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TECHNICAL SPECIFICATION INSULATING LIQUIDS : NATURAL ...· PDF file3 IEC 60156 Insulating Liquids - Determination of the breakdown voltage at power frequency – Test method. 4 IEC 60247 Insulating liquids – Measurement of relative permittivity, dielectric dissipation factor (tan į) and d.c. resistivity of insulating liquids, 5 IEC 60475 Method of sampling liquid dielectrics.

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