NEMA 1 refers to a specific type of electrical enclosure defined by the National Electrical Manufacturers Association. It is designed for indoor use and provides a basic level of protection against dust and light contact with electrical components. These enclosures are commonly used in residential and commercial applications for housing electrical devices and controls. The NEMA 1 rating indicates that the enclosure is not weatherproof, making it unsuitable for outdoor use. It is typically made from materials like steel or plastic and is often used in applications such as lighting controls, switchgear, and distribution panels.