WND-WR-MB-Inst-1.03
Page 7 of 16
3.2 Mounting
●
Protect the meter from temperatures below -40°C (-40°F) or above 80°C (176°F), excessive
moisture, dust, salt spray, or other contamination, using a NEMA rated enclosure if necessary.
The meter requires an environment no worse than pollution degree 2 (normally only non-con-
ductive pollution; occasionally, a temporary conductivity caused by condensation).
●
The meter must be installed in an electrical service panel or an enclosure.
●
Do not
use the meter as a drilling guide; the drill chuck can damage the screw terminals and
metal shavings may fall into the connectors.
The meter has two mounting holes spaced 5.375 in. (137 mm) apart (center-to-center). These
mounting holes are normally obscured by the detachable screw terminals. Remove the screw termi-
nals to mark the hole positions and mount the meter.
Self-tapping #8 sheet metal screws are included. Do not over-tighten the screws, as long-term stress
on the case can cause cracking.
3.3 Connect Voltage Terminals
3.3.1 Circuit Protection
The WattNode meter is considered “permanently connected equipment” and requires a disconnect
means (circuit breaker or disconnect switch) and overcurrent protection (fuse or circuit breaker).
The meter draws less than 0.1 amp, so the rating of any disconnects, fuses, and/or circuit breakers
is determined by the wire gauge, the mains voltage, and the current interrupting rating required.
●
The disconnect or circuit breaker must be clearly marked, suitably located, and easily reached.
●
Use circuit breakers or fuses rated for 20 amps or less, and rated for the service voltage.
●
Use ganged circuit breakers when monitoring more than one line voltage.
●
The circuit breakers or fuses must protect whichever of the mains terminals
V
A
,
V
B
, or
V
C
are
connected to the mains. Neutral does not need overcurrent protection.
●
The circuit protection / disconnect system must meet IEC 60947-1 and IEC 60947-3, as well as
all national and local electrical codes.
3.3.2 Line Wiring
●
Always turn off power
before connecting the line voltages to the meter.
●
For the line voltage wires, CCS recommends 18 to 12 AWG stranded wire, type THHN, MTW, or
THWN, 600 V.
●
Use copper conductors only. The screw terminals are only rated for copper wire.
●
Do not place more than one wire in a screw terminal; use wire nuts or terminal blocks if needed.
●
Verify that the highest line-to-neutral or line-to-line voltage is nominally between 100 and 600
Vac. The absolute maximum operating voltage is 690 Vac.
Connect each service conductor to the green terminal block as shown in section
above. Torque the
screws to 3.5 lbf·in (0.4 N·m).
The screw terminals handle wire up to 12 AWG. Connect each voltage line to the green terminal
block as shown in
Figure 1
above. After connecting the voltage wires, make sure
both terminal blocks are fully seated in the meter.
3.3.3 Grounding
The WattNode uses a plastic enclosure, insulation, and internal isolation barriers instead of pro-
tective earthing. The ground terminal on the green screw terminal block is a functional ground,
designed to improve the measurement accuracy and noise immunity. If necessary, this terminal may
be left disconnected.
3.4 Connect Current Transformers
To meet the UL listing requirements, the meter must be used with UL Listed or UL Recognized cur-
rent transformers. Only UL Listed CTs are approved for use in retrofit applications in panelboards;
recognized CTs must not be used for this application.
