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引用第9楼anpup2010于2011-07-28 16:55发表的 :% ~+ ~, \* j4 u; z% L- g5 [, \
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。' u; @$ h' ^! b i
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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借上面兄弟的标准描述:
1 T& q" a1 H/ p; b e, G' ^# l8 AFor an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):. F2 E; n. X6 B6 e5 M
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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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