信号线英语怎么说及英文翻译

A. 求翻译，英译汉，高手们帮帮忙啊。

No exposed powered electrical connections/terminations are permitted in any external or internal part of the system.
该系统内外不得出现任何裸露的带电接头/端子。

Suitable cables creening must be used where necessary for power, control and signal cables.
如有必要，电源线、控制线、信号线需进行适当屏蔽。

All power cables must be isolated from control and signal cables.
所有电源线需与控制线和信号线隔离。

All power and signal cables must be isolated from one another and all other services.

所有电源线和信号线必须根据各自用途彼此隔离。（这一句英文原文可能有问题！）