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What makes you think "600V" is Delta? In most of Canada, the 600V distribution is 600Y347V.

A 3 phase motor does not use the neutral for anything, so you never give the motor more than the 3 phases, regardless of whether it is derived from a Delta or Wye service.

Inside of the motor, the windings might be Delta or Wye for various reasons, but still, that has no bearing on how you connect it to the line source, it's still just 3 phases.
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