Figure 1: Terminology Illustration
Three-phase grid configuration types:
Wye: In a Wye ("Y") configuration, all three phases are
connected at a single neutral point. Wye systems utilize
five wires - three hot, one neutral and one ground.
Delta: In a Delta configuration, the three phases are
connected in a triangle. Delta systems utilize four wires -
three hot and one ground.
Revenue Grade Energy Meter with Modbus Connection Installation Guide MAN-01-00609-1.0
Chapter 1: Introduction
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