Telecom Room Cross-Connection Facility Practice Test

What is an advantage of all-dielectric cables over cables with steel strength members?

Lower cost Higher tensile strength Greater resistance to lightning and electrical conduction Easier installation

Correct Answer:

Greater resistance to lightning and electrical conduction

Explanation:

All-dielectric cables lack any metal strength members, so there’s no conductive path along the length of the cable. That insulation means surge currents from lightning or fault voltages can’t travel through the cable’s structure to energize equipment or create a shock hazard. In effect, the cable becomes more resistant to electrical conduction along its length, which is why this is a clear advantage in outdoor or high-voltage environments. Notes on the other options: tensile strength, cost, and installation ease depend on specific designs and conditions and aren’t universally better with all-dielectric constructions.

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