5 Planning the installation
Planning the grid connection (AC)
38
5.4.7 Permissible grid voltages
3P3W Voltage Range
3P4W Voltage Range
L1-L2 400 V
AC
-20%/+30%
L1-N
230 V
AC
-20%/+30%
L1-L3 400 V
AC
-20%/+30%
L2-N
230 V
AC
-20%/+30%
L2-L3 400 V
AC
-20%/+30%
L3-N
230 V
AC
-20%/+30%
5.4.8 Selecting the AC cable
5.4.8.1 Technical properties of the AC terminal block
Connection type
Screws with hexagon socket head
Rated current I
N
96 A
Rated voltage U
N
1000 V
Attaching the conductor
Type of attachment
●
8 mm hexagon socket (L1,
L2, L3, N)
●
M8 nut (PE)
Tightening torque
●
31 Nm (L1, L2, L3, N)
●
14.7 Nm (PE)
Table 5.1.: Technical properties of the AC terminal block
180 mm
Fig. 5.14: Free space for wiring on the AC terminal block
5.4.8.2 Notes on calculating the cable cross-section
►
Consider the following factors when calculating the cable
cross-section:
– Cable material
– Temperature conditions
– Cable length
– Installation type
– Voltage drop
– Loss of power in the cable
►
Always follow the IEC 60364-5-52 requirements and your
country-specific installation instructions.
►
France: Follow the installation instructions of UTE 15-712-
1. This standard contains the requirements for minimum
cable diameters and for avoiding overheating due to high
currents.
►
Germany: Follow the installation instructions of VDE 0100-
712. This standard contains the requirements for minimum
cable diameters and for avoiding overheating due to high
currents.
5.4.8.3
Specifications for copper AC cables
Min./max. Cable diameter
26.0 … 57.0 mm
Min./max. Wire cross-section
Without wire end sleeve
●
Rigid cable
35 ... 120 mm
2
●
Multi-wire cable
35 ... 120 mm
2
With wire end sleeve
●
Flexible cable
35 ... 120 mm
2
Stripping length
20 mm
Table 5.2.:
Specifications for copper AC cables
20 mm
20 mm
Fig. 5.15: Stripping length for conductors of copper cables
5.4.8.4
Specifications for aluminum AC cables
Aluminum cables can only be used in conjunction with
Al-Cu compression joints (see “5.4.9 Special tools required”,
Min./max. Cable diameter
26.0 … 57.0 mm
Min./max. Wire cross-section
Without wire end sleeve
●
Rigid cable
35 ... 120 mm
2
●
Multi-wire cable
35 ... 120 mm
2
Table 5.3.:
Specifications for aluminum AC cables
Installation and Operation Manual for Solar Power Inverter M70A EU V2.0 EN 2020-08-03
