The ASTM D4880-2018 standard specifies a test method for evaluating the electrical performance of enameled online insulating varnish in a specific saline solution. This method helps to determine the performance of varnish in enameled online, particularly its resistance to diluted sodium chloride solutions under applied voltage. Values provided in the standard are based on the International System of Units (SI), and metric values are for reference only. The standard does not address all safety issues, and users need to establish appropriate safety, health and environment practices and determine the applicability of regulatory restrictions.