EN 61858-2:2014

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General considerations
5 Substitution of phase insulation and/or
   ground insulation
6 Substitution of winding wire
7 Substitution of impregnating resin/varnish
8 Evaluation of additions
9 Procedure C - Single-point thermal ageing test
10 Full thermal aging test (procedure D)
Annex A (normative) - Classes of winding wire
Annex B informative) - Visual representation of form-
        wound coil manufacturing process
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

IEC 61858-2:2014 lists the required test procedures for qualification of modifications of an established electrical insulation system (EIS) with respect to its thermal classification. This standard is applicable to EIS used in form-wound electrotechnical devices. The test procedures are comparative in that the performance of a candidate EIS is compared to that of a reference EIS, which has proven service experience in accordance with IEC 60505 or has been evaluated by one of the procedures given in IEC 60085 and IEC 60034-18-31.