EN 60660:1999

1 General
      1.1 Scope and object
      1.2 Normative references
      1.3 Definitions
      1.4 Values which characterize 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
      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
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications

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 EN 60071-1, and a frequency not greater than 100 Hz. Composite insulators are not covered by this standard. The object of this standard is - to define the terms used, - define electrical and mechanical characteristics of post insulators of organic material and to prescribe the conditions under which the specified values of these characteristics are verified, - to prescribe methods of testing, - to prescribe acceptance criteria. This standard does not give numerical values for insulator characteristics, nor does it deal with a choice of insulators for specific operating conditions. HD 578 S1 specifies numerical values for electrical and mechanical characteristics and gives the dimensions necessary for interchangeability of post insulators.