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引用第5楼luqing_sz于2009-01-06 13:07发表的 :
5 G$ c# m# a$ F' e8 v- ?
8 Q& X) {: W9 ?% r! C- l( Q- V29.1 !Clearances shall not be less than the values specified in Table 16, taking into account the rated impulse voltage for the overvoltage categories of Table 15, unless, for basic insulation and functional insulation, they comply with the impulse voltage test of Clause 14. However, if the construction is such that the distances could be affected by wear, by distortion, by movement of the parts or during assembly, the clearances for rated impulse voltages of 1 500 V and above are increased by 0,5 mm and the impulse voltage test is not applicable. 故马达绕组与接地金属的爬电距离为:1.5+0.5=2.0mm.故楼主的产品已符合安规.
5 }0 j$ m+ p* E7 L多謝樓上的詳細回復!但我還有一點疑問:“the clearances for rated impulse voltages of 1 500 V and above are increased by 0,5 mm and the impulse voltage test is not applicable”,如果對應表16的脈沖電壓1500V增加0.5mm(0.5mm注明:但如果是污染等級為3時,該值增加到0.8mm).6 K' ^4 ?9 g6 F( F, R
4 j& X4 L2 x3 X3 a( m, B3 |如果按此理解,是不是马达绕组与接地金属的爬电距离應改为:1.5+0.8=2.3mm。不知是否這樣計算? |
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