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 rob. 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.Don't Let a Rainstorm Cause You Electrical Problems at Home! When the rain begins to fall, the situation outside can become perilous if you have not properly prepared all outdoor electrical outlets and electric boxes so they are safe and waterproof.Install the Right Kind of Outlets You also have to make sure these outlets are installed correctly, with adequate grounding, the proper external mounting brackets, and a waterproof cover to keep moisture out of the electrical box.