10 km (6 miles): Commonly used in urban networks with minimal loss. Separating high-voltage power cables from low-voltage communication cables is a fundamental requirement in any electrical installation. This practice is mandatory for two distinct reasons: ensuring the safety of the structure and its occupants, and preserving the integrity of sensitive data. When there are two different voltage ratings on cables, separation, either mechanical or by distance, is to avoid an insulation breakdown of the higher rated cable from breaking down the insulation and entering the lower voltage system. Other than that you haven't provided much information, given. Need some clarification about NEC 770. Let's dive deeper together! What Factors affect the fiber optic cable distance?Maintaining proper separation between power, data, and limited energy cabling is foundational to system performance, safety, and code compliance. Separation isn't just an EMI precaution — it protects signaling, reduces rework, and ensures pathways meet inspection expectations across risers. Abstract:The design, installation, and protection of wire and cable systems in substations are covered in this guide, with the objective of minimizing cable failures and their consequences.