Hello fellow Contractors HVAC guy here just paid someone to put a new panel in my house and the grounds and the neutrals are connected to the panel itself does that mean all 120 volt neutral power is going through the grounding Bolt is this considered an industry standard I've never seen this before I don't believe. And let me clarify when I say the panel I mean the physical 200 amp Square Box panel they are zip screwed pretty much to the back of the panel for some reason it will not let me upload pictures to show you however there are lugs with an allen key screw holding them in place at the ends of the wire but the physical square box of the panel is now the conduit back to the neutral and ground