Connecting Protective Earthing - ABB RELION 620 Series Installation Manual

1MRS757641 G
5.3

Connecting protective earthing

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620 series
Installation Manual
The earth lead must be at least 6.0 mm
cross section of the wire must be increased.
Use fine copper wire as the earth lead.
Loosen the protective earth screw (T20) to connect a separate earth protection
lead.
Figure 30: The protective earth screw is located between connectors X100 and
X105
The earth lead should be as short as possible but extra length is
required for door mounting.
Each protection relay must have its own earth lead connected to the
earth circuit connector.
Connect the earth lead to the earth bar.
Use either stripped wire screwed between a washer cup and the protective
earth screw or a ring lug.
Select a suitable ring lug to fit under the M4 screw.
Tighten the protective earth screw.
Support the earth lead so that it cannot break or weaken.
Be aware of the mechanical, chemical and electrochemical environment.
2
. If the earth lead is long, the
Connecting
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