A ) Consumption CTs are installed in the system breaker panel, and their wires
are routed into the NPR through wiring conduit. Refer to the diagram below.
Make sure that the AC mains wire(s) are de-energized until you have secured
the CT wires in the terminal blocks.
B ) Before running the CT wires through conduit, use colored tape to mark each
of the CTs and the free ends of its wires, marking each with a different color.
You can run multiple CT wires through a single conduit.
C ) Before installing the
consumption
CTs on active phases as required, locate
the arrow on the CT label.
D )
To monitor consumption on Line 1
:
- Connect the white wire to the white “C1” and the blue wire to the blue “C1”
terminal.
- Clamp the CT on the main supply Line 1. When the consumption CT is on
Line 1 conductor, the arrow must point toward the load (away from the grid).
E )
To monitor consumption on Line 2
:
- Connect the white wire to the white “C2” terminal and the blue wire to the
blue “C2” terminal.
- Clamp the CT on the main supply Line 2. When the consumption CT is on Line 2 conductor, the arrow must point toward the load (away from the grid).
F )
To monitor consumption on Line 3
:
-
Connect the white wire to the white “C3” terminal and the blue wire to the blue “C3” terminal.
-
Clamp the CT on the main supply Line 3. When the consumption CT is on Line 3 conductor, the arrow must point toward the load (away from the grid).
G )
Tighten all connections to 5 in-lbs (0.6 N m).
Install CTs for Consumption Metering (optional)
The IQ Envoy inside the Three Phase NPR is pre-wired at the terminal blocks for power and production metering connections. Three solid-core production current
transformers (CTs) are pre-installed for revenue grade production metering. Consumption metering is supported, but consumption CTs are not included with the
NPR. If consumption metering is desired, you can order and install three optional split-core CTs to provide consumption metering. Use a protected route in conduit
for the CT wires from the system breaker panel to the IQ Commercial Envoy. The consumption CT leads are 13 feet long. If you need to extend the leads, refer to the
Enphase IQ Commercial Envoy Installation and Operation Manual
Do not extend the leads of the production CTs.
NOTES
:
When installing CTs, it is important to match CT and sense
voltage phases. Be sure to consistently identify the three AC lines
at three points: the main load center feed, the Envoy, and the solar
production circuit breaker. Wire colors (typically black, red, and blue)
may not always consistently identify L1, L2, and L3. If in doubt, use a
multimeter to check.
5
NOTE
:
Because of variance in load center design and main power feed, there may not always be enough space to install consumption metering CTs.
DANGER!
Risk of electrocution! Do not install CTs when cur-
rent is flowing in the sensed circuit. Always install CT wires
in the terminal blocks before energizing the sensed circuit.
DANGER!
Risk of electric shock. Always de-energize the load
center before beginning wiring.
Energize and Update the IQ Envoy
A ) Turn on the circuit feeding the NPR.
B ) On the IQ Envoy (inside the NPR), if AP Mode LED
is not lit, press the
AP Mode button.
C ) On your mobile device, go to Settings and join the Wi-Fi network “Envoy_
nnnnnn” (where “nnnnnn” equals the final six digits of the Envoy serial
number).
D ) The app informs you if the software on the Envoy is not the latest version
by displaying the Envoy Software Update message. If the app displays
this message, follow the on-screen instructions to update Envoy.
E ) For 5-10 minutes, you must keep your mobile device near the NPR.
Follow the on-screen instructions while the update takes place.
The update may take up to 20 minutes. The Envoy reboots several
times during the update and the LEDs light up in varied sequences
until the update is complete.
All four LEDs flash amber during boot up (approximately 3 minutes).
When boot up is complete, the Device Communications LED
lights solid amber, indicating that devices are not yet detected.
Once the update is finished and the PV system is installed, you are
ready for Installation Part 2.
F ) Close the Three-Phase NPR cover and
lock it with padlocks
.
6
CT installation diagram
System Breaker Panel
To Grid
AC to NPR (max 250kcmil 250A 90C Cu)
IQ Envoy (Internal to NPR) Terminal Blocks
Relay contacts
(if needed)
Not used
Optional
Consumption CTs
Split Core.
The arrows must point
toward the load — away
from the grid.
L1: White L1: Blue
L3: White L3: Blue
L2: White L2: Blue
xxxxxx
xxxxxx
Consumption CT leads
P1
C1 C2
1
2
3
4
NO
Ref
Common
C
Digital Input
Relay
PD, B300
OVC II
L1
L2
N
CU, 75C, 14AWG MIN
MEAS CAT III
OVC III
Production | Consumption
L3
P2 P3
C3
Production CTs
(Included within NPR and wired to IQ Envoy)
