45.4 Ground fuse
The ground fuse shall be connected between the enclosure and earth ground, with the main input ground connection removed.
The ground fuse shall be connected between the enclosure and the main input power terminal judged least at risk of arcing to earth ground, with the main input ground connection removed. For 3-phase drives, the main input power terminal judged least at risk of arcing to earth ground is the L2 terminal.

最近有在研究UL508C，本身英文不好，对其中的部分意思理解不了，还请大家帮帮忙～
1.main input ground connection removed是如何理解的
2.提到的L2 terminal是指输入L1,L2,L3中的L2吗？

main input ground connection removed:  "main input" 的 "ground connection(中线)"除掉.

这是不是指电源端与输入端的中线不接？

有没有了解的DX帮忙解释一下啊

1.main input ground connection removed是如何理解的
将设备的主接地导体移除，就是说设备地线不接
2.提到的L2 terminal是指输入L1,L2,L3中的L2吗？
指三相中的L2相

Quote:

引用第4楼junpi于2011-11-04 00:31发表的  :
1.main input ground connection removed是如何理解的
将设备的主接地导体移除，就是说设备地线不接
2.提到的L2 terminal是指输入L1,L2,L3中的L2吗？
指三相中的L2相

那请问For 3-phase drives, the main input power terminal judged least at risk of arcing to earth ground is the L2 terminal.这句话怎么理解啊？谢谢

对于三相设备，最不容易对地产生电弧的是L2相