Install Manual

5
Table 1 above lists the WattNode models and common circuit types. In the “Electrical Service
Types” column, when two voltages are listed with a slash between them, they indicate the line-to-
neutral / line-to-line voltages. The “Line-to-Neutral” and “Line-to-Line” columns show the operating
ranges for the WattNode meters.
Connect the line voltages to the meter inputs as shown in the following figures for each service
type. See Figure 1 above for an overview.
2.2.1 Single-Phase Two-Wire with Neutral
This is a common residential and branch circuit connection. Up to three such circuits may be moni-
tored with one meter by also using the ØB and ØC inputs.
Ground
ØB
ØC
N
ØA
W
ATT
N
ODE
®
Neutral
Line
2.2.2 Single-Phase Two-Wire No Neutral
This circuit occurs in residential (commonly 120/240 Vac) and some commercial applications.
The meter is powered from the ØA and ØB terminals. We recommend connecting the N terminal
to ground to provide a clean voltage reference for the measurement circuitry (no current will flow
through this terminal).
Ground
ØB
ØC
N
ØA
W
ATT
N
ODE
®
L1
L2
2.2.3 Single-Phase Three-Wire with Neutral
This is a common residential service at 120/240 Vac.
Ground
ØB
ØC
N
ØA
W
ATT
N
ODE
®
Neutral
L1
L2
2.2.4 Three-Phase Three-Wire Delta No Neutral
This is common in commercial and industrial settings. In some cases, the service may be four-
wire, wye but the load may only be three wire (no neutral).
Occasionally, a load will only be connected to two of the three lines (say L1 and L2). For this case,
connect the two active lines to the ØA and ØB terminals and connect two CTs for the two lines.