A luminaire weighing more than how many pounds should not be supported by the screw shell of a lampholder?

The reason why a luminaire weighing more than 6 pounds should not be supported by the screw shell of a lampholder is based on safety guidelines and electrical code requirements that address the structural integrity and safety of lighting fixtures. The screw shell, which is part of a lampholder, is primarily designed to hold the light bulb and is not intended to support significant weight.

Supporting heavier fixtures directly from the lampholder can lead to mechanical stress or failure of the lampholder, potentially resulting in the fixture falling and posing a safety risk, such as injuries or electrical hazards. Guidelines usually specify that any luminaire exceeding this weight should be independently supported by a mounting bracket or structure designed to handle the weight, ensuring the fixture is securely installed and compliant with safety standards.

By adhering to these specifications, electricians and inspectors help to maintain safe installations and reduce the risk of accidents associated with lighting fixtures.