IEC 60660:1999

Foreword
1 General
      1.1 Scope and Object
      1.2 Normative References
      1.3 Definitions
      1.4 Values which characterise a post insulator of
             organic material
      1.5 Documentation
      1.6 Normal Service Conditions
2 General Requirements for Tests
      2.1 Classification of Tests
      2.2 Quality Assurance
      2.3 General Requirements for Electrical Tests
      2.4 Lightning Impulse Voltage Tests
      2.5 Power-Frequency Voltage Tests
      2.6 Standard Reference Atmospheric Conditions for
             Tests
      2.7 Correction Factors for Atmospheric Conditions
3 Type Tests
      3.1 General
      3.2 General Requirements for Electrical Type Tests
      3.3 Dry Lightning Impulse Withstand Voltage Test
      3.4 Dry Power-Frequency Withstand Voltage Test
      3.5 Partial Discharge Extinction Voltage Test
      3.6 Lightning Impulse Puncture Test
      3.7 Mechanical Failing Load Test
      3.8 Test for Deflection Under Load at Normal Ambient
             Temperature Conditions
      3.9 Test for Mechanical bending strength as a
             function of temperature
      3.10 Water Absorption Test
      3.11 Ageing and Humidity Test
      3.12 Flammability Test
      3.13 Temperature Cycle Test
4 Sample Tests
      4.1 General
      4.2 Verification of Dimensions
      4.3 Re-Test Procedure
5 Routine Tests
      5.1 General
      5.2 Visual Examination
      5.3 Mechanical Routine Test
      5.4 Electrical Routine Test and Partial Discharge
             Measurement
Annex A (informative) Tolerances of Form and Position

Applicable to post insulators of organic material for indoor service in electrical installations or equipment operating in air at atmospheric pressure on alternating current with a nominal voltage greater than 1 000 V up, but not including, 300 kV, as defined by range I of IEC 60071-1, and a frequency not greater than 100 Hz. Composite insulators are not covered by this standard.