Siemens GM-SG - Page 43

Circuit
Breaker Positions
1
.
Close
the circuit breaker
compartment
door and
secure
all latches
.
2
.
Insert
the
racking
crank
on
the
racking
screw on
the
front of
the circuit breaker cell
,
and
push
in
(
see
"
Racking
Crank
Engagement
Procedure
”
)
.
This action
operates
the
racking
interlock latch
.
3
.
Rotate
the
racking
crank counterclockwise
until
the
circuit
breaker
is
in
the
DISCONNECT
position
.
4
.
Open
the circuit breaker
compartment
door
and insert
the
two
extension rails into the
fixed
rails
.
Be
sure
the
extension rails
are
properly
secured
in
place
.
Figure
41
,
Use
of
Extension Rails
for
Removal
of
Circuit
Breaker
from
Upper
Compartment
A
WARNING
Heavy
weight
.
Can
result
in
death
,
serious
injury
or
property
damage
.
Always
use
extension
rails
to
remove or
install circuit breaker
in
cells
not
installed
at
floor
level
.
T
5
.
Depress
and hold down the circuit breaker
Racking
Latch Release Handle
(
see
Figure
38
)
and
pull
the
circuit
breaker
out
from
the
DISCONNECT
position
.
The
circuit breaker
can now
be
removed
from
the
cubicle
and rolled
out
on
to
the
two
extension rails
.
6
.
Remove
the circuit breaker
from
the
two
extension
rails
using
the
approved
Siemens
circuit breaker
lifting
device
(
see
Figures
42
and
43
A
)
or a
lifting
sling
(
see
Figure
50
A
)
and
a
suitable
crane
.
7
.
Lift
the
two
extension rails and withdraw them
from
the
switchgear
.
8
.
Close
the circuit breaker
compartment
door and
secure
all
latches
.
Type
GMSG
circuit breakers
weigh
430
-
680
lbs
(
195
-
308
kg
)
,
depending
upon
their
ratings
.
The circuit breaker
can
be moved
using
a
properly
rated
crane
and
lift
sling
.
A
lift
sling
can
be attached
to
the circuit breaker
,
and then
used
to
hoist
the
circuit
breaker
vertically
clear
of
the
extension rails
.
When clear
,
remove
the rails and lower
the circuit breaker
to
the
floor
.
Figure
42
,
Lift
Truck
Engaged
-
Note
Position
of
Indicator
Pin
Figure
43
A
,
Lift
Truck
with
Circuit
Breaker
A
WARNING
Heavy
weight
.
Can
result
in
death
,
serious
injury
or
property
damage
.
Do
not
transport
a
circuit breaker
on a
lift
truck
or
other
lifting
device
with
the
circuit
breaker
in
the raised
position
.
T
Figure
43
B
.
Lift
Truck
with
Rollout
Tray
41
Courtesy of NationalSwitchgear.com