用IEC的话来回答:
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.
所以是3.0加0.5. 不知是这样否?作者: fumsga 时间: 2012-1-10 21:10
需根据不同的产品,不同的地方都不同的,具体问题具体分析.作者: 日夏清 时间: 2012-1-10 21:12
同意yinke的答案