Code Change Summary: New definition of a Weather-Resistant Receptacle added to Article 100.

SME commentary: In the 2026 National Electrical Code, a new definition has been added to Article 100 for the term Weather-Resistant Receptacle, Receptacle, Weather-Resistant (WR). A receptacle constructed to be resistant to the adverse effects of damp, wet, or outdoor locations.

The term has long been used in several locations of NEC^® Article 406, but until now, there has been no standalone definition in Article 100 to clarify exactly what constitutes a weather-resistant receptacle. This addition improves code usability and helps ensure consistency across installations.

The need for this definition was identified by the National Electrical Manufacturers Association (NEMA), which submitted a public input pointing out that the term appears in multiple locations throughout the Code without a centralized definition.

The new definition aligns with similar language used in the glossary of UL Standard 498, Attachment Plugs and Receptacles. Section 2.33 of UL 498 defines a weather-resistant receptacle as a “flush-type receptacle which by its construction is intended to provide resistance to the effects of outdoor exposure when installed in accordance with article 406 of the national electrical code”. To qualify for this classification, receptacles must pass a series of rigorous tests outlined in Supplement SD of UL 498. These include accelerated aging tests, UV exposure testing, corrosion resistance testing, cold impact resistance, water exposure simulations, and galvanic compatibility of metals used in the receptacle construction. These additional requirements ensure that weather-resistant receptacles can endure real-world outdoor conditions without degrading over time.

The marking requirements for these devices are also significant. As specified in Section SD9 of UL 498, a weather-resistant receptacle must be visibly marked with the phrase “Weather Resistant” or the abbreviation “WR.” This marking must remain visible after the device is installed with the cover plate secured and must use letters no smaller than 3/16 inch (4.8 mm) in height.

With this definition now included in Article 100, the NEC^® reinforces its alignment with product standards and ensures that inspectors, installers, and designers are all referring to the same criteria when selecting or verifying weather-resistant receptacles. This clarification also reduces ambiguity in enforcement and promotes uniform installation practices, especially in areas exposed to weather conditions where degradation of standard receptacles could present a fire or shock hazard.

This change brings clarity and consistency and aligns the NEC^® more closely with nationally recognized product evaluation and testing standards.

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:

Article 100 Definitions.

The definition did not exist.

2026 Code Language:

Article 100 Definitions.

N Receptacle, Weather-Resistant (WR). (Weather-Resistant Receptacle). A receptacle constructed to be resistant to the adverse effects of damp, wet, or outdoor locations.