What is a key characteristic of drain wires in control cables?

Drain wires in control cables serve an essential purpose by providing a path to ground. This characteristic is crucial for ensuring the proper functioning of the cable in various applications, particularly in reducing electromagnetic interference and enhancing signal integrity. By connecting to the grounding system, drain wires help in dissipating any extraneous noise or interference that may be induced along the cable, thereby protecting the integrity of the signal transmitted through the other conductors.

The functionality of the drain wire is about maintaining a reference potential and ensuring safety from electrical surges, which can be especially important in environments where control systems are in close proximity to high-voltage lines or other sources of electrical noise. When connected correctly, drain wires can help prevent interference and improve the overall performance of control systems.