You're right to question the absence of a grounding/bonding bushing. Here's the breakdown of why you likely need one and why the electrician's argument is probably flawed

Why you need a grounding/bonding bushing (or equivalent):
Metal Raceway Termination

The core principle is that any metal raceway (conduit, LB, etc.) that contains energized conductors and terminates in a non-conductive box MUST be bonded to the grounding system.

Fault Current Path

The primary reason for bonding is to provide a low-impedance path back to the source in the event of a ground fault. If a wire inside the metal LB shorts to the LB itself, without proper bonding, the fault current won't have a safe, reliable path back to the panel. This can create a dangerous voltage on the LB, posing a shock hazard.

NEC (National Electrical Code) Requirements

The NEC mandates this. Some relevant sections (check the most recent edition in your jurisdiction) are likely to include:

250.4(A)(5): Effective Ground-Fault Current Path. Requires an electrically continuous ground-fault current path capable of safely carrying the fault current. 250.92(A) Bonding of Metal Raceways and Enclosures. Requires bonding of metal raceways, cable trays, and enclosures that contain service conductors or act as a fault current path. 314.40(A) Metal Boxes. Specifically addresses the connection of metal raceways to boxes. 250.104(B) Other Metal Piping and Metal Raceways. Might apply, depending on the specific situation, requiring bonding of other metal elements to ensure they're at the same potential. Safety

The entire electrical system is designed around the concept of a low-impedance ground fault path. Properly bonding the metal LB is a crucial part of that safety system.

Why the electrician might think it's not needed (and why they're probably wrong)



"It's a short piece of conduit"

The length of the metal LB is irrelevant. If it's metal, it's potentially conductive, and it needs to be part of the grounding system. Even a short LB can become energized during a fault.

"It's going into PVC"

The fact that the other end of the LB is going into PVC doesn't negate the need to bond the metal LB to the grounding system. The termination in the PVC box is what triggers the bonding requirement.

"The RX is grounded at the panel"

While the conductors should be grounded back at the panel, that doesn't guarantee a low-impedance fault current path if the metal LB becomes energized. The ground wire inside the RX cable isn't sufficient on its own to handle the fault current that could flow through the LB.

Misunderstanding the Code

It's possible the electrician is misinterpreting the code or has a specific (and unusual) situation in mind that he's not communicating clearly.

How to Correctly Bond the LB


Grounding/Bonding Bushing

Install a grounding/bonding bushing on the LB where it enters the PVC box.2.

Grounding Conductor

Connect a grounding conductor (e.g., green wire) from the grounding/bonding bushing to the grounding terminal in the PVC box or to an existing ground wire within the box.3.

Continuity

Ensure that the grounding system is properly connected back to the main grounding electrode system at the service panel.

Important Considerations



Local Codes

Always check and follow the specific electrical codes enforced in your local jurisdiction. They may have additional requirements or interpretations.

AHJ (Authority Having Jurisdiction)

If there's any doubt, consult with your local electrical inspector (AHJ). They have the final say on whether the installation meets code.

Documentation

Ensure that the bonding is properly documented, especially in solar installations, as it's a critical safety aspect.

Rx (Romex) runs through the basement

It might be required to be in conduit anyway depending on its installation.*

Stucco wall

Weatherproof LBs should be used when penetrating exterior walls

In Summary:

You are very likely correct. The metal LB, by terminating in a non-conductive box while containing energized conductors, necessitates bonding to the grounding system. A grounding/bonding bushing (or an approved equivalent) is the most common way to achieve this. Don't let the electrician's claim go unchallenged; it's a potential safety hazard. Consult the NEC and your local AHJ to confirm the requirement and ensure proper installation. Flag for review