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I see, thank you for clarifying this.
what you describe is 3 phase transmission system and doesnt have any load directly connected to it. If we are measuring load as in the project we would be utilising a 3 phase 4 wire system. the 4th wire is the return path for the 3 phases. here is a link the explains it much better than I can.https://www.quora.com/What-is-the-significance-of-the-neutral-line-in-3-phase-electricity-distribution-What-happens-if-the-neutral-line-doesnt-exist
Simple 3 Phase Arduino Energy Meter
Since the neutral is return path for each phase and is current carrying, couldn't you simplify this and combine all 3 phases by measuring just the neutral leg?
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