What is the consequence of a luminaire exceeding 16 inches in any dimension?

When a luminaire exceeds 16 inches in any dimension, it is crucial that it should not be supported solely by the screw shell. This is because larger fixtures require more stability and secure support to prevent potential hazards such as falling or dislodgment. The screw shell is not designed to bear significant weight, and relying on it for support in large fixtures could compromise safety. Proper mounting methods are necessary to ensure that the fixture is securely installed and able to withstand environmental conditions and vibrations, ensuring the safety and integrity of the electrical installation.

Additional options related to ballast or isolation measures do not directly address the structural integrity needed for larger luminaires. While additional security measures might be prudent, the primary safety concern for larger fixtures directly relates to how they are supported. Therefore, caution must be exercised to ensure that the fixture’s weight is adequately managed through proper installation practices.