24V DC control voltages,grounded (earthed) and ground free.ground_英语解答

24V DC control voltages,grounded (earthed) and ground free.
grounded (earthed)是不是指24V-
ground free指24V+

人气：467 ℃　时间：2020-02-04 05:09:57

解答

grounded是接地吧
窃以为,接地的话不是电势为0了吗?