Boost Transformer 208 to 480 Grounding not bonding

[Fordean]

Boosting 208 to 480 for machine testing. Don't need a neutral. Transformer is 150 feet from Service. Per previous discussion, We agreed not to bond Xo to ground. Since it is not being used in this case. Question is, Do I need to still run ground wiring to nearest steel, Or is the existing ground path thru conduit (has ground conductor in pipe) sufficient, Or since I am not using Xo, There is no need to bond to steel
Code number would work for me, Looking as we speak.

 

[infinity]

Is the 480 a Wye configuration?

 

[ptonsparky]

You need an EG of some sort.
Wye or Delta configured secondary makes a difference of what you do.

 

[Fordean]

Its 208 wye to 480 Delta

 

[infinity]

Its 208 wye to 480 Delta

So there is no X0 on the secondary side. Your choices are corner ground on the 480 side or ungrounded with a ground detector. Since this is being used for testing I would think that you would want to use a grounded system. IMO this is not the best transformer for your application, I would use a Delta/Wye.