The standard provides base USCD values for each pollution class. For example, a "Heavy" pollution area (Class D) requires a significantly higher USCD than a "Light" pollution area (Class B) to prevent the tracking of leakage currents across the glass or ceramic sheds. 3. Verification of Insulator Profiles and Geometry
USCD is the total creepage distance of an insulator divided by the highest operating voltage of the system (expressed in mm/kV). IEC 60815-2 maps the SPS classes to minimum nominal USCD values: : 22.0 mm/kV Class B : 27.8 mm/kV Class C : 34.7 mm/kV Class D : 43.3 mm/kV Class E : 54.1 mm/kV 3. Insulator Profile Selection iec 60815-2 pdf
No, this part is specifically for AC systems. Insulators for DC systems are covered by IEC TS 60815-4 and IEC TS 60815-5 . The standard provides base USCD values for each
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