to dress down and secure cable pairs into a 110-style punch-down block?
- Crimping tool
- 110 punch-down tool (Correct answer)
- Cable stripper
- Krone tool
Correct answer: 110 punch-down tool
A 110 punch-down tool (impact tool with a 110 blade) seats each conductor into the IDC contact and trims the excess wire in one motion.
Question 5: When routing cables in a cable tray, what is the maximum fill ratio recommended by ANSI/NEMA standards?
- 25%
- 40%
- 50% (Correct answer)
- 75%
Correct answer: 50%
ANSI/NEMA VE 2 recommends a maximum fill of 50% of the cable tray cross-sectional area to allow heat dissipation and future cable additions.
Question 6: Which cable installation practice helps prevent excessive attenuation caused by improper cable management?
- Bundling all cables tightly with metal clamps
- Avoiding kinks, knots, and excessive bends (Correct answer)
- Pulling cables at maximum speed
- Leaving slack coiled in tight loops
Correct answer: Avoiding kinks, knots, and excessive bends
Avoiding kinks, knots, and sharp bends preserves the cable's twist geometry and keeps signal attenuation within specification.
Question 7: What does the term 'home run' describe in structured cabling installation?
- A cable routed between two patch panels
- A direct cable run from each outlet to the telecommunications room (Correct answer)
- A looped cable path between floors
- A cable tested end-to-end with no splices
Correct answer: A direct cable run from each outlet to the telecommunications room
A home run is a dedicated, uninterrupted cable path from each individual work area outlet directly back to the telecommunications room, which is required by TIA-568.
DCI Cable Installation Techniques 2
What is the maximum pulling tension allowed for a 4-pair UTP Category 6 cable during installation?