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Cabling Ordering Options
Ordering options include:
Model number
ET10-277-BULK
ET17-277-BULK
ET21-277-192-12AWG
Planning for Cable Lengths and Type
The Cabling System is flexible enough to adapt to almost any solar design. To determine the length and
cable type that you need, apply the following considerations:
▪
Account for the number of Enphase Microinverters to be installed on the AC branch
circuit. Make sure to allocate the correct number of connectors, including extra connectors for
gaps and turns.
▪
Plan for additional cable length to reach from the AC branch circuit junction box to the
first microinverter. If greater than half a connector interval is needed, you may need to allow for
one (or more) unused connectors in order to span this distance. You must cover unused
connectors with Enphase watertight sealing caps.
▪
Minimize the number of unused Engage Cable connectors with three-phase systems. When
cable connectors are left unused on a three-phase system, it creates a phase imbalance on the
branch circuit. If multiple cable connectors are skipped over multiple branch circuits, the
imbalance can multiply.
You can avoid skipping Engage Cable connectors with the use of an Engage Coupler (ET-SPLK-
05). 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.
33
Voltage type /
conductor count
277 VAC,
5 conductor
277 VAC,
5 conductor
277 VAC,
5 conductor
2015 Enphase Energy Inc. All rights reserved.
C250 System Installation and Operation
Connector
Connector
count
spacing
240
1.025 m (40 in.)
240
1.7 m (67 in.)
192
2.11 m (84 in.)
PV module
orientation
Portrait, 60- and 72-
cell modules
Landscape, 60-cell
modules
Landscape, 72-cell
modules
141-00025 Rev 03
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