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IQ System Controller 3/3G Quick Install Guide
Control (CTRL) wiring
between system components
Section C - Wiring
Control wiring guidance for the Enphase Energy System:
Refer to the following wiring sequences to understand the position
of the header with termination resistor, wiring order, and drain wire
termination location.
NOTE: Ensure the following guidelines are followed to avoid
failures during system commissioning:
• One header with termination resistor should be installed
on each component that is at the extreme end of the
control network.
NOTE: Total length of CTRL wiring across the system cannot
exceed 250 feet to ensure the system operates as per
specications.
• The drain wire should only be terminated on one end of the
control wiring between system components
• It is recommended that the drain wire be terminated at the
component from which the control wiring for the section is
initiated
• The same conduits can be used for power and control wire
routing only when using an Enphase CTRL cable i.e.,
CTRL-SC3-NA-01.
The following are four common wiring sequences:
Sequence 1a: IQ Combiner 5/5C → IQ System Controller 3G → IQ Battery(s) 5P
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