When selecting a lighting fixture or any electric enclosure, it is important to note the environment in which it will be used. The National Electrical Manufacturer’s Association (NEMA) and the International Electrotechnical Commission (IEC) have developed NEMA and IP ratings, a system to help you determine the level of protection an enclosure provides from dust and water.
NEMA Ratings
NEMA ratings are based on a two-digit system. The first digit indicates the level of protection from solid objects, such as dust, and the second digit indicates the level of protection from water. The higher the number, the greater the level of protection. For example, a NEMA 1 enclosure provides a degree of protection of the equipment inside the enclosure against falling dirt, while a NEMA 4X enclosure is protected from the ingress of water, ie. rain, sleet, snow, hose directed water and corrosion.
IP Ratings
IP ratings are based on an established enclosure grading system developed by the IEC.. The first digit indicates the level of protection from solid objects, while the second digit indicates the level of protection from dust, Like the NEMA ratings, he higher the number, the greater the level of protection. For example, an IP65 enclosure rating provides protection from low pressure jets or water from all directions (causing no harmful effects), while an IP from dust and jets of water from any direction, while an IP68 enclosure provides protection against the effects of temporary immersion in water.
NEMA & IP RATING CHART
