Electrical metallic tubing (EMT) must be securely attached to the building at intervals no greater than what distance from each junction box or conduit?

Electrical metallic tubing (EMT) must be securely attached to the building at intervals no greater than 3 feet from each junction box or conduit. This requirement is established to ensure the structural integrity and stability of the EMT installation. By securing the tubing at regular intervals, it prevents sagging or shifting, which could lead to potential hazards or electrical issues.

Maintaining this attachment distance also helps in protecting the electrical conductors within the tubing from mechanical damage and minimizes the risk of disconnections or loose connections at junction boxes. Overall, this requirement promotes safety and reliability in electrical installations, as well as compliance with the National Electrical Code (NEC) standards, which dictate these spacing guidelines to help safeguard both property and lives.