Ed is correct. I would just add on thing. Have a look at 250.30 (A)(1) in the 2002 code. It states that "...it shall be made at the source of a seperately derived system that has no disconnecting means or overcurrent devices." If you are feeding a panel that doesn't have a disconnecting means, you must leave the "strap" (bonding jumper) in it that comes from the factory, or put one in it if it doesn't have one. I've never seen a wye type transformer that didn't come with a factory bonding jumper. If your panel has a disconnecting means, and you want to bond the neutral at the panel, it is perfectly legal, but most installations that I've seen, and done, have the bond on the secondary side of the transformer. My reasoning, you may ask? I figured, why should I remove, and replace something that the "factory" has done for me. I couldn't tell you if there are any advantages or not. I will say this, "If you have a factory installed bonding jumper that aint broke, then don't fix it."
I've been truely transformed,
The Watt Doctor