enphase M215 Installation And Operation Manual page 31

the branch circuit. If multiple cable connectors are skipped over multiple branch circuits, the
imbalance can multiply.

Additional length required 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.

Bend radius. When planning cabling turns or loops, you must account for a minimum bend
radius of 4.75 inches (12 cm).

Multiple sub-arrays. Often, the AC branch circuit may be composed of several smaller sub-
arrays across more than one roof plane. In this case, the cable is cut to service each smaller
array, and the sub-arrays are connected together using appropriately rated lengths of
conduit. The transition from cable to conduit is accomplished using an outdoor-rated AC
junction box, as required by the NEC and local code. Unused connectors must be covered
with Enphase watertight sealing caps.

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 additional
distance. Unused connectors must be covered 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 the cable does not
contact the roof. Again, unused connectors must be covered with Enphase watertight
sealing caps.
3. Another solution when PV modules are installed in mixed orientation is to transition
between 1.025 and 1.7-meter spacing cable options using the Engage Coupler or an
outdoor-rated junction box. This junction box can be installed to the PV racking. Refer to
http://enphase.com/products/engage-coupler/
31
 2013 Enphase Energy Inc.
M215 Installation and Operation
for information on the Engage Coupler.
141-00012 Rev 05