Siemens GMI Series

Installation
Checks
and Initial
Functional Tests
The
procedure
for
removal
of
an
upper
circuit
breaker
is
:
1
.
Insert the
two
extension
rails into the
fixed
rails
.
Be
sure
the
extension rails
are
properly
secured
in
place
.
(
This
can
be
done
at
Step
4
if
preferred
.
)
2
.
Insert
the
racking
crank
on
the
racking
screw
on
the
front of
the
breaker
cell
,
and
push
in
.
This action
operates
the
racking
interlock
latch
.
Figure
3
shows
racking
of
a
circuit
breaker
in
the
upper
cell
.
3
.
Rotate the
racking
crank
counterclockwise
until the breaker
is
in
the
Disconnect
position
.
If
the
racking
crank is
not
of
the
"
Captive
"
type
,
constant
pressure
is
required
during racking
to
maintain
engagement
with
the
racking
mechanism
.
4
.
If
you
have
not
yet
installed the extension
rails
,
do
so now
.
Note that
some
difficulty
may
be
experienced
installing
the
extension rails
if
the circuit
breaker is
in
the
Disconnect
position
.
If
difficulty
is encountered
,
rack
the circuit breaker
to
the
Test
position
,
install
the extension
rails
,
and then rack
the circuit
breaker
to
the
Disconnect
position
.
4
.
The
circuit
breaker
is
now
free
to
be rolled
out
on
the
floor
using
the
handles
as
shown
in
Figure
4
.
The
wheels
of
the
circuit breaker
are
virtually
at
floor
level
(
unless the switch
-
gear
is installed
on a
raised
pad
)
,
and
one
person
can
easily
handle
the
unit
.
Removal
from
Upper
Cell
(
Indoor and
Shelter
-
Clad Out
-
door
Switchgear
)
-
Removal
of
the
upper
breaker
in
a
two
-
high
assembly
is
similar
to
removal
of
a
breaker
from
a
lower cell
,
with
several
additional
steps
.
Figure
5
shows
one
of
the
two
breaker extension rails
being
inserted into the
fixed
rails
within
the
upper
cell
of
two
-
high
switchgear
equipment
.
The rails
engage
locking
pins
in
the
fixed
rails
to
secure
them
in
position
.
AWARNING
Heavy
Weight
Can
cause
death
,
serious
injury
,
or
property
damage
.
Always
use
extension rails
to
remove or
install
circuit breaker
in
the
upper
cell
or
in
cells
not
installed
at
floor
level
.
5
.
Move the breaker
release
latch
to
the
left
and
pull
the
circuit
breaker
out
from
the Disconnect
position
.
The breaker is
now
free
to
be rolled
out
on
the
two
extension
rails
using
the
handles
on
the
front of
the
circuit
breaker
.
6
.
Remove the
breaker
from
the
two
extension
rails
using
the
approved
Siemens
breaker
lifting
device
.
7
.
Lift
the
two
extension rails and withdraw
them
from
the
switchgear
.
Figure
3
:
Racking
Circuit
Breaker
in
Switchgear
.
Figure
5
:
Use
of
Extension Rails
for
Upper
Compartment
.
Figure
4
:
Removal
of
Circuit
Breaker
.
5
Courtesy of NationalSwitchgear.com