For such cables, we recommend using at least a 1. It's important to consider not only the rigidity of the jacket but also the breakout point of the assembly, where the strands exit the jacket and are encased in. The size of conduit you should use depends on the type of fiber optic assembly and the number of cables it will house. For example, our TikTok video below shows a. Premise innerduct is a flexible, non-metallic, corrugated raceway that has long been an essential conduit system for protecting fiber optic cables installed throughout telecommunications spaces and pathways. In this comprehensive guide, we will walk you through the process of choosing the right conduit for your fiber optic installation. What is the role. The conduit sizing calculator is a helpful tool for engineers to answer questions regarding the size conduit to use per NEC® guidelines. Enter your information in the fields below and click “Calculate” at the bottom of the page. " To determine the size of.