What conditions must be met for a 1900 box to be supported by EMT when it does not contain devices?

For a 1900 box that does not contain devices to be supported by EMT (Electrical Metallic Tubing), all specified conditions must indeed be satisfied. The National Electrical Code (NEC) provides guidelines on how boxes can be supported, particularly in relation to flexible conduits and rigid conduits.

When a 1900 box is empty, it typically lacks the inherent weight or structure that would naturally allow for secure fittings and support. Thus, having all conditions met ensures that the box maintains structural integrity and is securely mounted, preventing issues such as movement, stress on the connections, or potential electrical hazards.

These conditions often pertain to factors such as the box size, mounting methods, and the ways EMT is connected. Compliance with all conditions enhances safety and functionality within electrical installations.

Understanding this ensures that electrical contractors adhere to proper codes and practices, ultimately leading to safer electrical systems. The emphasis on meeting all conditions also highlights the necessity of careful planning and execution in electrical work, particularly concerning support and mounting of junction boxes.