Most of these post are referring to Older transformers that did not have polarized plugs that would allow the transformers to have the plugs inserted into a 120v outlet either upside down or rightside up. Which allowed the various transformers to be out of phase. Not having a Powerhouse in front of me, I believe those items do have polarized plugs (one blade on the plug wider than the other) that prevents the Powerhouses from being out of phase from one another. But please check the plugs to see if they are in fact Polarized. And again, I did not see any reference to using older transformers in your original post. Again if you are using older transformers with your Powerhouses they would need to make sure that the transformers are phased to the Powerhouses.
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