4.3.
Electrical
connection
Installation
Electrical
installation
work
may
only
be
carried
out
by
a
skilled
electrician
Electrical
protection
The
wire
cross
‐
sections
and
switching/monitoring
devices
must
be
de
‐
signed
with
due
consideration
of
the
startup
type
and
maximum
current.
The
customer
must
ensure
that
an
appropriate
motor
protection
relay
is
in
‐
stalled.
In
the
case
of
the
direct
activation
of
the
fan,
the
motor
develops
a
high
starting
torque
at
a
high
starting
current;
this
can
be
up
to
5
to
8
times
the
nominal
current
depending
on
the
impeller
class.
These
values
must
be
taken
into
consideration
when
choosing
the
fuses.
Potential
equalization
For
the
extraction
of
non
‐
conductive
dusts,
the
device,
each
individual
ductwork
part,
all
dust
collection
elements,
and
flexible
tubes
must
be
grounded
by
means
of
potential
equalization.
The
connection
of
multiple
potential
equalization
systems
to
a
single
at
‐
tachment
point
is
not
allowed.
Each
connection
must
be
individually
at
‐
tached
to
a
copper
bar.
This
bar
itself
must
be
grounded
with
the
switching
system.
