7
3 Installation
3.1 Installation Checklist
See the sections referenced below for installation details.
□
Turn off power
before making line voltage connections.
□
Mount the WattNode meter (see
□
Connect circuit breakers or fuses and disconnects (see
).
□
Connect the line voltage wires to the meter’s green terminal block (see
□
Mount the CTs around the line conductors. Make sure the CTs face the
source
(see
□
Connect the twisted white and black wires from the CTs to the black terminal block on the
meter, matching the wire colors to the white and black dots on the meter label (see
).
□
Check that the CT phases match the line voltage phases (see
□
Record the CT rated current for each meter, because it will be required during commission-
ing.
□
Connect the output terminals of the WattNode meter to the monitoring equipment (see
□
Check that all the wires are securely installed in the terminal blocks by tugging on each wire.
□
Turn on power to the meter.
□
Verify that the LEDs indicate correct operation (see
,
3.2 Mounting
●
Protect the meter from temperatures below –40°C (–40°F) or above 75°C (167°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
terminals to mark the hole positions and mount the meter.
Self-tapping #8 sheet metal screws are included. Don’t 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, switch, or disconnect) and overcurrent protection (fuse or circuit breaker).
The meter only draws 10-30 milliamps, so the rating of any disconnect switch, 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.
●
Use ganged circuit breakers when monitoring more than one line voltage.
●
The circuit breakers or fuses must protect the mains terminals labeled
Ø
A
,
Ø
B
, and
Ø
C
. In the
rare cases where neutral has overcurrent protection, then the overcurrent protection device
must interrupt both neutral and the ungrounded conductors simultaneously.
●
The circuit protection / disconnect system must meet IEC 60947-1 and IEC 60947-3, as well as
all national and local electrical codes.
