Permissible Grid Voltages; Selecting The Ac Cable - Delta M70A-260 Installation And Operation Manual

5.4.7 Permissible grid voltages

3P3W Voltage Range
L1-L2 400 V -20%/+30%
AC
L1-L3 400 V -20%/+30%
AC
L2-L3 400 V -20%/+30%
AC

5.4.8 Selecting the AC cable

5.4.8.1 Technical properties of the AC terminal block
Connection type
Rated current I
N
Rated voltage U
N
Type of attachment
Tightening torque
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.
Installation and operation manual M70A_260 Flex RPI703M26000 EU V1.1 EN 2022-08-02
3P4W Voltage Range
L1-N 230 V -20%/+30%
AC
L2-N 230 V -20%/+30%
AC
L3-N 230 V -20%/+30%
AC
Screws with hexagon socket head
112 A
1000 V
●
8 mm hexagon socket (L1,
L2, L3, N)
●
M8 nut (PE)
●
31 Nm (L1, L2, L3, N)
●
14.7 Nm (PE)
5 Planning the installation
Planning the grid connection (AC)
► 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
Min./max. Wire cross section
Without wire end sleeve
●
Rigid cable
●
Multi-wire cable
With wire end sleeve
●
Flexible cable
Table 5.2.: Specifications for copper AC cables
5.4.8.4 Specifications for aluminum AC cables
Min./max. Cable diameter
Min./max. Wire cross section
Without wire end sleeve
●
round, single-wire (rs)
●
round, multi-wire (rm)
●
1)
sector-shaped (ss)
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.
33.0 to 77.0 mm
2
35 to 120 mm
35 to 120 mm 2
2
35 to 120 mm
33.0 to 77.0 mm
60 to 120 mm 2
2
60 to 120 mm
2
60 to 120 mm
41