I have 2 "new" CW80 transformers. Can I assume they would be in phase so all I need to do is connect the "common ground" to both?
They will both be plugged into the same power strip which is plugged into the wall outlet.
Thanks for any feedback
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No, you can't assume that they will be in phase if you randomly power them from a strip, even though they are equipped with polarized plugs.
Instead of guessing, use the standard method to put them in phase, and then mark their plugs accordingly. Insert the plugs into the strip the same way every time.
Since the plugs are polarized, they will be going in the same way every time. 
Yes, and that in no way ensures that they are in phase, until they are tested.
Can't argue that point, just pointing out that the plugging direction is not optional without a file. 
You have new in quotes so I don't know if you mean new or just new to you. If they are just new to you, i recall there was an issue with the early ones that had the common mismarked. Anyway, you will know pretty quick.
https://www.youtube.com/watch?v=iASQfnE6pCk
Brendan
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