ABB Relion 650 Series Technical Manual page 581

1MRK 506 326-UUS B
Section 17
17.1 Protective ground connections
The IED shall be grounded with a 6 Gauge flat copper cable.
Line distance protection REL650
Technical manual
IED physical connections
The ground lead should be as short as possible, less than 59.06 inches (1500 mm).
Additional length is required for door mounting.
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Section 17
IED physical connections
GUID-109D8403-5C3F-4E51-BA03-24BE9B05739F v2
575