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This video covers proper phasing of the Envoy S metered "A" power terminal in conjunction with the "IA dot" and "IA" consumption CT terminals inside the Envoy.
The Envoy, "A" power terminal, and envoy "IA dot" and "IA" consumption CT terminals must be on the same phase inside the service panel the Envoy draws powers from.
If you install the consumption current transformer (CT) on the wrong phase you will still get readings, but they will not be accurate as stated by Enphase.
I did not cover the production transformer here, only the consumption.
Hope it helps