Installation
13
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.
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
WNC-3Y-208-BN
230 Vac
400 Vac
WNC-3Y-400-BN
277 Vac
480 Vac
WNC-3Y-480-BN
347 Vac
600 Vac
WNC-3Y-600-BN
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
WNC-3D-240-BN
230 Vac
400 Vac
WNC-3D-400-BN
277 Vac
480 Vac
WNC-3D-480-BN
Ground
W
HI
TE
B
LAC
K
Ø
B CT
Ø
C CT
Ø
A CT
Ø
B
Ø
C
N
Ø
A
Common
B+, D1, RxD+/TxD+
EI
A-
48
5
PC or BACnet Host
A−, D0, RxD−/TxD−
Continental Control Systems LLC
Status
Status
Status
X
C
B+
A-
M
S/
TP
Com
WNC
-
WNC
-
W
ATT
N
ODE
®
BAC
NET
-
BN
-
BN
Neutral
Phase A
Phase B
Phase C
LO
AD
WHITE
BLACK
W
HI
TE
B
LAC
K
LI
N
E
Source
Faces
Current
Transformers
3Y
-
xxx
3D
-
xxx