Installing transformer & panel

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I have been ask to install a 240v 3 phase panel. I have a 3 wire 208v 3 phase buss, no neutral or ground other than the frame. I installed a buss plug have the conduit ran to the transformer, also from the transformer to the new panel. Ready to wire. I plan on connecting the 208v feed to the secondary side of the transformer in order to get the 240v. I know I need to connect the 208v wires to X1,X2 & X3. I don't belive I should connect anything to X0. Should I connect a wire between the buss plug and the frame of the transformer? Also from the transformer to the 240v panel, where do I get my ground? ( From the frame of the transformer?) Also shoud I corner ground the 240v? If so how?

Any help appreciated!!
 
derelectric said:
I plan on connecting the 208v feed to the secondary side of the transformer in order to get the 240v. I know I need to connect the 208v wires to X1,X2 & X3.
!!
What xfrmr gives you 208/240.Is this a buck boost transformer?
Rick
 
Are you sure you need the transformer and 240 volts? A lot of equipment can handle 208 or 240 with no modification, and a buck-boost array may be enough for the equipment that must have 240v.
 
Guys,
The transformer we are using is a 240v delta/208/120 wye. Were backfeediing it. I tried to convince the department to purchase equipment to run off the existing 208v electrical service. They are adimate that they have to have 240v. They tried to hook it up to 208v, didn't work. Auto transformers would have been the easiest. However we had the above transformer in house. They had ran out of money.
I don't belive I should connect anything to X0. Should I connect a wire between the buss plug and the frame of the transformer? Also from the frame of the transformer to the 240v panel. Also shoud I corner ground or stinger ground the 240v Delta even if I don't need a neutral. My guess is the phase voltages will not float. If I did ground it does it go to the chassis ground or to the building or both?
 
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