A longitudinal shield is a metallic tape, flat or corrugated, applied lengthwise along the axis of the cable core to provide continuous shielding without spiral winding.
A longitudinal shield wraps a metallic tape along the length of the cable core rather than spiraling it around the core. The tape, which may be flat or corrugated for added flexibility, forms a continuous conductive barrier that protects the conductors from electromagnetic and electrostatic interference. Applying the shield longitudinally provides uniform coverage along the entire run.
In commercial and industrial cable, longitudinal shielding offers consistent coverage and can simplify high speed cable constructions where uniform protection is important to signal integrity. A corrugated form adds flexibility so the cable can bend while the shield maintains its protective continuity. This combination of continuous coverage and flexibility makes longitudinal shields well suited to demanding data and signal applications.
An overlapping seam or an accompanying drain wire is often used with a longitudinal shield to ensure electrical continuity and provide a convenient point for grounding, completing the path that carries interference away from the conductors.
Properly grounding the shield completes its protective function, giving interference a clear path away from the signal conductors, and an overlapping or folded seam helps maintain that coverage consistently along the entire length of the cable.
At Windy City Wire, the focus on shielded low-voltage cable connects directly to constructions that use longitudinal shields to reject interference. Supplying cable with effective, continuous shielding helps preserve signal integrity in commercial data, AV, and communication systems where interference would otherwise degrade performance.