I was reading a thread earlier about bonding XO in a transformer, and I asked a question about it. Not sure if I misspoke or stepped on toes, so I am going to try again. I have had some old timers show me how to wire up a transformer in the past. They always had a single primary and secondary feed. They would take the grounded conductor emerging from the secondary feed conduit and run it unbroken thru XO and then to a lug that grounded the case of the XFMR by stripping enough insulation to allow the wire to be tightened down bare in the XO lug, and leaving the remainder insulation intact until it landed on the grounding lug. There were additional XFMR case grounding lugs for the pri and sec and building steel GECs. Has anyone else seen this done? Is this an old style of wiring, completely incorrect, or what?