I'm working on 6.4kW grid tied solar install which consists of 20 LG320 panels in 2 strings(10 + 10) and SMA SB 6.0-US string inverter. I'm going to run 6AWG bare copper unsplit GEC wire from the rails next to DC EMT conduit all the way to the building ground electrode. Panels will be grounded to the rails by manufacturer approved grounding bolts. Their DC conductors will go through SolaDeck roof penetration where wires will change from PV to THWN-2 type using terminal block inside SolaDeck and then run down through the attic inside 3/4" EMT conduit (4 DC conductors). Could someone please clarify few points for me:
1. Am I correct that DC side does not need OCPD or even fuses as DC wires go from each of 2 strings to the MPPT inputs individually? Inverter has 3 MPPT inputs but I'm going to utilize only 2.
2. Am I required to use grounding bushings to bind GEC to the DC conduit on both ends?
3. The inverter will be installed 8'-10' from the building on a stucco fence/wall which goes perpendicular to the building. Do I need to run GEC all the way to the inverter or GEC can branch off earlier to connect to the building ground conductor?
4. Both DC & AC conduits to the inverter will go inside sidewalk concrete for 4'-5'. Would this present any problem from grounding point of view?
5. The inverter AC conduit will have 4 conductors inside: L1, L2, N & EGC coming from main panel (no GEC). Do I need to bind EGC to the AC & DC conduits on the inverter side?
1. Am I correct that DC side does not need OCPD or even fuses as DC wires go from each of 2 strings to the MPPT inputs individually? Inverter has 3 MPPT inputs but I'm going to utilize only 2.
2. Am I required to use grounding bushings to bind GEC to the DC conduit on both ends?
3. The inverter will be installed 8'-10' from the building on a stucco fence/wall which goes perpendicular to the building. Do I need to run GEC all the way to the inverter or GEC can branch off earlier to connect to the building ground conductor?
4. Both DC & AC conduits to the inverter will go inside sidewalk concrete for 4'-5'. Would this present any problem from grounding point of view?
5. The inverter AC conduit will have 4 conductors inside: L1, L2, N & EGC coming from main panel (no GEC). Do I need to bind EGC to the AC & DC conduits on the inverter side?
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