Don,
I'm sure there isn't one. In my case, I'm not an employee so OSHA doesn't apply to me. If the PoCo would let me do hook-ups, I would. I know rules are important, but I don't see where it makes a difference what your "title" is. I don't see why we have rules that say if you are a "lineman" you can, if you're an "electrician" you can't. The rules of physics apply equally to everyone.
I'd say that thanks to this forum, I'm in much less danger than a lineman doing the same job. I've seen lineman pull meters bare-handed with a cotton t-shirt. I've seen them pull a loose 4/0 service entrance conductor right out of a residential panel bare-handed. In fact (and let the flaming begin), that electricians may be the safer of the bunch. The lineman I've encountered are so used to working with really high voltages, that they usually treat 120V like we electricians treat phone wires. "Might give me a jolt, but nothing to worry about." When I work things hot, I at least wear the proper PPE.
Just one man's experience/opinion.
Mark