Best Practice: Unshielded data cable vs. power cable requires 12 inches of separation unless a listed barrier or separate raceway is used. The National Electrical Code establishes specific minimum distances when communications cables must run near power and light circuits. This safety zone also mitigates most EMI, and power induction issues. 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. Copyright © 2008 by the Institute of Electrical and Electronics Engineers, Inc. by Jeanna Deese and Chris Rivas Power over Ethernet—it may be an old concept, but new applications continue to be identified that are redefining. As well as looking at what distance between power and data should be adhered to, we look at the effects of Electromagnetic Interference (EMI). This document details the requirements with regard to installing Structured Cabling Systems (SCS) in the vicinity of power circuits normally associated with. I have faced a problem similar to this, for a new Equipment installed and started - the distance between LT Power Cable and Optic Fibre was close to each other and the distance was about 10O MM, in the same cable tray.