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The Fundamental Phasor Readings Table in SMS displays incorrect values for a 3-Phase High-Leg Delta system, also referred to as: Red-leg, Stinger-leg, Center-Tap grounded, or Wild Leg. For a normal (3-wire) delta only L-L readings are available, however, a center tapped grounded connection delta system is considered to be a 4-wire system type (40 or 41 depending upon installation) and is treated as such by the meter. As such it is expected that the L-L voltage phases will have a 120 degree separation.
For a 3-phase 4-wire system (monitored by a PM800, CM3000, or CM4000), the fundamental phasor readings table will display L-N Voltages and not the L-L Voltages (Note, the neutral as shown is actually the ground). The A-N Voltage will have 180 degrees of separation from the C-N Voltage (assuming that B is the High Leg). Additionally, the B-N voltage (the high-leg) will have 90 degrees of separation for the other two L-N readings. See Figure 1 below for a typical example.