This weekend I attempted to install a breaker box into a pre-wired garage. The previous owners took the breaker box with them when they moved, and since I have installed quite a few subpanels, it seemed like an easy job to replace it.
The subpanels I have installed have always used 4-wire connections, so I was surprised to find that only three wires had been run underground through the conduit, and the ground was attached to a separate rod at the garage.
Reading up on the permits for the house and some NEC info lead me to believe that this was a pre-2005 installation, at which point 3-wire was still allowed to connect a sub to a main in a detached structure.
My question is this:
What is the correct setup for neutral and ground in the sub panel? Should they be bonded, and do I need to attach a ground to the buried rod at the garage as well?
Specifically, I need to know if this image shows a correct setup before I proceed. This question has been touched upon in other posts, but not adequately answered: