WND-WR-MB-Inst-1.03
Page 5 of 16
2.2.2 Single-Phase, Two-Wire, Line-to-Line
This circuit occurs in residential (commonly 120/240 Vac) and some commercial applications (such
as 208 or 480 Vac line-to-line). The meter will be powered from the
V
A
and
V
B
input terminals. Two
CTs are typically used as shown below.
V
B
V
C
V
N
V
A
W
ATT
N
ODE
®
CT2 CT1
CT3
L2
L1
Earth
Figure 3: Single-Phase, Two-Wire, Line-to-Line with Two CTs
documents two advanced configurations:
●
By setting
ConnectionType = 5
, only one CT is required instead of two.
●
One WattNode can monitor three single-phase, two-wire, line-to-line circuits.
2.2.3 Single-Phase, Three-Wire (Split-Phase)
This is a common North American residential service at 120/240 Vac with a neutral connection. The
CTs should be placed around the L1 and L2 line conductors and connected to the
CT1
and
CT2
terminals respectively. The meter will be powered from the
V
N
,
V
A
, and
V
B
terminals.
V
B
V
C
V
N
V
A
W
ATT
N
ODE
®
CT2 CT1
CT3
L2
L1
Neutral
Earth
Figure 4: Single-Phase, Three-Wire
2.2.4 Three-Phase, Three-Wire Delta
This service is common in commercial and industrial settings. It does not include a neutral conduc-
tor. In some cases, the service may be four-wire wye while the load is three wire delta (no neutral).
The meter will be powered from the
V
A
and
V
B
terminals.
With the default configuration, three CTs are required as shown below.
By setting
ConnectionType = 2
, only two CTs are required. See the
V
B
V
C
V
N
V
A
W
ATT
N
ODE
®
CT2 CT1
CT3
L3
L2
L1
Earth
Figure 5: Three-Phase, Three-Wire Delta with Three CTs
