An IP rating is a standard of evaluation that measures how well-sealed an enclosure is against intrusion, foreign bodies, and moisture. ... The two digits represent the level of protection an enclosure has against solid and liquid foreign objects. The first digit represents solids.
Are junction boxes waterproof?
Outdoor electrical junction boxes are designed to keep sensitive electrical connections protected and secure in any environment, even underground. Meeting a variety of NEMA and IP ratings ensures our waterproof junction boxes are robust and durable for outdoor use, but they can also be used for indoor applications.