Installation 15
The WattNode meter will correctly measure services with a grounded leg, but the measured volt-
age and power for the grounded phase will be zero and the status LED will not light for whichever
phase is grounded, because the voltage is near zero. Also, one or both of the active (non-
grounded) phases may indicate low power factor because this type of service results in unusual
power factors.
For optimum accuracy with a grounded leg, you should also connect the
N
(neutral) terminal
on the meter to the ground terminal; this will not cause any ground current to flow because the
neutral terminal is not used to power the meter. If you have a grounded leg configuration, you can
save money by removing the CT for the grounded phase, since all the power will be measured on
the non-grounded phases. We recommend putting the grounded leg on the
Ø
B
or
Ø
C
inputs and
attaching a note to the meter indicating this configuration for future reference.
Mounting
Protect the WattNode meter from moisture, direct sunlight, high temperatures, and conductive
pollution (salt spray, metal dust, etc.) If moisture or conductive pollution may be present, use an
IP 66 or NEMA 4 rated enclosure to protect the meter. Due to its exposed screw terminals, the
meter must be installed in an electrical service panel, an enclosure, or an electrical room. The
meter may be installed in any orientation, directly to a wall of an electrical panel or junction box.
153 mm (6.02 in)
38 mm (1.50 in) High
Ø
9.8 mm (0.386 in)
Ø
5.1 mm (0.200 in)
85
.1 m
m (
3.3
5 i
n)
136.6 mm (5.375 in)
Figure 7: WattNode Meter Dimensions
The WattNode meter has two mounting holes spaced 5.375 inches (137 mm) apart (center to
center). These mounting holes are normally obscured by the detachable screw terminals. Remove
the screw terminals by pulling outward while rocking from end to end. The meter or
may be used as a template to mark mounting hole positions, but
do not drill the holes with the
meter in the mounting position
because the drill may damage the connectors and leave drill
shavings in the connectors.
You may mount the meter with the supplied #8 self-tapping sheet metal screws using 1/8
inch pilot hole (3.2 mm). Or you may use hook-and-loop fasteners. If you use screws, avoid
