Please check me on this. There has been a lot of discussion on this topic and it gets confusing and I tend to second guess myself. I have a 3 wire w/EGC 480V feed to an unattached building. 3 3/0 hots and a #1 EGC. They terminate in a 480V 200A MB panel which has a #4 GEC connected to a 5/8" x 8' electrode. This panel has a 3 pole 100A CB that feeds a 45kva 480V primary/ 208/120V secondary. From the 480V panel I have 3 #2 cu thhn and 1 #4 EGC going to the tranny and terminated on H1, H2, and H3. The EGC lands in a lug bolted to the tranny frame. From the tranny I have 4 3/0 thhn conductors and 1 #1 ECG. The 3/0 are terminated on X1, X2, X3 and XO. XO being the neutral running to the 208/120V 200A MB panel. The EGC runs from the same EGC lug in the tranny to the EGC bar in the 208/120 panel and is bonded to the neutral bar in the 208/120 panel. Is this correct?