This guide walks you through the simple decision steps engineers use, the common strand counts on the market, and clear rules-of-thumb for different project types so you choose a cable that fits both today's needs and tomorrow's growth. In this blog, we will explore the key rules for fiber optic cable routing in a Fiber Distribution Box to ensure optimal performance and longevity of your fiber optic network. Firstly, capacity and compatibility are essential factors to evaluate. The box should have sufficient capacity to accommodate the expected volume of optical cables while being compatible with the specific network. The Fiber Optic Association, Inc. If you only have one cable for your conduit, please use only the first cable diameter field.