What is the acceptable distance for fastening ENT near outlet boxes?

The correct choice indicates that the acceptable distance for fastening Electrical Nonmetallic Tubing (ENT) near outlet boxes is within 3 feet of each box. This requirement is in place to ensure secure and compliant installation of ENT, which helps prevent movement and potential damage over time. Fastening the tubing appropriately minimizes the risk of strain on the connections or fittings, particularly where wires transition into boxes. In electrical installations, adhering to these distances is critical for safety and maintenance, ensuring that the installation remains stable and accessible for inspections or modifications. The 3-foot guideline reflects a balance between sufficient support for the tubing while allowing flexibility for installation practices. Understanding these standards helps electricians maintain code compliance and ensures a robust and reliable electrical system.