250.20(B)(2)

[m sleem]

Where is the service panel's grounding bar in first exhibition? compared to second one where both are 3-phase, 4-wire, wye connected system.

 

[LarryFine]

They're each in the service disconnect. The second example has separate neutral and grounding bars with a bonding jumper between them, while there is only one bar in the first example.

What's different to you that prompts you to ask the question?