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It is permitted to use either the requirements of 2.10.3 for Overvoltage Category I or' u. t! l1 B3 t: p; x; s9 U
Overvoltage Category II, using the PEAK WORKING VOLTAGE; or the requirements in Annex G for2 P; t! }. ]: Q4 L$ c7 c
Overvoltage Category I, Overvoltage Category II, Overvoltage Category III or Overvoltage
* Q7 D. B& F& o8 Y) }Category IV, using the REQUIRED WITHSTAND VOLTAGE, for a particular component or0 g: A5 H" {+ ?! h A) j
subassembly or for the whole equipment.+ X, \) |3 `+ V v2 K: @9 l
% Q5 q$ o p$ k: s# kFor equipment to be supplied from an AC MAINS SUPPLY, the value of the MAINS TRANSIENT/ G1 Q7 G J2 l. X; L" ^- {
VOLTAGE depends on the Overvoltage Category and the AC MAINS SUPPLY voltage. In general,; p0 }; K# ]6 D- ]
CLEARANCES in equipment intended to be connected to the AC MAINS SUPPLY shall be % |" \. o3 a J
designed for Overvoltage Category II.5 h; N* J& A/ Y% s
, ?0 w2 Q @5 A" Y/ j2 ?) A. L/ x- u& Z
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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