6
Overview
Three-Phase Four-Wire Wye
This is typically seen in commercial and industrial environments. The wires are neutral and three power
lines with AC waveforms shifted 120° between the successive phases. With this configuration, the line
voltage wires may be connected to the phase A, B and C terminals in any order,
so long as the CTs are
connected to matching phases
. It is important, however, that you connect the neutral line correctly.
Three-phase four-wire wye circuits should be measured with the WNA-3Y-208-P (208 VAC phase to
phase and 120 VAC phase to neutral), the WNA-3Y-400-P (400 VAC phase to phase and 230 VAC phase
to neutral), the WNA-3Y-480-P (480 VAC phase to phase and 277 VAC phase to neutral), or the
WNA-3Y-600-P (600 VAC phase to phase and 347 VAC phase to neutral), depending on the line voltage.
Neutral
Phase A
LINE
Phase B
Phase C
LOAD
Current
Transformers
WHITE
BLACK
Source
Faces
WHITE
BLACK
WHITE
BLACK
Neutral
Output
WNA-3Y-xxx-P
Continental Control Systems
W
ATT
N
ODE
C CT
B CT
A CT
C VAC
B VAC
A VAC
Figure 3: Three-Phase Four-Wire Wye Connection
