What is the main use of S-twist lay direction?

The main use of S-twist lay direction is primarily in underground applications. This type of twist is designed to optimize the flexibility and strength of the cable while minimizing the potential for damage due to environmental factors such as moisture or soil pressure. S-twist cables can handle the stresses encountered in underground installations, where they might be subjected to movements and strains that could affect their integrity if not constructed properly.

Moreover, S-twist lay direction helps in reducing the likelihood of cable tangling and allows for better handling during installation. This is particularly important for underground applications where access may be limited. While overhead applications might utilize different lay directions better suited for support and tension management, S-twist is specifically engineered for effectiveness in the underground setting, ensuring the safety and durability of the wiring below ground.