4 Cores Power Conductor Conductors: Stranded tinned copper wire 32/0. Overall Diameter. A fiber optic cable is a communication medium made of thin strands of glass or plastic that transmit data as pulses of light. Unlike copper cables that use electrical signals, fiber optics use light, which allows: Each fiber strand is extremely thin—almost like a human hair—but multiple fibers are. The composite fiber optic cable is a type of cable that combines both fiber optic and copper conductors within a single cable sheath. This hybrid construction allows for the simultaneous transmission of data using fiber optics and electrical power or additional data using copper conductors. 1 Plenum Applications - Applicable Flame Test: NFPA 262. Overall Diameter of Cable:. ActiFi® Composite Cable, Tight-Buffered, Indoor, Plenum Features and Benefits 2-in-1 composite cable design One cable meets power and signal needs 1, 2, 4 or 6 ClearCurve® ZBL or SMF-28® Ultra fibers Reliable performance in challenging routes 16, 18, or 20 AWG copper conductors Power transmission. Caledonian.