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

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10 Installation
Single-Phase Three-Wire (Mid-Point Neutral)
This configuration is seen in North American residential and commercial service with 240 Vac for
large appliances. The three conductors are a mid-point neutral and two line voltage wires with AC
waveforms 180° out of phase; this results in 120 Vac between either line conductors (phase) and
neutral, and 240 Vac between the two line conductors (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
Phase A
Neutral
Phase B
WHITE
BLACK
120 Vac
240 Vac
120 Vac
S
O
U
RC
E
LO
A
D
Shorting
Jumper
Source
Faces
Current
Transformers
3Y - 208
3D - 240
Figure 3: Single-Phase Three-Wire Connection
Recommended WattNode Models
The following table shows the WattNode models that can be used. If neutral may or may not be
present, you should use the WNB-3D-240-P (see
Single-Phase Two-Wire without Neutral
below). If phase B may not be present, you should use the WNB-3Y-208-P (see Single-Phase
Two-Wire with Neutral above).
Meter Power Source WattNode Model
N
and
Ø A
(Neutral and Phase A) WNB-3Y-208-P
Ø
A
and
Ø
B
(Phase A and Phase B) WNB-3D-240-P