DIN VDE 0660-507:1997
用外推法评估经部分型号检验的低压开关控制装置组件温升
A method of temperature-rise assessment by extrapolation for partially type-tested assemblies (PTTA) of low-voltage switchgear and controlgear (IEC 60890:1987 + Corrigendum 1988 + A1:1995); German version HD 528 S2:1997