Installation and Operation Manual (Rev E)
SGI Series Inverters
DOCR-060371
17
4.0 DC Connections from the PV Array and AC Connections to
the Electrical Utility Grid
WARNING:
All electrical installations shall be performed in accordance with all local
electrical codes and the National Electrical Code, Canadian Electrical Code for Canada
and NFPA 70. Only make AC connections directly to the AC breaker and DC
connections to the DC subcombiner panel.
4.1
Grounding Electrode Conductor (GEC)
As with all PV systems, a Grounding Electrode Conductor must be installed per NEC 690. This
conductor should be sized according to NEC requirements. Both a DC and AC GEC may be
required at the inverter in some instances. Two lug positions are provided on the ground bond
plate for the AC and DC grounding electrode conductors.
Figure 4.1 - AC and DC GEC Lug Positions
Cu or Al Conductors
Max. 1 x 1/0AWG-750kcmil
75C connections, 550 in-lbs
1 wire per lug
or
Max. 2 x 1/0AWG-300kcmil
75C connections, 550 in-lbs
2 wires per lug
WARNING:
Make sure to establish a solid connection from the inverter to the system
grounds before proceeding to connect any DC or AC power wires.
