7 Installation
Connecting the grid (AC)
78
Installation and operation manual M70A_260 Flex RPI703M26000 EU V1.1 EN 2022-08-02
7.7
Connecting the grid (AC)
►
Always observe the information in section
“5.4 Planning the grid connection (AC)”,
page 39!
7.7.1 General information
180 mm
Fig. 7.8:
Free space for wiring on the AC terminal block
Fig. 7.9:
Torques for AC terminal block
20 mm
20 mm
Fig. 7.10: Stripping length for AC cables
7.7.2 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.
NOTICE
To ensure a safe and reliable contact with alumi-
num conductors,
always
perform the following
work steps:
►
Keep the installation location as free
as possible from moisture or corrosive
atmospheres.
►
Connect the aluminum cables quickly.
►
Clean the stripped end of the aluminum
conductor mechanically (for example,
using a knife blade to scrape off the oxide
layer), then immediately dip the aluminum
conductor into acid-fee and alkaline-free (=
neutral) Vaseline and straight away insert it
into the Al-Cu compression joint.
