This report describes Phase I of a two- phase project to assess industry practices and standards for grounding and bonding of medium-voltage underground residential distribution (URD) and underground commercial distribution (UCD) circuits and worker safety in worksites with. This report describes Phase I of a two- phase project to assess industry practices and standards for grounding and bonding of medium-voltage underground residential distribution (URD) and underground commercial distribution (UCD) circuits and worker safety in worksites with. Abstract: The design, performance, use, testing, and installation of temporary protective grounding systems, including the connection points, as used in permanent and mobile substations, are covered in this guide. Copyright © 2021 by The Institute of Electrical and Electronics Engineers, Inc. Grounding is a mechanism to protect distribution equipment and people under normal operating conditions, abnormal operational (overcurrent and overvoltage) responses, and hazardous conditions such as shocks. Grounding is necessary to assure correct operation of electrical devices, to assure safety. Whether you're a seasoned pro or just starting out, this comprehensive guide will give you practical insights into proper grounding techniques, with a special focus on how selecting quality materials from a reliable building material supplier impacts your entire system's safety and longevity. Each DISTRIBUTION BOX and controller must be grounded. 26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used. Grounding distribution boxes and cable shields feels technical, but it"s deeply human.