Sean.Day72
Member
- Location
- Florida
Did research on this but found conflicting answer. I have a 60-hp lift station with the VFD drives located in a adjacent electrical house. Utilities requested a local disconnect be located outside near the pumps for maintenance and make it easier for them to megger the cable. This also satisfies the NEC "line of sight rule" for motor disconnect. VFD cable manufacture says cable grounds shall be unbroken from drive to motor case and "carried through" any disconnects to reduce emf noise. I assume this means I need to run a separate EGC to the disconnect? How is the ground carried through with out touching the disconnect casing?
Also the disconnect will have aux. contacts to shut down the drive if someone turn the disconnect off while pump is running.
Also the disconnect will have aux. contacts to shut down the drive if someone turn the disconnect off while pump is running.