求翻译：供电系统的接地型式采用TT制，所有插座回路均设置漏电保护装置，动作电流30mA。所有正常情况下不带电的设备外壳均应与PE接地保护线可靠连接。是什么意思？

Grounding of power supply system using the tt system, all socket circuit are set to a leakage protection device, the action current of 30ma. Uncharged under all normal conditions the equipment enclosure shall be with pe ground protection line and reliable connection.

Power system grounding-type-system, all with TT outlet circuit leakage protection devices are all set to move current mA 30. Under normal circumstances all live is not the case with PE reliable ground wire connection.

The power supply system earth pattern uses the TT system, all plug return route establishes the leakage protective device, working current 30mA.In all normal conditions not the charged equipment outer covering should and the PE earth guard wire reliable connection.

Grounding type power supply system using-TT, all are fitted with electric leakage protection device of socket circuits, current of 30mA. Under all normal conditions without electrical equipment enclosures are reliable connections and grounding protection of PE line.