Weather-resistant receptacle. provides compliance with 2011 NEC® Article 406.9 that states that all receptacles installed in wet and damp locations must be weather-resistant. WR designations provide visual identification. weather-resistant receptacles offer protection from rain, snow, ice, moisture and humidity when properly installed in an approved weather protective or while in use cover. weather-resistant receptacles are for use in any residential or commercial outdoor location. designed with enhanced nylon and corrosion-resistant metal components weather-resistant receptacles are extra durable. combine WR receptacles with any of our WeatherBox™ while in use protective covers for tough protection against the elements.