EN 61858:2008

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General considerations
5 Evaluation of the change of thickness of an EIM
   5.1 Samples
   5.2 Acceptance
6 Substitution of winding wire
   6.1 General
   6.2 Substitution of enamel
   6.3 Substitution of conductor material
   6.4 Alternate winding wire
7 Substitution of impregnating resin/varnish
   7.1 Thermal class determination
   7.2 Evaluation
        7.2.1 Thermal classes equal or better
        7.2.2 One thermal class lower
        7.2.3 Other criteria
8 Substitution with other EIM
   8.1 Technically equivalent materials
   8.2 Previous evaluation
   8.3 Other
9 Evaluation of additions
   9.1 Addition of an impregnating resin/varnish
   9.2 Addition of other components
10 Single-point thermal ageing test
   10.1 Test objects
   10.2 Establishing the EIS relative thermal endurance
        index (EIS RTE)
   10.3 Interpretation of results
Annex A (normative) Classes of winding wire
Annex B (normative) Compatibility test procedure
Annex ZA (normative) Normative references to
         international publications with their corresponding
         European publications
Bibliography

Provides the required test procedures for qualification of modifications of an established electrical insulation system (EIS) with respect to its thermal classification.