You are correct. You would not use a Metallic Insulated Grounding Bushing (MIGB) on the end of PVC conduit entering a manhole.Here's why: MIGBs are for metallic conduit

MIGBs are designed to provide a grounding connection for metallic conduit (like EMT or rigid metal conduit) where it enters an enclosure. They bond the conduit to the enclosure's grounding system.

PVC is non-conductive

PVC is a plastic material and an insulator. It doesn't conduct electricity, so there's no electrical connection to be made with a MIGB.

Proper PVC termination

When using PVC conduit entering a manhole, you would typically use a PVC coupling or adapter to connect the conduit to the manhole wall. Sealing the penetration to prevent water ingress is also crucial.

Grounding Considerations: For grounding conductors within the PVC conduit, you'll typically run an insulated grounding conductor alongside the circuit conductors. The grounding conductor is connected to the equipment grounding system within the manhole.In summary, using a MIGB on PVC conduit is both unnecessary and incorrect due to the non-conductive nature of PVC. Flag for review