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3
Drill Holes to Accept Conduit
A ) The bottom and sides of the IQ Combiner 4/4C are the best locations
to drill holes for conduit fittings. Rear conduit entry below the busbar
assembly is also supported.
Warning! Risk of equipment damage. Do not drill conduit
holes on the top of the box or at any location that allows
moisture ingress.
NOTE: When drilling, consider the internal parts of the combiner. Ensure
the holes do not interfere with the internal workings, mechanics, or the
dead front legs in the corners of the combiner.
Best Practice: Use a stepped drill bit to make the conduit holes. Using
a hole saw may crack the plastic housing. As an alternative, use a sharp
chassis punch with caution.
B ) Use a snap punch or other type of center punch to prevent the drill
from wandering. Drill a pilot hole with a smaller drill before using a
step drill bit.
C ) Use only UL-Listed rain-tight hubs for wire entry into the enclosure.
Warning! Risk of equipment damage. Observe bend radius
requirements when routing wires.
Wire the Output Connections
4
Refer to the diagram on the door of the IQ Combiner 4C and do the following:
A ) Use conductors sized according to the local laws taking into consid-
eration the voltage drop/rise and upstream breaker or fuse.
B ) The two terminals below the circuit breaker(s) are the output connec-
tions. Install L1 into the left terminal and L2 into the right terminal.
C ) Connect the neutral (white) to the neutral busbar.
NOTE: Enphase IQ Series Microinverters use a two-wire system and do
not use a Neutral. However, the IQ Gateway in the combiner still requires
a Neutral from the load center.
D ) Connect the ground (green or green/yellow) to the Ground busbar.
E ) Torque all connections as indicated by the table below.
Wire Inputs from the AC Branch Circuits
5
You can install AC branch circuit breakers up to 80 A total (sum of handle
ratings, excluding the 10 A breaker). With individual branch circuits, you
typically use up to four 20 A breakers. Refer to the diagram on the door of
the IQ Combiner and do the following:
A ) Use copper conductors sized to meet local code requirements and
voltage drop/rise considerations.
B ) Bring in the wires from each AC branch circuit.
C ) Connect the ground (green or green/yellow) to the ground busbar.
D ) Pass the L1 conductors from each PV branch circuit through the Produc-
tion CT in the same direction as the arrow on the side of the CT.
E ) If you use the fourth (Battery/PV) breaker position for PV, you must route
the L1 conductor through the Production CT.
NOTE: Do not pass conductors from AC Battery branch circuits through
the Production CT. This will distort production readings. The IQ Battery
circuits must terminate on the load side of the Consumption CTs.
F ) Connect L1 and L2 (usually one black and one red) from each AC branch
circuit (PV and/or battery) to the circuit breaker(s). Observe the L1 and
L2 polarity marking at each breaker position.
G ) Torque all connections as indicated by the following table.
H) For IQ8 installations, you must install hold down kits for the breakers
for PV branch circuits as per the NEC code. Refer to the installation
instructions of the hold down kit for installing the hold down kit for IQ8
systems.
3
CONNECTION
DG Breaker(1, 2, 3, 4)
60 A circuit breaker only
IQ Gateway Breaker
Neutral and ground
Large screw
Small screw
Main lug
Copper conductors only, rated minimum 75°C. Follow NFPA 70 (NEC) or
CSA C22.1 part 1 and all local codes.
For DG breakers larger than 20 A, use wire insulated for 90°C based on
75°C ampacities.
6
Install CTs for Consumption Metering
(Mandatory for Enphase Storage Systems)
The IQ Gateway printed circuit board inside the IQ Combiner 4C or IQ Com-
biner 4 is pre-wired at the terminal blocks for power and production metering
connections. One solid-core current transformer (CT) is provided for revenue
grade production metering. A pair of split-type or clamp-type CTs is provided
for consumption metering. To install them, create a protected route using
conduit for the CT wires from the main load center to the IQ Gateway. If you
need to extend the wires, refer to the Enphase IQ Gateway Installation and
Operation Manual at:
enphase.com/support.
NOTE: Because of variance in load center design and main power feed,
there may not always be enough space to install consumption metering
CTs.
If you received the split-type CT with white and blue wires, then follow these
steps:
A ) Ensure the main load center wires are de-energized until you have se-
cured the CT wires in the terminal blocks.
B ) Before running the CT wires through the conduit, use colored tape to
mark one of the CTs and the free end of its wires.
C ) For the marked CT wires, connect the white and blue wires to the white
and blue "C1" terminals as shown in Figure C.
D ) For the unmarked CT wires, connect the white and blue wires to the
white and blue "C2" terminals as shown in Figure C.
E ) Tighten all connections to 5 in-lbs.
F ) Clamp the marked CT on the load center feed wire Line 1 (matching the
IQ Gateway's "L1" voltage terminal) with the CT arrow pointing toward
the load (away from the grid).
G ) Clamp the unmarked CT on the load center feed wire Line 2 (matching
the IQ Gateway's "L2" voltage terminal) with the CT arrow pointing
toward the load (away from the grid).
If you received the clamp-type CTs, (one with red-black and another with
purple-brown wires), then follow these steps:
A ) Ensure the main load center wires are de-energized until you have se-
cured the CT wires in the terminal blocks.
B) Clamp the red and black C1 CT on the load center feed wire Line 1
(matching the IQ Gateway's "L1" voltage terminal) with the CT arrow
pointing toward the load (away from the grid) as shown in Figure D.
C) Clamp the purple and brown C2 CT on the load center feed wire Line 2
(matching the IQ Gateway's "L2" voltage terminal) with the CT arrow
pointing toward the load (away from the grid) as shown in Figure D.
D ) Tighten all connections to 5 in-lbs.
WIRE SIZES
TORQUE
14-10 AWG
2.2 Nm (20 lb-in)
8 AWG
2.8 Nm (25 lb-in)
6-4 AWG
3.0 Nm (27 lb-in)
4-1/0 AWG 5.0 Nm (45 lb-in)
14-10 AWG 2.26 Nm (20 lb-in)
2-1/0 AWG
5.6 Nm (50 lb-in)
14-3 AWG
5.1 Nm (45 lb-in)
6 AWG
3.6 Nm (32 lb-in)
8 AWG
2.6 Nm (23 lb-in)
10-14 AWG
2.3 Nm (20 lb-in)
10-4 AWG
5.0 Nm (45 lb-in)
3-2/0 AWG
5.6 Nm (50 lb-in)
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