BS EN 61858-2:2014 PDF

1   Scope This part of IEC 61858 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.