Control Panel Enclosures. These enclosures are cabinets designed for housing electrical or electronic equipment, protecting equipment from the environment, and for protecting users from shock or injury. Front panels provide access to switches, knobs, and displays. The National Electrical Manufacturers Association (NEMA) publishes standards for the performance of various classes of electrical enclosures. These standards cover corrosion resistance and the ability to protect from rain and submersion. Some enclosures are provided with partially punched openings that can be removed to accommodate cables, connectors, or conduits.