Question: what is the difference between nema 4 and nema 4x?
Answer: As is easily guessed, the NEMA 4X is a subset of the NEMA 4 rating, so it provides the same level of protection against outdoor weather, particularly against dirt, rain, sleet and windblown dust. ... The difference is that the NEMA 4X must provide additional protection against corrosion beyond that provided by the NEMA 4.