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Revised Standard for Electrical Equipment Enclosures Features New Test Methods, Protection Requirements

01/15/2019 11:00AMSign-up to receive press releases.

ROSSLYN, Va.—The National Electrical Manufacturers Association (NEMA) revised NEMA 250-2018 Enclosures for Electrical Equipment (1000 Volts Maximum), a Standard that covers enclosures for electrical equipment rated not more than 1000 V and 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. These latest changes include a pressure wash test method that provides the industry with a location to go to 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," said Garrett Rettig, Project Engineer II at Allied Moulded Products, NEMA Enclosures (05EN) Section Chairman.

NEMA 250-2018 is available in hard copy and as an electronic download for $145 on the NEMA website.


The National Electrical Manufacturers Association (NEMA) represents nearly 325 electrical equipment and medical imaging manufacturers that make safe, reliable, and efficient products and systems. Our combined industries account for 370,000 American jobs in more than 6,100 facilities covering every state. These industries produce $124 billion in shipments and $42 billion in exports of electrical equipment and medical imaging technologies per year.

Press contact:
Tracy Cullen


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