333 (c) (3) requires a minimum distance of 10 feet (3. 05 m) from overhead lines under 50 kV, and an additional 4 inches for every 10 kV over 50 kV. Why is it Important for Electrical Safety? It outlines the safe distance workers must maintain when working. OSHA 29 CFR 1910. 4 Pathway Separation Between Telecommunication Cables and Power Cables Communications cables are, by design or necessity, often installed in close proximity and/or in the same pathway as power service cables. These requirements are now distributed across Chapter 7—primarily Articles 725, 760, 770, 805, and 820. Its current version (ANSI/TIA/EIA/-569-B) was published in October 1, 2004 and describes EMI aspects in Article 10.