It would be a line to line fault in theory. Any fault on the other 2 non grounded phases would do that. Another possibility is running the system ungrounded and using a ground detector to detect faults but unless service continuity is a requirement you don't have too.Awesome thanks for the picture. It is only one 480 load so the corner ground sounds like my route. By grounding one phase does that just direct fault current from the other phases to ground? With the corner grounded would it be a line to line fault in away if one of the others phases was to contact bare metal?
This drawing is WRONG completly different transformer shown.
My concern is also the magnetizing inrush. I am not an expert on dry transformers but I do know that when reverse fed the magnetizing inrush might be greater than normal since engineering specs aren't around back feeding. You can certainly try though.Thanks for all the info so far guys the plan is to use this for a motor load is that a bad idea using this in reverse with a motor? I read that the input current can be 8 to 9 times the rated amps for a very short period of time would that be happening everytime the motor is started?
The biggest issue I've seen is when you initially energize the transformer, the inrush current is much higher than on a traditionally connected one. You'll need to make sure the inrush current rating is high enough if you feed it with a breaker. If it's fused, it will probably be okay. The biggest issue is that these transformers are readily available and reasonably priced. A transformer designed for 208 - 480 is very spendy.Thanks for all the info so far guys the plan is to use this for a motor load is that a bad idea using this in reverse with a motor? I read that the input current can be 8 to 9 times the rated amps for a very short period of time would that be happening everytime the motor is started?
It is not a neutral it is a grounded conductor big difference in this application.Sometimes I will get a 6 hole terminal bar and drill and tap 2 1/4-20 holes in the bottom between the wire holes. Drill matching holes in the bottom of the transformer housing. Route your incoming ground, outgoing ground, building steel, neutral bond (H2 in this case) wires to this terminal strip.