electrical outlets in wet locations

05/09/2018

Many farm and business enterprises utilize equipment that is served by a cord and plug type electrical connection. Examples include temporary lighting, feed augers, or water pumps for animal confinement cooling cells. The electrical outlets that serve this equipment are often in wet locations and/or subject to the elements. Installation of a standard unprotected outlet can result in corrosion of electrical components which could lead to a fire. National Electrical Code [Article 406.8 (B)] specifies that outlets installed in wet locations shall have a weatherproof enclosure. The attached photo illustrates a wet locations outlet box.  Also attached is the National Electrical Code reference.

 National Electrical Code [Article 406.8 (B)]

B) Wet Locations.

(1) 15- and 20-Ampere Receptacles in a Wet Location.

15- and 20-ampere, 125- and 250-volt receptacles installed in a wet location shall have an enclosure that is weatherproof whether or not the attachment plug cap is inserted. All 15- and 20-ampere, 125- and 250-volt nonlocking receptacles shall be listed weather-resistant type.

FPN: The types of receptacles covered by this requirement are identified as 5-15, 5-20, 6-15, and 6-20 in ANSI/NEMA WD 6-2002, National Electrical Manufacturers Association Standard for Dimensions of Attachment Plugs and Receptacles.]

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.

(2) Other Receptacles. All other receptacles installed in a wet location shall comply with (B)(2)(a) or (B)(2)(b). (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.