Non-locking, 15- and 20-ampere, 125- and 250-volt receptacles installed in wet locations are required to be in a weatherproof enclosure that is weatherproof whether or not the cord cap is installed. In locations other than one- and two-family dwellings, the outlet box hood must be listed, and where installed on an enclosure which is supported from grade mounted змз 406 температур 80 не мошност a post змз 406 температур 80 не мошност supported by conduit it must be identified as "extra duty."
Receptacle outlets installed outdoors on construction sites and in commercial locations are usually subject to more abuse than outdoor receptacles installed at one- and two-family dwellings. The plastic in-use covers which are commonly used on dwellings do not stand up to the constant use and rough treatment that they receive on temporary installations.
Receptacle outlets that are installed in enclosures in wet locations and are supported at grade level directly to a structure, or attached to metal or wood braces, or are supported by a raceway, are now required to have a cover which the NEC calls an outlet box-hood identified as "extra duty."