The test condition for FUE according to IEC 60950 Annex U voltage:

a)      For reinforced insulation used in ITE equipment is to use the appropriate test voltage as specified in the electric strength tests, in the Standard for   Information Technology Equipment - Safety - Part 1: General Requirements, UL 60950-1, or 3000 V rms, whichever is greater;
b)     For reinforced insulation used in medical equipment is to use the appropriate test voltages as specified in the dielectric strength tests, Standard for Medical Electrical Equipment, Part 1: General Requirements for Safety, UL 60601-1, or 3000 V rms, whichever is greater;
c)      For basic or supplementary insulation is to use the appropriate test voltage as specified in the electric strength tests, in UL 60950-1, or 1500 V rms, whichever is greater.

Remark : The Second Edition of IEC 62368-1 has been published in early 2014 and in the next five years this edition will replace the current safety standards for information and communications technology equipment (60950-1) and consumer electronics (60065).  Since IEC 62368-1 is a new standard and not a simple merger of IEC 60065 and IEC 60950-1 it is important for manufacturers to prepare for the new standard and its hazard-based and performance-oriented approaches compared to the more prescriptive approach of the existing legacy standards.