ABB Relion REM601 - Earthing of Relay and Bonding of Sensor Cable Shield; Earthing of Relay

1MDU07212-YN Rev. D Section 6
Installation
REF601 / REJ601 / REM601 81
Application Manual
6.10 Earthing of relay and Bonding of sensor cable
shield
6.10.1 Earthing of relay
The earth lead must be at least 6.0 mm2. If the length of the earth
lead is long, the cross section of the wire must be increased.
To improve the immunity against high frequency distortion it is
recommended to use flat braided copper wire as the earth lead.
To connect a separate earth protection lead:
1. Loosen the protective earth screw to connect a separate earth protection lead.
Figure 34: Location of protective earth screw
The earth lead should be as short as possible but notice that extra
length is required for door mounting.
Each IED must have its own earth lead connected to the earth
circuit connector.
2. 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.