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5 Planning the installation
Planning the grid connection (AC)
5.4.8.5 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.
5.4.9 Special tools required
Use an insulated torque wrench.
Installation and Operation Manual for Solar Power Inverter M70A EU V2.0 EN 2020-08-03
