The National Electrical Manufacturers Association (NEMA) has revised NEMA 250-2018 Enclosures for Electrical Equipment (1000 Volts Maximum). This Standard covers enclosures for electrical equipment rated lower than 1000 V that is intended to be installed and used for non-hazardous (unclassified) locations and hazardous (classified) locations.

Changes to this edition of NEMA 250 include enclosure types 7 and 9 for hazardous/classified locations as permitted by the National Electrical Code, pressure wash ancillary ratings, a high-pressure power wash test, revisions to enclosure types and revised outdoor corrosion protection requirements.

“The NEMA Enclosures Section has made valuable additions to the NEMA 250 publication,” said Garrett Rettig, project engineer II at Allied Moulded Products, NEMA Enclosures (05EN) Section Chairman, in a press release. “These latest changes include a pressure wash test method that provides the industry with a location to go for the test method, revised outdoor corrosion protection requirements and revisions to enclosure types. With these changes, NEMA 250 continues to be a useful tool for the industry.”

NEMA 250-2018 is available in hard copy and as an electronic download on the NEMA website.