What does the term "lamp holder" imply in Article 410?

The term "lamp holder" in Article 410 refers specifically to a device that connects a lamp to the electrical supply. This definition aligns with the NEC's focus on electrical safety and the functionality of fixtures. A lamp holder serves as the mechanical and electrical connection point for a light bulb, ensuring that it receives power necessary for operation.

This device not only provides the physical structure needed to secure the lamp but also incorporates features to safely connect and disconnect the electrical current when the lamp is installed or replaced. Understanding this definition is crucial for anyone working with lighting fixtures, as it highlights the importance of proper installation and safety compliance in electrical systems.

The other options do not accurately represent the technical function of a lamp holder as described in Article 410. While a fixture that uses multiple lamps or a protective cover for lamps might relate to lighting systems, they do not encompass the primary role of a lamp holder. Similarly, a stand for displaying lamps, although relevant to lighting design, does not connect the lamp to the electrical supply, which is the essence of what defines a lamp holder.