Code Change Summary: New Section added to permit the modification of luminaires in hazardous locations using listed retrofit kits.

SME commentary: In the 2026 NEC^®, new Section 501.130(C) introduces specific language permitting the modification of luminaires in hazardous (classified) locations. The new language specifies that the “modification of luminaires, using retrofit kits listed for the location and listed for field installation with the luminaire to be retrofitted, shall be permitted”. This new provision resolves a gray area in Chapter 5 by formally recognizing retrofit practices that were previously justified only through interpretation of Article 410 requirements. Similar revisions were also made in Articles 502 and 503 to maintain consistency across hazardous (classified) location types.

Prior to this change, retrofitting a hazardous location luminaire was not explicitly addressed in Article 501, leaving installers to rely on the general requirement in 410.2, which mandates that all luminaires, lampholders, and retrofit kits be listed. Without clear direction in Article 501, some jurisdictions questioned whether luminaire modifications in hazardous locations could ever be considered code compliant, even when using properly listed kits. The addition of this language establishes a clear and enforceable path for performing such retrofits while preserving the hazardous location integrity of the installation.

Retrofit kits for hazardous locations must be specifically listed and labeled for the classified area in which they are installed. The listing process ensures that the retrofit will not alter the area classification or compromise the original explosion protection of the luminaire enclosure. The modification must maintain all required design and construction features, including gasket integrity, joint flame paths, and wiring methods suitable for the classified environment. The retrofit kit must also be evaluated with the specific luminaire model or family for which it is intended rather than as a generic replacement kit.

Installers must confirm that the retrofit does not invalidate the existing classification markings. Listed retrofit kits will comply with UL 844, the Standard for Luminaires for Use in Hazardous (Classified) Locations, ensuring that the completed luminaire assembly meets all applicable electrical and mechanical performance requirements.

By codifying these provisions directly in Article 501, the NEC^® now provides clear direction for retrofitting luminaires in hazardous locations. This improves usability for field electricians, design professionals, and inspectors by eliminating ambiguity and ensuring that retrofit work can be performed safely while maintaining compliance with listing and labeling requirements.

Below is a preview of the NEC^®. See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2026 NEC^® edition of NFPA 70.

2023 Code Language:

This code section did not exist.

2026 Code Language:

N 501.130(C) Luminaire Retrofit Kits. Modification of luminaires, using retrofit kits listed for the location and listed for field installation with the luminaire to be retrofitted, shall be permitted.