DCI Cable Installation Techniques 5

Question 1

What is the correct procedure when a cable tray changes direction horizontally by 90 degrees in a ceiling installation?

Accepted Answer

Use a manufacturer-supplied horizontal elbow fitting

Answer

Manufacturer-supplied horizontal elbow fittings are designed to make direction changes while maintaining cable tray continuity, structural integrity, and proper bend radius.

Question 2

What type of cable labeling is required by TIA-606 at each end of every installed cable?

Accepted Answer

A machine-printed, permanent label identifying the cable's unique identifier

Answer

TIA-606 requires machine-printed, durable labels with a unique identifier at both ends of every cable to ensure accurate documentation and traceability.

Question 3

Which grounding practice must be followed when installing shielded twisted pair (STP) cable to prevent ground loops?

Accepted Answer

Ground the shield at one end only (typically the telecommunications room)

Answer

Shielded cable should typically be grounded at one end (the telecommunications room/equipment room) to prevent ground loops that can introduce noise onto the shield.

Question 4

What is the minimum clearance that must be maintained between low-voltage data cables and fluorescent lighting fixtures per TIA-569?

Accepted Answer

125 mm (5 in)

Answer

TIA-569 requires a minimum 125 mm (5 inch) separation between unshielded data cables and fluorescent lighting fixtures to reduce electromagnetic interference.

Question 5

When installing outlet boxes for data cabling in a commercial environment, what is the standard mounting height from the finished floor?

Accepted Answer

450 mm (18 in)

Answer

TIA-569 recommends outlet boxes for horizontal cabling be mounted at 450 mm (18 inches) above the finished floor as the standard height for work area outlets.

(DCI) Data Cabling Installer Practice Test

(DCI) Data Cabling Installer Practice Test

DCI Cable Installation Techniques 5