enphase IQ System Controller 3M Quick Install Manual page 24

Section C - Wiring
Aux wiring: IQ Load Controller
Up to two IQ Load Controllers, each enabling fine-grained, circuit-level control for 2 × 240 V or 4 × 120 V essential load circuits, can
be integrated with IQ System Controller. Each 240 V load can be controlled independently, but the 120 V loads can be controlled in
groups of up to two loads.
For detailed wiring instructions, refer to the IQ Load Controller quick install guide.
Do not use
NOTE: Control lines to headers support 28 AWG and 16 AWG wire gauges.
24 IQ System Controller 3M quick install guide