The IEC 60068-2-74 standard specifies a method for fluid contamination testing (Test Xc) to assess the tolerance of electrical and electronic equipment and its components in the event of accidental contact with fluids. This test simulates the liquid contamination environments that equipment may encounter during use, such as fuels, hydraulic oils, cleaning agents, etc., to verify its functional and structural integrity under these conditions. The standard provides detailed test fluid types, test procedures, and selection of severity grades for accidental, intermittent, and persistent contamination scenarios. Through these tests, manufacturers can optimize product designs and ensure equipment Reliability and durability in complex environments.