什么情况下电路需要断零线？比如有些场合断路器要求可以断火线时也要断零线

显示全部楼层 · 2011-10-5 18:42:16

单相交流电的断路器要求也要断零线，防止火线零线接反造成危险。...

千问 · 2011-10-5 18:42:16

双回路供电的电源，断路器要求断火线时也要断零线，两个回路的零线任何时候接通。...

千问 · 2011-10-5 18:42:16

一般民用电器不希望在开断电源时将零线断开，一确保人身安全。但是工业中一般都需要将火线和零线同时断开。在煤矿等有易燃易爆气体的工作场所，断开电源时应当同时断开零线...

千问 · 2011-10-5 18:42:16

断零线只是为了更好保护，例如220V通电之后，通俗讲没有零线火线之分，除非你在主线上有明确标示，否则还是都断安全...

千问 · 2011-10-5 18:42:16

English is more important now. But it is difficult for many students to study it. Now I make some suggestion, maybe can help you. First, you should......