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NEC Figure 250.1.

The grounded neutral conductor provides a current return path for anything utilizing a neutral supplied from the secondary side of the transformer.

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Each grounded conductor shall terminate within the panelboard in an individual terminal that is not also used for another conductor.

Many raceway types qualify as an equipment grounding conductor.

The main bonding jumper is connecting the grounded circuit conductor, the equipment grounding conductor busbar, and the supply-side bonding jumper to the service enclosure.

The supply-side bonding jumper ensures the required electrical conductivity between metal parts required to be electrically connected.

Notice the paint scraped off from the pipe before the grounding clamp was installed. Not a bad idea to paint the surface after the clamp is installed to avoid future rust.

Reconnecting a grounded conductor to ground on the load side of the service disconnect is prohibited unless another section in Article 250 allows it.

Many line side connections, such as this PV system, terminate in an enclosure that is not considered a service disconnect.

NEC 250.28(A) permits aluminum and copper-clad aluminum main bonding jumpers which aligns with Table 250.102(C)(1).

Multiple generators of the same type connected in parallel.

According to 250.53(A)(3), if multiple rod, pipe, or plate electrodes are installed to meet the requirements of 250.53(A)(2), they must be at least 6 feet apart.

Pool rebar is not to be used as the grounding electrode system for the electric service.

Relying on the rebar to interconnect the water pipe to the service as in the image is a code violation.

What type of PVC should be used to protect these grounding electrode conductors? Schedule 40 or schedule 80?

Common hot gutter type service installation with the grounding electrode conductors connected to the exposed copper grounding busbar.

Cable armor is similar to armored cable type AC, but there is little space between the armor and the conductor inside.