Yes, the wiring from the two panels to the garage may be in a common raceway. How can you comply with 225.30 if you have circuits from two services supplying a single garage?
Don
Dave,
It is a single building, and the code only permits it to be served by one feeder or branch circuit. It doesn't seem to meet any of the special conditions in 225.30. I know that this is a common practice, but it appears to be a code violation.
Don