406.9 Receptacles in Damp or Wet Locations
A receptacle shall be considered to be in a location protected from the weather where located under roofed open porches, canopies, marquees, and the like, and will not be subjected to a beating rain or water runoff. All 15- and 20-ampere, 125-and 250-volt nonlocking receptacles shall be a listed weather-resistant type.
Informational Note No. 1: Requirements for extra-duty outlet box hoods are found in ANSI/UL 514D-2016, Cover Plates for Flush-Mounted Wiring Devices. "Extra duty" identification and requirements are not applicable to listed receptacles, faceplates, outlet boxes, enclosures, or assemblies that are identified as either being suitable for wet locations or rated as one of the outdoor enclosure-type numbers of Table 110.28 that does not utilize an outlet box hood.
Exception: 15- and 20-ampere, 125-through 250-volt receptacles installed in a wet location and subject to routine high-pressure spray washing shall be permitted to have an enclosure that is weatherproof when the attachment plug is removed.
Informational Note No. 2: The configuration of weather-resistant receptacles covered by this requirement are identified as 5—15, 5—20, 6—15, and 6—20 in ANSI/NEMA WD 6—2016, Wiring Devices — Dimensional Specifications.
(a) A receptacle installed in a wet location, where the product intended to be plugged into it is not attended while in use, shall have an enclosure that is weatherproof with the attachment plug cap inserted or removed.
(b) A receptacle installed in a wet location where the product intended to be plugged into it will be attended while in use (e.g., portable tools) shall have an enclosure that is weatherproof when the attachment plug is removed.