Connecting Protective Earthing; Connecting Protective Earthing To Relay; Connecting Protective Earthing To Local Hmi - ABB RELION REX640 Installation Manual

Connecting
5.3

Connecting protective earthing

5.3.1

Connecting protective earthing to relay

Connect the protection relay to earth using a 6 mm
cable. Use an earth lead of maximum 1.5 m (4.9 ft). Extra length is required for door
mounting.
1.
2.
3.
4.
5.
70
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A 16 mm (AWG 6) flat braided copper cable is recommended for more
demanding EMI environments, such as installations where the relay is
mounted inside a gas insulated switchgear.
Using a TX30 screwdriver, loosen the protective earth screw to connect a
separate earth protection lead.
Figure 62: Location of the protective earth pin
Each protection relay must have its own earth lead connected to the
earth circuit connector.
Connect the earth lead to the earth bar.
Thread the copper cable on the protective earth.
Tighten the protective earth screw to 6 Nm ±5% (4.4254 ft-lb ±5%).
Support the earth lead so that it cannot break or weaken.
Observe the mechanical, chemical or electrochemical conditions.
1MRS759115 E
2
(AWG 10) flat braided copper
Installation Manual
REX640