In summary, while NEMA and IP rating systems have differences and the results are not exactly the same, the standards can be used almost interchangeably in many situations. It is important to note that all NEMA/IP rated products have testing available to ensure compliance. Close review of the needs and the environment must be undertaken to verify that the product will meet the operational needs. Also, while modifications can be performed on the box, any openings need to be properly protected and retesting of the final product has to be undertaken to allow for the rating to apply. Contact Bud or DigiKey with any questions and for assistance on selection of the best product for the application.