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Area Electrical accessories / Insulation coordination for low voltage equipment

IEV ref442-09-08

Symbol
fcrit

en
critical frequency
frequency at which the reduction of the breakdown voltage of a clearance occurs

[SOURCE: IEC 60664-4:2005, 3.4]


fr
fréquence critique, f
fréquence à laquelle la réduction de la tension de claquage d’une distance d’isolement apparaît

[SOURCE: IEC 60664-4:2005, 3.4]


de
kritische Frequenz, f

ko
임계 주파수

ja
臨界周波数

pl
częstotliwość krytyczna, f

pt
frequência crítica

sr
критична фреквенција , ж јд

zh
临界频率

Publication date: 2014-11
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