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It is permitted to use either the requirements of 2.10.3 for Overvoltage Category I or
/ c/ g& v3 |2 B# MOvervoltage Category II, using the PEAK WORKING VOLTAGE; or the requirements in Annex G for
9 G8 G. T2 |( S2 R. d7 H( _ W" e5 @Overvoltage Category I, Overvoltage Category II, Overvoltage Category III or Overvoltage+ ^6 Q' g2 {6 @ O: r
Category IV, using the REQUIRED WITHSTAND VOLTAGE, for a particular component or
' c3 Y5 S# }) d5 s/ ]subassembly or for the whole equipment.
% P+ \3 o( u0 J/ h: Z3 o4 J+ T3 x
7 p! y2 g D6 H$ fFor equipment to be supplied from an AC MAINS SUPPLY, the value of the MAINS TRANSIENT8 x( M3 J; N( r* ~/ u
VOLTAGE depends on the Overvoltage Category and the AC MAINS SUPPLY voltage. In general,
. D& Q, W, x, Q* m6 r* dCLEARANCES in equipment intended to be connected to the AC MAINS SUPPLY shall be
' d+ D0 N$ D+ e" g; o6 e7 Ydesigned for Overvoltage Category II.
$ P! S4 q2 f8 n1 u$ y7 u- N1 i* H5 _* F; X! {$ }
从第一段里可以看到过压等级分成了四个等级,而第二段只说接交流电的为过压等级二,那其它的是怎么判断的啊?哪位大侠知道,指点指点,万分感谢。 |
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