How often must you securely fasten electrical nonmetallic tubing (ENT) to avoid damaging cable jackets?

Securing electrical nonmetallic tubing (ENT) is crucial for protecting the cable jackets within the tubing from damage. The requirement to fasten ENT every 3 feet ensures that the tubing remains stable and does not sag or get displaced, which could potentially lead to excessive bending or pressure on the cables inside. This regular fastening helps maintain the integrity of the installation and complies with safety standards and best practices.

When ENT is secured at this interval, it minimizes movement and provides proper support, which is vital for the longevity and functionality of the cables it houses. Furthermore, maintaining the correct spacing helps to withstand various environmental factors, such as vibrations or movements from nearby equipment, ensuring reliable performance of the electrical system.