NBN EN 61857-1 : 2009

INTRODUCTION
1 Scope
2 Normative references
3 Definitions
4 General considerations
    4.1 Overview of test procedure
    4.2 Basis of evaluation and qualification
    4.3 Specific requirements
5 Test objects
    5.1 General
    5.2 Description
    5.3 Number of test objects
6 Test procedures
    6.1 General
    6.2 Initial screening tests
    6.3 Thermal ageing
    6.4 Prediagnostic mechanical stress
    6.5 Other prediagnostic requirements
    6.6 Moisture exposure
    6.7 Dielectric diagnostic tests
    6.8 Other diagnostic tests
7 Analyzing, reporting, and classification
    7.1 Criteria of failure
    7.2 Method of determining life
    7.3 Extrapolation of data
    7.4 Report of results
Annex A (informative) Bibliography
Annex ZA (Normative references to international publications with
their corresponding European publications

Defines a general test method for the thermal evaluation and qualification of electrical insulation systems (EIS) and determines a method for comparing the performance of a candidate EIS to a reference EIS. Applies to existing or proposed EISs used for electrotechnical products which have an input voltage not in excess of 1000 V when the thermal factor is the dominant ageing factor.