Check the details of your Fiber Optic Splice Enclosures. For outdoor setups, make sure the enclosure has weatherproof ratings like IP66 or NEMA Type 4X to handle tough conditions. In this technical guide, we will explain exactly what the IP68 waterproof standard means, why it is critical for telecommunications, and what structural features define a professional-grade enclosure. What is an IP Rating? Decoding “IP68” “IP” stands for Ingress Protection, a standard defined by. A fiber optic splice closure, also known as a fiber optic splicing enclosure, is a device designed to house and protect fiber optic splices, ensuring secure connections in both indoor and outdoor environments. Two common ones are NEMA and IP ratings.