NEC Article 410 provides comprehensive requirements for the installation, construction, and use of luminaires (lighting fixtures), lampholders, and lamps. These provisions ensure safety and reliability in lighting installations. Here is a detailed overview of NEC Article 410:

410.1 Scope

This section covers the general requirements for luminaires, lampholders, and lamps, ensuring they are installed and used safely in various settings.

410.2 Definitions

Defines key terms such as “luminaire,” “lampholder,” and “lamp” to ensure clarity and consistency within the article.

410.3 General Provisions

Specifies that all luminaires, lampholders, and lamps must be listed and labeled for the intended use. This includes ensuring that all components meet the applicable safety standards.

410.4 Luminaire Types and Applications

Details the requirements for different types of luminaires and their specific applications. For example:

• 410.4(A) Luminaires in Specific Locations: Specifies the installation requirements for luminaires in damp and wet locations, including appropriate enclosures and seals.
• 410.4(D) Bathtub and Shower Areas: Luminaires installed in these areas must be suitable for damp or wet locations to prevent electrical hazards.

410.6 Construction of Luminaires

Outlines the construction requirements for luminaires, including materials and methods to ensure durability and safety. This section also covers the protection of internal wiring and components.

410.10 Wiring and Connections

Provides requirements for the wiring and connections of luminaires, including:

• 410.10(A) Conductors: Conductors used in luminaires must be suitable for the conditions of use.
• 410.10(B) Connections: All connections must be made using approved methods to ensure safety and reliability.

410.16 Clearance and Installation

Specifies the clearance requirements for recessed and surface-mounted luminaires to prevent overheating and potential fire hazards. This includes maintaining appropriate distances from combustible materials.

410.18 Space for Cove Lighting

Ensures that adequate space is provided for the installation and servicing of cove lighting, preventing difficulties in accessing and maintaining these fixtures.

410.36 Mounting and Support

Details the requirements for securely mounting and supporting luminaires, ensuring they remain safely in place during normal operation and maintenance.

410.50 Grounding

Requires all luminaires, lampholders, and associated equipment with metal parts to be properly grounded to provide a continuous path for fault currents and enhance safety.

410.56 Reconditioned Equipment

Outlines the conditions under which lighting equipment can be reconditioned and the standards that must be met to ensure safety.

410.59 Cord-Connected Showcases

Permits individual showcases to be connected using flexible cords, provided specific conditions are met, including the use of appropriate connectors and securing methods.

410.64 Luminaires as Raceways

Luminaires are not allowed to be used as raceways for circuit conductors unless they meet specific requirements to ensure safety.

410.68 Flush and Recessed Luminaires

Specifies the construction and installation requirements for flush and recessed luminaires, including the need for thermal protection devices to prevent overheating.

410.170 to 410.184: Special Provisions for Horticultural Lighting

Provides additional requirements for horticultural lighting systems, ensuring they are listed, installed, and used according to the manufacturer’s instructions. This section includes specific provisions for grounding, GFCI protection, and support in wet environments, addressing the unique risks associated with horticultural lighting.

For further details and specific requirements, consulting the NEC Handbook and additional resources provided by the NFPA is highly recommended. More insights can be found on resources like Electrical License Renewal, IAEI Magazine, and The NEC Wiki.