Number Of Microinverters Per Branch Circuit; Grounding Considerations; Ac Cable And Accessories - enphase IQ8 Design Manual

DC adapter cables
EN4 (TE PV4-S SOLARLOK) 150 mm/5.9" to Staubli MC4 (Default Supply)
EN4 (TE PV4-S SOLARLOK) to 150 mm/5.9" non-terminated cable (Pack
of 12 pairs - Optional) 1
EN4 (TE PV4-S SOLARLOK) 1000 mm/39.4" to Staubli MC4 (Pack of 12 pairs -
Optional)
EN4 (TE PV4-S SOLARLOK) to 1000 mm/39.4" non-terminated cable (Pack of 12
pairs - Optional)
1
Qualified per UL subject 9703; 2. For field wiring of UL-certified DC connectors

2.1.4 Number of microinverters per branch circuit

Plan your AC branch circuits with the maximum recommended microinverters per branch (12
IQ8P-3P or 15 IQ8H-3P), with each branch protected by a 3-pole 20 A overcurrent protection
device (OCPD). In case you are skipping a connector, ensure each branch circuit has an equal
number of microinverters per phase (L-L connection), that is, L1-L2, L2-L3, and L3-L1. You can
check the marking on connectors C1(L1-L2), C2(L2-L3), and C3(L3-L1) to count the number of
microinverters per phase in a branch circuit. For connector marking details, see
Grid Interconnection
208 VAC three-phase
Limits may vary. Refer to local requirements to define the number of microinverters per branch in your area.
*

2.1.5 Grounding considerations

The Enphase IQ8 Commercial Microinverters do not require grounding electrode conductors
(GEC) nor equipment grounding conductors (EGC). Your Authority Having Jurisdiction (AHJ)
may require you to bond the mounting bracket to the racking. If so, use UL2703 hardware or star
washers.
The microinverter has a Class II double-insulated rating, which includes ground fault protection
(GFP). To support GFP, use only PV modules equipped with DC cables labeled PV Wire or PV
Cable.

2.2 AC cable and accessories

QD Cable is a 12 AWG cable with four conductors for L1, L2, L3, and neutral sense. QD Cable has
power on two phases, sensing on the remaining phase and neutral for phase loss detection. This
arrangement alternates between connectors for each drop to achieve self-phase balancing. The
QD Cable 4-pin male connectors plug directly into the IQ8 Commercial Microinverters, whose
double insulated rating requires no grounding conductors.
Each connector on the QD Cable is marked with phase ID C1, C2, and C3, with each connector
type connected to C1(L1-L2), C2(L2-L3), and C3(L3-L1) as shown in
rotation arrangement continues throughout the cable. For a detailed understanding of phase
rotation and phase balancing the IQ8 Commercial Microinverter system, see
balancing in IQ8 Commercial installations using the three-phase QD Cable phase
14
Table 4: Maximum microinverters per 20 A branch circuit*
Maximum number of IQ8 Commercial Microinverters per branch
circuit (IQ8P-3P-72-E-US/IQ8H-3P-72-E-US)
12 microinverters /15 microinverters
© 2023 Enphase Energy Inc. All rights reserved.
IQ8 Commercial Microinverter grid-tied PV system
Figure
Model SKU
ECA-EN4-S22
ECA-EN4-FW-12
ECA-EN4-FW-10-12
ECA-EN4-S22-18-12
Figure 4.
4. A similar phase
Appendix B: Phase
rotation.
November 2023
USG-00026-1.0