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Section 2.15 of ICEA T-27-581/NEMA WC 53 specifies the wet insulation resistance stability test for 600-2000V rated cables. Specimens are placed in a water bath at rated insulation temperature and energized continuously at 600V AC.
Insulation resistance is measured after 1, 7, and 14 days, then weekly for 12+ weeks. Maximum decrease rate: 4% per week (12 weeks) or 2% (24/36 weeks). This test verifies long-term insulation integrity under continuous wet operating conditions.