INSTALLATION INSTRUCTION
Installing Enphase 400A Production CTs
Use this instruction with the Enphase IQ Gateway Commercial 2 Quick Install Guide to install Enphase production monitoring Current
Transformers (CTs). The Enphase IQ Gateway Commercial 2 uses a set of three 400A solid core CTs for monitoring solar production current.
This CT performs metering with accuracy class of 0.2%. Rated at Pollution Degree 3, you can use the CT inside electrical equipment in residential
or in harsh, industrial conditions. Read and follow all warnings and instructions in this instruction and in the Quick Install Guide included with your
Gateway and available at: https://enphase.com/installers/resources/documentation.
INSTALLATION
For more information, refer to the IQ Gateway
Commercial 2 Quick Install Guide available at:
https://enphase.com/installers/resources/
documentation.
Preparation
A ) If not already done, turn off
power to the PV system.
Remove any pre-installed production CTs
A ) Remove the line 1, line 2 and line 3 conductors of the solar produc-
tion circuits on which the CTs are connected.
B ) Remove the existing CTs.
Install the production CTs
A ) Before running the CT wires through the conduit, use colored tape to
mark one of the CTs and the free end of its wires.
B ) For each CT, locate the arrow on the CT label.
C ) Refer to the diagram on the reverse of this document for wiring.
D ) Install the production CTs on active phases as required:
• Locate the arrow on the CT label.
• To monitor production on Line 1:
- Connect the white wire to the white “P1” terminal and the blue
wire to the blue “P1” terminal.
- Pass Line 1 of the solar production circuit through the CT with
the arrow pointing toward the load (away from the solar array).
• To monitor production on Line 2:
- Connect the white wire to the white “P2” terminal and the blue
wire to the blue “P2” terminal.
- Pass Line 2 of the solar production circuit through the CT with
the arrow pointing toward the load (away from the solar array).
• To monitor production on Line 3:
- Connect the white wire to the white “P3” terminal and the blue
wire to the blue “P3” terminal.
- Pass Line 3 of the solar production circuit through the CT with the
arrow pointing toward the load (away from the solar array).
•Tighten all connections to 5 in-lbs (0.6 N m).
E ) Close and secure the terminal block door of the Gateway.
F ) Turn on the PV system.
SAFETY
SAFETY AND ADVISORY SYMBOLS
+DANGER: This indicates a hazardous situation, which if not avoid-
ed, will result in death or serious injury.
✓NOTE: This indicates information particularly important for opti-
mal system operation. Follow instructions carefully.
SAFETY INSTRUCTIONS
+DANGER: To reduce the risk of electric shock, always open or
disconnect circuit from power-distribution system (or service) of
building before installing or servicing current transformers.
+DANGER: Risk of electrocution! Do not install CTs when current
owing in the sensed circuit. Always install CT wires in the termi-
nal blocks before energizing the sensed circuit.
+DANGER: If equipment is used in a manner not specied by
Enphase Energy, the protection provided by the equipment may
be impaired.
+DANGER: Risk of electric shock. Be aware that installation of
this equipment includes risk of electric shock. If you wire the IQ
Gateway at the subpanel, always de-energize the subpanel before
beginning.
+DANGER: Risk of electric shock. Risk of re. Only qualied per-
sonnel should troubleshoot, install, or replace the CTs.
✓NOTE: Because of variance in switchboard design and main power
feed, there may not always be enough space to install CTs.
✓NOTE: Do not install the CTs in a switchboard where they exceed
75% of the wiring space of any cross-sectional area within the
equipment.
✓NOTE: Perform all electrical installations in accordance with all
national and local electrical codes.
✓NOTE: Restrict installation of current transformers in an area
where they would block ventilation openings, or in area of breaker
arc venting.
✓NOTE: Not suitable for Class 2 wiring methods and not intended
for connection to Class 2 equipment.
✓NOTE: Secure current transformer and route conductors so that
they do not directly contact live terminals or bus.
✓NOTE: When wiring the IQ Gateway Commercial 2 for production
and consumption metering, be sure to install the current trans-
formers (CTs) exactly as described for your application.
✓NOTE: 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 Gateway, 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.
✓NOTE: Only run active conductors through the CT. The CT can
monitor multiple active conductors. You may run more than one
wire through the CT if all wires are on the same phase and they t
the opening in the CT.
✓NOTE: For indoor use only.
SPECIFICATIONS
SPECIFICATION CT-400-SOLID
CT type Solid core
CT accuracy (error rate) <0.5%
Max primary supported current 400A
Turns ratio 2000
Pollution degree 3
Dimensions 2.99inch diameter * 0.712inch thickness
Aperture 1.69inch diameter
Supported Cable Size Up to a maximum size of 1000KCMIL
conductors.
Primary voltage (range) 250VAC max
Frequency 50-60Hz
Operating temperature -40 to 85 degree C
Humidity 95%
Pollution degree 3
Compliance ROHS(latest version)
