What is the maximum distance that electrical nonmetallic tubing (ENT) should be fastened apart?

The maximum distance that electrical nonmetallic tubing (ENT) should be fastened apart is 3 feet. This requirement is outlined in the National Electrical Code (NEC), which specifies that nonmetallic raceways, including ENT, should be securely supported along their entire length to ensure proper installation and to prevent sagging or damage due to environmental factors or physical impact.

Maintaining a fastening interval of 3 feet helps to ensure that the ENT is properly secured and does not move or become misaligned over time. Additionally, it aids in protecting the conduit and the wiring within it from damage, ensuring safety and functionality in electrical installations. By adhering to this standard, professionals can effectively manage the integrity and performance of the electrical systems they work with.