What is meant by NEMA 9?
NEMA 9 indicated dust-ignition proof. The enclosure is intended for indoor use in locations classified as Class II, Division 1, Groups E, F, or G as defined in the National Electric Code. It is designed to prevent the entrance of dust and the enclosed devices do not produce sufficient surface temperatures to ignite dust on the enclosure. Valvcon enclosures are designed to meet NEMA 9 specifications.