Consider the following scenario. A 240/120-V split-phase overhead service. The service conductors from the pole-mounted utility-owned transformer come overhead with a guy wire. They enter a weather head, and travel down in conduit, where they reach the meter, and continue and reach the soil level. Then they travel through underground conduit, reach a manhole, and then continue underground. They come across a 90-degree bend and reach the surface, then they continue and reach the service disconnect. Is it allowed by the Code to ground the neutral wire at the manhole? And, is it allowed to connect the supplemental ground rod directly to the neutral wire, instead of connecting it to the first rod? This is shown below, where the phase wires are omitted for simplicity.
Figure 1. Image source: own.
Edit: Suppose there are actually two manholes, each with a ground rod, to comply with the minimum 1.8-meter distance between them (section 250.53(A)(3).) Also, I’ve clarified the meter, service disconnect and panel were attached to a wall of a house outside, perhaps in the backyard. And also that the ground rods under consideration are not those from the utility. Like this:
Figure 2. Image source: own.