CCS WattNode Pulse WNB-3D-240-P, Справочное руководство

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Installation 11
Single-Phase Two-Wire without Neutral
This is seen in residential and commercial service with 208 to 240 Vac for large appliances. The
two conductors have AC waveforms 120° or 180° out of phase. Neutral is not used. For this
configuration, the meter is powered from the
Ø A
and
Ø B
(phase A and phase B) terminals.
For best accuracy, we recommend connecting the
N
(neutral) terminal to the ground terminal.
This will not cause ground current to flow because the neutral terminal does not power the meter.
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
Phase A
Phase B
WHITE
BLACK
208-240 Vac
S
O
U
RC
E
LO
A
D
Shorting
Jumper
Source
Faces
Current
Transformers
3D - 240
Figure 4: Single-Phase Two-Wire without Neutral Connection
Recommended WattNode Model
This configuration is normally measured with the following WattNode model.
Line-to-Line Voltage WattNode Model
208 - 240 Vac WNB-3D-240-P
If neutral is available, you may also use the WNB-3Y-208-P model. If you use the WNB-3Y-208-P,
you will need to hook up the meter as shown in section
Single-Phase Three-Wire (Mid-Point
Neutral) and connect neutral. You will need two CTs.
If one of the conductors (phase A or phase B) is grounded, see Grounded Leg Service below for
recommendations.