Okay, I have a main panel that is a 1978 2-wire system with combined neutral/ground bar and a 100amp main disconnect breaker. I'm Replacing it with new 200-amp service and all load wiring has been updated and includes ground wiring. The easiest transformation is to add a room and convert the exterior wall where the old panel is to an interior wall and simply put the new panel facing the new room to meet code and avoid a j-box. The old panel is also in a kitchen cabinet. The meter box is on the exterior opposite the original panel box but is being relocated to a new ext. location.
I installed a temporary power pole main disconnect with 2-2-2-4 SER to run 25' in schedule 40 from the disconnect to the old panel until the room is built. To convert it to a subpanel, do I remove one of the existing ground/neutral bars and replace it with an insulated neutral bar and put all load neutrals on the insulated bar plus the #2 neutral wire from the disconnect and all grounds to the ground bar? I'm assuming the 2-2-2-4 SER Al is rated to enter the house to the panel.
Other than the #4 ground wire from the new disconnect to the old panel, does the subpanel also need a #6 bare copper ground from the ground bar to a copper ground rod? I already have 2 ground rods at the main disconnect on the temp pole.
Lastly, there is already a 4-wire subpanel that I had previously wired from the original panel to a workshop and put a ground to a copper rod at that subpanel. If I have my wiring description above correct, is any of this going to affect the wiring arrangement at the existing subpanel of the workshop?
Thanks for any advice/recommendations.