In this paper, the author examines the various characteristics of electric drive enclosures labeled NEMA 1 and UL Type 1, detailing the differences and similarities, with an explanation of why the NEMA 1 enclosure rating does not meet the new UL Type 1 enclosure rating, while products with the UL rating do indeed meet and exceed all relevant requirements of the NEMA specification for use in the U.S. industrial and building markets.
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