I guess I’m confused about when bonding is required in the service panel and down stream sub-panel. I’ve seen the green screws and bonding straps (copper bars or aluminum bar) this is bonding? So this panel would be a sub-panel, because the main service disconnect is located outside at the meter base. So Sub-panels downstream do not have to be bonded??
I don’t know what you are asking but this statement as I understood it didn’t make sense. If the main disconnect is outside, the panel in the utility room is a sub panel.
Correct, so sub-panels are not required to be bonded?
Bonded to what?
In the sub panel the grounding conductors need to be bonded to the panel.
The grounded conductors (neutrals) need to be isolated from the panel and the groundin conductors.
Bonded to each other, So what does a green screw in service panel do and what does a bonding strap do. Does the screw bond the neutrals to metal panel or does the strap ?
They both do.
The grounding conductor is Always bonded to the electrical grounding system throughout. As Juan said the grounded conductors (neutrals) are only bonded to the grounding system at the service disconnect, from every point forward the neutrals must remain isolated from the grounding conductor.
A little terminology, you’re referring to the main bonding jumper (MBJ). The MBJ can be a screw, strap, piece of bus bar, a wire type conductor etc. It’s function is to connect the neutral conductor to the metal enclosure at the service disconnect.
If that panel is a sub panel it is required to have the neutral isolated from the ground bar. From the looks of it is a sub panel with grounds to the left, neutrals to the right and a 4 wire feed.
The metal bar the connects the two together is removed which is correct, they must be separate, however from the looks of it the ground bar is floating. The ground bar should be bonded to the can. In addition to that it looks like the neutral might be bonded to the can instead. Older GE panels will usually have a screw below the right neutral/ground lug. In this case it appears to be in place (silver white screw) bonding the neutral to the case which is not correct. The ground on the left should be bonded to the case but its not. Guess someone mixed the two up.
Hope I answered you question 
Yes this is a sub-panel. The green conductor in the PVC feeder would be indicative of this being setup as a sub-panel. Also what is the large bare conductor’s function? If it’s a GEC it must be moved to the service disconnect.
First point of disconnect.
