In general, what you'll end up with will look something like this:
The concrete base will be 5 ft deep and 16" diameter. You will likely have someone make up s rebar "chair" .. a 12" square rebar framework that runs the length of the pour. Your post bolts will be attached to this with tie wire.
You'll make a plywood template of the post base, to align the bolts, and hold them in place while the concrete sets. The bolts will likely be 1" diameter.
In the pour will also bee a PVC raceway for the wires.
The post will be at least 4" square tube, with a handhole for making your connections at the base. A 6" tube is better, if for nothing else but room for your hands to work the wires.
