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引用第9楼anpup2010于2011-07-28 16:55发表的 :
& I) w4 h% v6 J9 w) k- l0 K; L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" [% l; m, N$ @; h6 l: Y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.
4 c" `9 d6 J) G% d0 T/ O, g
- m ~% r8 Y" V+ h9 \借上面兄弟的标准描述:, Y& m1 x2 r* ^6 e: N' Q9 Y
For an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):. a# T( M. \3 b" r% } ~* J
....... * e8 A) L5 P. v3 W/ E
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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