Cabling Infrastructure and Pathways Flashcards

What is the recommended separation distance between telecommunications cables and fluorescent lighting fixtures to minimize EMI?

Answer: 130 mm (5 in)

ANSI/TIA-569 recommends a minimum separation of 130 mm (5 inches) between unshielded telecommunications cables and fluorescent lighting to reduce electromagnetic interference.

In an underfloor duct system, what is the required minimum depth for a flush-mount service fitting?

Answer: Flush with finished floor surface

Flush-mount service fittings for underfloor duct systems are designed to sit flush with the finished floor surface to prevent tripping hazards while allowing access.

Which cable type is required for plenum (air-handling) spaces in the US per NEC Article 800?

Answer: CMP (Communications Plenum)

NEC Article 800 requires CMP-rated (Communications Plenum) cable in plenum air-handling spaces because it has low smoke and flame-spread characteristics.

What is the maximum weight load typically supported by a cable tray rated for medium-duty service?

Answer: 50 lbs per linear foot

Medium-duty cable trays are typically rated for 50 lbs per linear foot, which must be verified against actual cable fill weights during design.

When routing cables through a fire-rated wall, what is required at the penetration?

Answer: A UL-listed firestop system rated equal to or greater than the wall's fire rating

All penetrations through fire-rated assemblies must be sealed with UL-listed firestop systems rated to match or exceed the assembly's fire rating to maintain compartmentalization.

What is the purpose of a pull box in a long conduit run?

Answer: To provide an intermediate access point to reduce cable tension during pulls

Pull boxes are installed at intervals or bends in conduit runs to provide access points that reduce pulling tension and prevent cable jacket damage during installation.