60950-1 4.3.6章节和61558中19.15章节 扭矩测试

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60950-1 4.3.6章节和61558中19.15章节 扭矩测试 为什么不能超过0.25Nm？？
怎么理解这个8mm的？？

3 V# L  N3 z& C0 B; x* }19.15 Transformers provided with pins intended to be introduced into fixed socket-outlets
shall not impose undue strain on these socket-outlets.
Compliance is checked by inserting the transformer, as in normal use, into a fixed socketoutlet
complying with IEC 60083, the socket-outlet being pivoted about the horizontal axis
! t' m& c4 J9 M6 F  G6 {, Uthrough the central lines of the contact tubes at a distance of 8 mm behind the engagement
' O, ]7 W0 Q6 J- j- T& r) }face of the socket-outlet.
% N0 n* y! B$ @$ I" O" Q  SThe additional torque which has to be applied to the socket-outlet to maintain the engagement
+ f  p! I2 T$ u8 Dface in the vertical plane shall not exceed 0,25 Nm.