Strictly from my amateur point of view, if the panel is labeled as 3phase 208/120v, wouldn't you be required to feed it as such, even if the planned loads are only going to be 208v?
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My opinion might change is the distance is long.
Mine doesn't. But then again, I don't share neutrals either.
edited to change "connect" to "feed".
[This message has been edited by mxslick (edited 11-11-2006).]