A NEMA 3R enclosure is a standard rating for electrical boxes that are designed to be used outdoors and are resistant to rain, ice, and dust. In HVAC, your Disconnect Switch and external Control Boards are always housed in NEMA 3R-rated metal or plastic cabinets. This rating ensures that your Mobile Home AC Condenser remains safe from electrical shorts during even the worst thunderstorms. You can find various code-compliant enclosures and electrical components in our Parts collection. Using the correct NEMA-rated enclosure is a mandatory requirement for passing a professional electrical inspection. These boxes feature "knockouts" for conduit and a weather-tight door to protect the internal wiring. All of our ACIq and MrCool outdoor equipment is built into NEMA-rated chassis for long-term safety. It is the global standard for protecting electrical connections from the elements.