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.