Question: is nema 4 better than nema 12?
Answer: For example, NEMA 4 offers more stringent protection than NEMA 12. ... NEMA 3: For indoor or outdoor use. Same as NEMA 2 but adds stronger protection against the ingress of water and dust. It protects against windblown dust, rain, sleet, and snow and will be undamaged by ice forming on the enclosure.