What is the maximum weight of a luminaire permitted to be supported by the screw shell of a lampholder?

The maximum weight of a luminaire that can be supported by the screw shell of a lampholder is specified by the National Electrical Code for safety and reliability. A weight limit of 6 pounds ensures that the lampholder is not subjected to excessive strain, which could lead to failure or hazardous conditions, such as a loose connection or potential electrical faults. Additionally, this weight limit takes into consideration the possible impacts on the electrical integrity and mechanical stability of the fixture.

Supporting luminaires beyond this weight could compromise the security of the lampholder and increase the risk of accidents, such as the luminaire falling, which could cause injury or damage. The 6-pound guideline aligns with safety standards that help to protect both the installation and the users.

The other weight options exceed what has been evaluated as safe for typical lampholders, thus making them unsuitable under the NEC requirements. Ensuring compliance with this specification is crucial for maintaining electrical safety within residential and commercial installations.