Ed, thank you, those are the exact protectors I intend to use.
I guess I won't need any other intermediate connecting blocks, if I can terminate the DB cables on those protectors.
Fiber is great, but not a choice in this application. It would be overkill and add unnecessary expense. I have two empty 3" metallic conduits in place between the buildings, so pulling whatever I need is easy, and they will have grounding protection.
Thank you all for your advice.
