Which ATSM test method is used for acceptance testing of unprocessed insulating liquids?

The correct choice, ASTM D877, is specifically designed for the evaluation of the dielectric strength of insulating liquids. This method is typically employed to determine the ability of an insulating liquid to withstand electrical stress without breaking down. In the context of acceptance testing for unprocessed insulating liquids, this method is crucial as it provides insights into the liquid’s effectiveness in insulating electrical equipment, ensuring operational safety and reliability.

In contrast, the other methods mentioned serve different purposes. ASTM D3613 relates to specific tests for used transformer oils, while ASTM D7000 is focused on the characterization of insulating liquids mainly used in electrical apparatus. ASTM D2000, on the other hand, pertains to rubber materials in terms of physical properties rather than insulating liquids. Thus, ASTM D877 stands out as the most appropriate test method for evaluating unprocessed insulating liquids in an acceptance testing scenario.