3Installation
String PV Grid-tied Inverter SPI-B-H Series (175K-250K)
User Manual
32
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Ltd.
Table3-1
Wire requirements
Name
Type
Recommended wire diameter
（
mm
2
）
PV string input cable
1500V and above PV
cables
4~6
AC output cable
Outdoor
multi-core
cable or single-core
cable
Outdoor three/four core cable
：
70~240
(Maximum outer diameter<56mm);
Outdoor single-core cable
：
70~300 (Maximum
outer diameter<30mm).
Internal ground wire
Outdoor cable
Conductor cross-sectional area
≥
S/2 (S is the AC
output wire conductor cross-sectional area)
(Maximum outer diameter <25mm)
Ethernet
communication wire
8-core network cable
-
RS485 communication
wire
Shielded twisted pair
2*0.3 mm
2
（
Maximum outer diameter<14mm
）
External ground wire
Outdoor cable
Conductor cross-sectional area
≥
S/2 (S is the AC
output wire conductor cross-sectional area)
1. The cables in this table are based on UL copper wire. If other wires are used, please replace them
according to the standard. The wire materials selected by our company have passed the national
standard certification or UL certification. Refer to Table3-1 for the recommended cross-sectional
area of the wire when the user purchases the wire by himself (the wire is about 5 meters long).If the
wire length exceeds5meters, the cross-sectional area of the wire should be increased accordingly.
2. If the recommended terminal model is not adopted, please confirm with our company.
3. If using the aluminum wire, it should adopt copper-aluminum transition terminal.
3.6.3 External ground connection
Summary of Contents for SPI-B-H Series SPI175K-B-H
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