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INSTALLATION — Part 1
It is a best practice to complete Installation Part 1 before installing
Enphase Microinverters and/or Batteries.
1
Choose a location for the IQ Combiner 3
A ) Install the IQ Combiner 3 in a readily accessible location, at least three
feet (91 cm) off the ground if outdoors. Install it at least 12 inches
(30.5 cm) off the ground if installed indoors.
B ) Consider the dimensions of the IQ Combiner 3, easy access, box
height, and length of cable when selecting the location. The IQ Com-
biner 3 is rainproof but not watertight.
C ) Mount the IQ Combiner 3 on a vertical surface.
NOTE: You must mount the Combiner within 15 degrees of vertical.
2
Install Circuit Breaker(s)
The combiner includes one two-pole 10A circuit breaker that feeds the IQ
Envoy and the AC outlet (if present). You can install additional breakers, if
needed. You must follow all NEC and local electrical codes.
A ) Open the enclosure door. Pinch the top of the hinge rod using a pair
of needle-nosed pliers. Slide the door up and away to remove it. Set
the door aside for later reattachment.
NOTE: Risk of equipment damage. Do not remove the pre-installed
heat shield attached to the enclosure door.
B ) Remove the plastic deadfront. It is not necessary to completely
remove the screws.
Warning! Risk of electric shock. To maintain the warranty,
do not modify the dead-front other than to remove or
replace filler plates, as needed.
C ) Remove a filler plate on the deadfront for each breaker position you
will use. To remove the filler plate, press the single latch inward while
gently pushing the filler plate out.
D ) Snap the breaker onto the busbar, using only the breaker positions
indicated in the diagram on the door of the unit.
3
Drill Holes to Accept Conduit
Warning! Risk of equipment damage. Do not drill conduit
holes on the top of the box or at any location that allows
moisture ingress.
A ) The bottom and sides of the Combiner 3 are the best locations to
drill holes for conduit fittings. Rear conduit entry below the busbar
assembly is also supported.
Note: When drilling, consider the internal parts of the combiner. Make
sure that the holes do not interfere with the internal workings, me-
chanics, or the deadfront legs in the corners of the Combiner.
Best Practice: Use a stepped drill bit for making 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.
4
Wire the Output Connections
Refer to the diagram on the door of the IQ Combiner 3 and do the following:
A ) Use conductors sized per local code requirements 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 Envoy 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.
5
Wire Inputs from the AC Branch Circuits
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 will
typically use up to four 20 A breakers. Refer to the diagram on the door of
the IQ Combiner 3 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.
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.
CONNECTION
Eaton BR series DG breaker(s)
60 A circuit breaker only
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.
WIRE SIZES
TORQUE
14-10 AWG
2.2 Nm (20 in-lb)
8 AWG
2.8 Nm (25 in-lb)
6-4 AWG
3.0 Nm (27 in-lb)
4-1/0 AWG
5.0 Nm (45 in-lb)
14-1/0 AWG
5.0 Nm (45 in-lb)
14 - 6 AWG
2.2 Nm (20 in-lb)
10-4 AWG
5.0 Nm (45 in-lb)
3-2/0 AWG
5.6 Nm (50 in-lb)
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