Yaskawa SmartTrac AC1 - Manual (Page 79)

SMART TRAC AC1
Technical Manual TM 3554-000Appendix C - Wiring, Grounding and Installation Practices for Noise Immunity
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8-9
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Flex conduit could be used for the Motor leads (PWM signals).
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Multiple panels/cabinets maybe interconnected by bolting together with
star wasters on either side of the bolted connection. When this is done,
the panels/cabinets form a ‘unified ground plane’, which can be
grounded with a single wire to facility ground.
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Grounding Wire sizing shall meet the minimum of equipment
grounding of NEC Table 250-95
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When using wire trays, each of the respective wire groups input power,
output power, AC control, and low voltage need to be routed in their
own respective harnesses, and separated with magnetic barriers.