地线 与 零线， 我google 最好的答案

The neutral and ground bus should not be connected (bonded) in the sub panel.

If there is a service disconnect outside, then everything downstream (including your distribution panel) is now considered a sub panel. The only place the neutral and ground can be together is at the service panel (your disconnect outside). The neutral and ground must be isoloated (floating) in a sub panel.

所有跟帖： 

• 太对了，service panel 和 sub panel 就像父子，都是男人，责任不一样。 -上海大男人- ♂ (0 bytes) () 11/17/2020 postreply 21:01:21

• At the main panel, the neutral and the ground are together -orlandomagic- ♂ (0 bytes) () 11/18/2020 postreply 05:23:08