How frequently must EMT be supported in installation?

The requirement for supporting Electrical Metallic Tubing (EMT) during installation is standardized to ensure safety and structural integrity. EMT must be supported at intervals of 10 feet or less, which accommodates the material's lightweight nature while also preventing sagging or movement that could lead to damage or safety hazards. This support guideline is crucial for maintaining the integrity of the conduit system and ensuring it can withstand various environmental factors as well as stress from cable pulls and electrical loads.

Options suggesting other intervals, whether shorter or longer, do not conform to the established codes and practices, which emphasize the importance of regular support to ensure that EMT remains securely in place throughout its installation and use. By adhering to this 10-foot guideline, installers can guarantee compliance with the National Electrical Code (NEC) and maintain a safe environment for both the structure and its occupants.