12 Installation
Three-Phase Four-Wire Wye
This is typically seen in commercial and industrial environments. The conductors are neutral
and three power lines with AC waveforms shifted 120° between phases. The line voltage con-
ductors may be connected to the
Ø
A
,
Ø
B
,
and
Ø
C
terminals in any order,
so long as the CTs
are connected to matching phases
. It is important that you connect
N
(neutral) for accurate
measurements.
Ground
W
H
IT
E
B
L
AC
K
Ø
B CT
Ø
C CT
Ø
A CT
Ø
B
Ø
C
N
Ø
A
Common
Input or Positive
Monitoring Equip-
ment or Display
P1
P2
P3
COM
O
u
tp
u
t
Status
Status
Status
W
ATT
N
ODE
®
P
ULSE
WNB
-
WNB
-
-
P
-
P
Neutral
Phase A
Phase B
Phase C
LO
A
D
WHITE
BLACK
W
H
IT
E
B
L
AC
K
S
O
U
RC
E
Source
Faces
Current
Transformers
3Y
-
xxx
3D
-
xxx
Figure 5: Three-Phase Four-Wire Wye Connection
Recommended WattNode Models
The following table shows the WattNode models that should be used, depending on the line-to-
neutral voltage and line-to-line voltage (also called phase-to-phase voltage). For these models, the
meter is powered from the
N
and
Ø
A
terminals.
Line-to-Neutral Voltage
Line-to-Line Voltage
WattNode Model
120 Vac
208 Vac
WNB-3Y-208-P
230 Vac
400 Vac
WNB-3Y-400-P
277 Vac
480 Vac
WNB-3Y-480-P
347 Vac
600 Vac
WNB-3Y-600-P
You may also use the following delta models to measure three-phase four-wire wye circuits. The
only difference is that delta WattNode models are powered from the
Ø
A
and
Ø
B
terminals.
Line-to-Neutral Voltage
Line-to-Line Voltage
WattNode Model
120 - 140 Vac
208 - 240 Vac
WNB-3D-240-P
230 Vac
400 Vac
WNB-3D-400-P
277 Vac
480 Vac
WNB-3D-480-P
