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引用第9楼anpup2010于2011-07-28 16:55发表的 :# t1 S' j7 e0 [" b% _7 |2 n
正确认案件 4.6mm, 且现在所有的认证单位都接受这种算法(TUV, UL, NEMKE, ITS都接受的),并且从标准出发,也是有根据,是正确的。
, e3 l$ h+ `6 x: j' |! \6 s重点: 请不要忘记表格2K, “PEAK WORKING VOLTAGE a”, 在峰值电压有备注一个小“a”, 对应到这个表格下面的备注,就是“a If the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage, see 2.10.3.3 b) regarding additional CLEARANCES.
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0 j" ^5 {7 G9 H( a' B/ {: H借上面兄弟的标准描述:
" ]! z6 ?$ a+ s6 Z' F! O5 nFor an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):
9 z. A! y j) L, o8 |....... 9 l# `7 @! m" z2 U" c" N+ J! A
working volatge Upeak is 612V,according to Table 2K, we should refer to 840V (6.4mm). why you choose 420V(4mm)? |
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