SATEC EM132-133 Manual - Manual (Page 28)

‎Chapter 2 Installation
28 EM13x Series SMART MULTIFUNCTION METER
Figure ‎2-16 3-Wire 2-Element Open Delta Connection Using 2 PTs, 2 CTs (Wiring Mode = 3OP2)
This configuration provides accurate power measurements only if the voltages are balanced.
Figure ‎2-17 4-Wire Wye 2½-Element Connection Using 2 PTs, 3 CTs (Wiring Mode = 3LL3 or 3Ln3)