Electrical Connection; Safety; Electrical Connection Overview - CanadianSolar CSI-75K-T40001-E User Manual

5 Electrical Connection

5.1 Safety

Prior to any electrical connections, keep in mind that the inverter has dual power supplies.
It is mandatory for the qualified personnel to wear personal protective equipments (PPE) during the electrical work.
• Danger to life due to a high voltage inside the inverter!
• The PV string will generate lethal high voltage when exposed to sunlight.
• Before starting electrical connections, disconnect the DC and AC circuit. breakers and
DANGER
prevent them from inadvertent reconnection.
• Ensure that all cables are voltage free before performing cable connection.
• Any improper operations during cable connection can cause device damage or personal injury.
• Only qualified personnel can perform cable connection.
• All cables must be undamaged, firmly attached, properly insulated and adequately
WARNING
dimensioned.
• Comply with the safety instructions related to the PV strings and the regulations related to
the utility grid.
NOTICE
• All electrical connections must be in accordance with local and nationalstandards.
• Only with the permission of the utility grid, the inverter can be connected to the utility grid.

5.2 Electrical Connection Overview

Electrical connection in the PV system includes additional grounding connection, AC connection, and PV string
connection.
A
A） PV string; B）Inverter; C）AC distribution box/cabinet; D）Utility grid; E）Monitoring device
Table 5-1 Recommended Cables
No. Cable Name
1 DC cable
Additional
2
Grounding cable
3 AC cable
Communication
4
cable
Wireless
5
communication
14 /41
B
2
1 3
FIG 5-1 General electrical connection diagram
Cable Type
PV cable, complying with 1500V
standard
Outdoor single core copper
conductor cable
Four/Five-core outdoor copper or
aluminum cables*
Shielded twisted pair (terminal
block)
CAT-5 Ethernet cable (RJ45)
N/A
C D
Conductor Cross-Sectional Area
4~6mm²
The same as that of the PE wire in
the AC cable
1) 75KW: 4 or 5 x 50~185 mm²
75KW: 3 x 240+1 x 120mm²
2) 100~120KW: 4 or 5 x 70~185 mm²
100~120KW: 3 x 240+1 x 120mm²
PE wire: refer to
2 PE wire requirements"
0.5~1.5 mm²
N/A
N/A
5 Electrical Connection
E
4 5
"table 5-
Outer
Diameter
6~9mm
N/A
26~57mm
4.5~6.5mm
N/A