41
5 Planning the installation
Planning the grid connection (AC)
Installation and operation manual M70A_260 Flex RPI703M26000 EU V1.1 EN 2022-08-02
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
112
A
Rated voltage U
N
1000 V
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 specification for the AC terminal block
180 mm
Fig. 5.17: 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
33.0 to 77.0 mm
Min./max. Wire cross section
Without wire end sleeve
●
Rigid cable
35 to 120 mm
2
●
Multi-wire cable
35 to 120 mm
2
With wire end sleeve
●
Flexible cable
35 to 120 mm
2
Table 5.2.:
Specifications for copper AC cables
5.4.8.4
Specifications for aluminum AC cables
Min./max. Cable diameter
33.0 to 77.0 mm
Min./max. Wire cross section
Without wire end sleeve
●
round, single-wire (rs)
60 to 120 mm
2
●
round, multi-wire (rm)
60 to 120 mm
2
●
sector-shaped (ss)
1)
60 to 120 mm
2
1) Observe the installation instructions for the use of sector-shaped aluminum
cables (see section 5.4.8.7, p. 42)
Table 5.3.:
Specifications for aluminum AC cables
5.4.8.5 SpStripping length
20 mm
20 mm
Fig. 5.18: Stripping length for AC cables
5.4.8.6 Handling aluminum conductors during installation
work
►
The special properties of aluminum must be taken into con-
sideration when using aluminum conductors:
–
Aluminum "flows," i.e. it gives way under pressure.
–
A thin non-conductive oxide layer forms within a few
minutes on de-insulation, which increases the contact
resistance between the conductor and clamping point.
–
The specific conductivity and hence the current carry
-
ing capacity is approximately one third less than that of
copper.
