enphase M215-60-2LL-S23-IG Installation And Operation Manual page 34

You can sometimes avoid skipping Engage Cable connectors with the use of Engage Couplers.
Use the Engage Coupler to connect two Engage Cables or to connect Engage Cable to field
cable. There are many possible scenarios for each type of connection, but they generally fall into
four categories:
- Engage Cable to Engage Cable:
1. Make use of leftover lengths of Engage Cable
2. Transition between portrait and landscape Engage Cable
- Engage Cable to Field Cable (#12 TC-ER):
3. Transition between sub-arrays on the same circuit
4. Create wiring extensions for Engage Cable
NOTE: The Engage Coupler only supports #12 TC-ER, which may not be sufficient for
homerun wiring. Enphase Energy recommends maintaining less than 2% voltage drop
across all wiring.
In situations where you cannot use an Engage Coupler, you can use an electrical junction box to
transition between cable types.

Account for additional lengths of cable when calculating total voltage rise. Refer to the
following documents to maintain AC voltage rise at less than 2%:
o
Applications of the Engage Coupler
o
Circuit Calculations for the M215 Microinverter
o
Calculating AC Line Voltage Drop for M215 Microinverters with Engage Cables

Plan for additional length to reach from one row of PV modules to the next. If the PV
modules are laid out in multiple rows, the distance from one row to the next often requires
additional cabling length.

Account for bend radius. When planning cabling turns or loops, you must account for a
minimum bend radius of 4.75 inches (12 cm).

Consider additional cabling when installing multiple sub-arrays. Often, an AC branch circuit
may be composed of several smaller sub-arrays across more than one roof plane. In this case,
cut the cable to service each smaller array, and connect the sub-arrays together using
appropriately rated lengths of conduit. Accomplish the transition from cable to conduit using an
outdoor rated AC junction box, as required by the NEC and local code. Cover unused connectors
with Enphase sealing caps.

Account for any mixture of PV modules in both portrait and landscape orientation. When
PV modules are installed in mixed orientation (both portrait and landscape orientation), there are
three choices for cabling:
1. Cabling with 1.025-meter spacing between connectors results in cleanest install for the
PV modules in portrait orientation. For PV modules placed in landscape orientation, plan
for an unused connector between each PV module to accommodate the required
additional distance. Cover unused connectors with Enphase watertight sealing caps.
2. Cabling with 1.7-meter spacing between connectors results in cleanest install for PV
modules in landscape orientation, but requires that any additional cable length between
PV modules in portrait orientation be coiled and dressed so that cabling does not contact
the roof. Cover unused connectors with Enphase watertight sealing caps.
3. Transition between 1.025 and 1.7-meter spacing cable options using an outdoor-rated
junction box. Install this junction box to the PV racking.
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 2014 Enphase Energy Inc. All rights reserved.
M215 Installation and Operation
141-00012 Rev 06