The ANSI/NETA Standard for Electrical Commissioning Specifications for Electrical Power Equipment and Systems was developed for use by those responsible for testing and commissioning newly installed or retrofitted electrical power systems and equipment to guide them in specifying and performing the necessary inspections, tests, measurements, and system performance verification to commission an electrical power system infrastructure. This document aids in ensuring safe, reliable operation of the electrical power equipment and systems. It is essential to commission newly installed and retrofitted electrical power equipment and systems. Additionally, acceptance testing of the equipment provides the baseline test results for maintenance programs and equipment trending, while commissioning verifies the electrical equipment and system meets the owner's project requirements and basis of design. The 2020 ANSI/NETA Standard for Electrical Commissioning Specifications for Electrical Power Equipment and Systems is the second edition and most current revision of this document, and was approved as an American National Standard on September 9, 2019. New in ANSI/NETA ECS-2020 Updated Commissioning Process Updated Commissioning and Inspection Procedures for Low, Medium, High, and Extra-High Voltage Systems