Rockwell Automation 1336Z SPIDER - FRN 2.xxx-5.xxx - Manual (Page 166)

C–4 CE Conformity
Grounding RFI Filter Grounding
Important: Using the drive with integral optional RFI filter may result
in relatively high ground leakage currents. Surge suppression devices
are incorporated into the drive. The filter must be solidly grounded
(bonded) to the building power distribution ground. Ensure that the
incoming supply PE is solidly connected (bonded) to the same building
power distribution ground.
Grounding must not rely on flexible cables and should not include
any form of plug or socket that would permit inadvertent disconnec-
tion. Some local codes may require redundant ground connections.
The integrity of all connections should be periodically checked.