英语翻译DC control voltages,grounded (earthed) and ground free.grounded (earthed)是不是指24V-ground free指24V+24V正 在工程上英语怎么说 是ground free？

英语翻译DC control voltages,grounded (earthed) and ground free.grounded (earthed)是不是指24V-ground free指24V+24V正 在工程上英语怎么说 是ground free？
英语翻译
DC control voltages,
grounded (earthed) and ground free.
grounded (earthed)是不是指24V-
ground free指24V+
24V正 在工程上英语怎么说 是ground free？

英语翻译DC control voltages,grounded (earthed) and ground free.grounded (earthed)是不是指24V-ground free指24V+24V正 在工程上英语怎么说 是ground free？
DC Control voltage DC控制电压
grounded (earthed) and ground free.接地(接地)和不接地.

直流控制电压
接通地的 (就是 0 V)

grounded (earthed）接地线
ground free 不接地线