GE AKR-75 Series Instructions - Installation And Operation page 9

GEI-86151 B
Breaker
Insertion (Code
B)
1.
Prior
to
lifting
a
breaker
to its intended compartment
location, observe the following precautions:
a.
Check
the
compartment
to
insure that
it is free ot
foreign objects.
b.
Verify
that the breaker
is
the correct type
for
that
compartment.
c.
lnsure that the breaker
is
OPFN.
d.
Apply a thin, fresh coat of D50HD38 lubricant to the
b
reake
r's p
ri m
ary
di
scon nects.
e.
lnsure that
the racking cams on the breaker
are
correctly positioned for initial engagement with
the
pins in the compartment.
To
do this, insert the rack-
ing handle and rotate
it
fully counterclockwise.
2.
Using
a
suitable
lifting
mechanism and spreader
rig,
position lifting hooks
at
the cutout notches
in
the top wrap-
around frames
of
the breaker. Exercise care
to
avoid damage
to the control wiring.
3.
Open the compartment door. Keeping the rollout tray
positioned
inside the
compartment,
raise
the breaker
above
the elevation of the
tray.
4.
Pull the
tray
all the way out to its WITHDRAWN
limit.
5.
Lower the breaker over the tray until it is about
one-half
inch above the
two dowel pins on the tray. Push the breaker
back into the compartment
untilthe
rear bottom flange
of
the
breaker rests against the guides behind the dowel pins.
6.
Slowly lower and guide the breaker onto
the
tray
so
the
holes in the rear flange fit
over
the two
dowel pins.
When
correctly positioned
on the dowel
pins, the breaker's rear and
side bottom flanges
will
rest firmly on the tray.
7.
Secure the breaker
to
the tray by inserting and tighten-
ing
two-3/a
inch hex head screws
into the
front holes
of its
side
flanges.
8.
Push
the breaker
into the
compartment
until
the
spring
discharge stop
engages, preventing further
movement. This
is
the DISCONNECTED position.
At this point the
racking
cams are positioned to engage the lixed racking pins
in the
compartment, ready
to
begin
the
racking
motion.
It is
to be noted that manually operated breaker models do
not employ a spring discharge interlock.
lt is
unnecessary
because their operating
mechanism never statically posi-
tions the springs
in
a
fully-charged
state. However,
to
provide
necessary means for
mechanically securing the breaker
in
the DISCONNECTED position,
a
position stop
is employed.
It has a
release lever marked
"Push
to
Withdraw" and
is
located
in
the same place
as
the
spring discharge
release
lever on electrically operated breakers
-
see Fig.
4.
:wt x,
FINGER-TYPE
PRIMARY
DISCONNECTS
t'
N
r
rt{
''f
..PUSH
TO WITHDRAW''
RELEASE LEVER
\
9
Fig.4
AKR-58-75 manually
operated (substructure type)