GE POWER/VAC 4.16 - Positive Interlock; Negative Interlock

After
the
breaker
has
been
racked
fully
into
the
connected
position
and
then
is
removed
from
the
unit
,
the
engagement
and
alignment
of
the
primary
disconnect
fingers
on
the
breaker
studs
may
be
checked
with
respect
to
the
stationary
^
conductor
in
the
unit
.
(
THE
SWITCHGEAR
MUST
BE
WDE
-
ENERGIZED
FOR
THIS
CHECK
.
)
REMOTE
RACKING
ATTACHMENT
The
breaker
can
be
racked
between
the
“
Disconnect
/
Test
”
and
“
Connected
”
positions
electrically
using
the
remote
racking
device
.
See
DESCRIPTION
—
REMOTE
RACKING
ATTACHMENT
.
POSITIVE
INTERLOCK
Use
the
racking
handle
to
turn
the
jackscrew
several
turns
toward
the
connected
position
,
until
the
shutters
are
opened
to
uncover
the
opening
to
the
insulation
tube
and
stationary
conductor
in
the
unit
.
Inspect
the
impression
made
in
the
coating
of
contact
lubricant
0282
A
2048
P
009
in
the
station
-
ary
conductor
surface
by
the
breaker
primary
disconnect
fingers
.
On
1200
and
2000
ampere
ratings
,
there
must
be
heavy
impressions
of
all
the
lingers
on
both
the
top
and
bottom
of
the
stationary
conductor
bar
.
The
impression
should
extend
back
from
the
front
end
of
the
bar
a
minimum
of
1
/
2
inch
and
should
be
no
closer
than
3
/
16
inch
to
either
side
of
the
bar
.
The
positive
interlock
functions
to
prevent
racking
a
breaker
between
the
“
Connect
”
and
“
Disconnect
/
Test
”
positions
except
when
the
primary
contacts
are
open
.
The
positive
interlock
consists
of
a
bar
which
protrudes
from
the
left
side
of
a
closed
breaker
to
engage
a
slot
in
the
left
-
side
racking
mechanism
when
the
breaker
is
in
either
the
“
Disconnect
/
Test
”
or
“
Connected
”
position
.
When
the
interlock
is
engaged
the
racking
mechanism
can
-
not
be
operated
(
See
Fig
.
40
.
)
To
test
the
function
of
the
positive
interlock
install
a
circuit
breaker
following
the
instructions
given
under
BREAKER
INSTALLATION
.
For
the
test
the
control
power
circuits
in
the
metal
-
clad
must
be
energized
.
Place
the
breaker
in
the
“
Disconnect
/
Test
”
position
and
connect
the
secondary
disconnect
device
by
pulling
down
on
the
breaker
handle
and
horizontally
inserting
the
lever
arm
fully
into
the
breaker
to
engage
the
secondary
disconnects
.
This
will
actuate
the
spring
-
charging
motor
and
charge
the
breaker
-
closing
springs
.
BEFORE
PROCEEDING
WITH
THIS
CHECK
,
IT
IS
NECESSARY
THAT
THE
PRI
-
MARY
CIRCUITS
BE
DE
-
ENERGIZED
.
Close
the
breaker
with
the
control
switch
on
the
front
of
the
door
then
attempt
to
insert
the
racking
handle
into
the
hole
in
the
unit
door
.
A
definite
stop
should
be
encountered
,
preventing
the
socket
on
the
racking
handle
from
engaging
the
racking
mechanism
.
On
3000
ampere
ratings
,
there
must
be
heavy
impressions
of
all
the
fingers
on
the
cylindrical
conductor
.
The
impres
-
sions
should
extend
back
from
the
front
end
a
minimum
of
1
/
2
inch
.
IF
THE
CONTACT
WIPE
IS
NOT
PROPER
,
DO
NOT
MAKE
ANY
ADJUSTMENT
.
COMMUNICATE
WITH
THE
NEAREST
GENERAL
ELECTRIC
COMPANY
APPARATUS
AND
SERVICE
ENGINEERING
OF
-
FICE
FOR
INSTRUCTIONS
.
#
BREAKER
RACKING
WITH
FRONT
DOOR
CLOSED
The
circuit
breaker
can
be
racked
in
and
out
of
the
“
Connect
”
position
with
the
front
door
of
the
metal
-
clad
closed
.
For
maximum
safety
the
breaker
must
always
be
racked
with
the
front
door
closed
when
primary
power
is
connected
to
the
metal
-
clad
.
Make
sure
the
breaker
is
open
before
attempting
to
rack
the
breaker
.
The
breaker
is
in
-
stalled
in
the
metal
-
clad
unit
as
described
in
BREAKER
INSTALLATION
.
Engage
the
racking
arms
and
then
close
the
front
door
of
the
unit
and
secure
it
.
Insert
the
racking
handle
into
the
hole
in
the
left
side
of
the
front
door
and
engage
the
racking
mechanism
by
pushing
it
in
fully
.
Rack
the
breaker
by
rotating
the
handle
clockwise
(
60
turns
are
required
)
until
a
positive
stop
is
felt
.
The
breaker
is
now
in
the
fully
connected
position
and
the
tape
indicator
should
read
“
Conn
”
.
Trip
the
breaker
and
rack
it
into
the
connected
position
.
THE
PRIMARY
CIRCUITS
MUST
BE
DE
-
ENERGIZED
BEFORE
MAKING
THIS
CHECK
OF
THE
POSITIVE
INTERLOCK
.
Close
the
breaker
and
attempt
to
insert
the
racking
handle
into
the
hole
in
the
unit
door
.
A
definite
stop
should
be
encountered
,
preventing
the
socket
on
the
racking
handle
from
engaging
the
racking
mechanism
.
If
the
interlock
does
not
function
as
indicated
in
either
of
the
above
cases
DO
NOT
MAKE
ANY
ADJUSTMENT
.
COMMUNICATE
WITH
THE
NEAREST
GENERAL
ELECTRIC
COMPANY
APPARATUS
AND
SERVICE
ENGINEERING
OFFICE
FOR
INSTRUCTIONS
.
NEGATIVE
INTERLOCK
DO
NOT
EXCEED
60
FT
.
LBS
.
TORQUE
.
The
negative
interlock
functions
to
hold
the
breaker
in
a
mechanical
and
electrical
trip
-
free
mode
when
it
is
being
racked
between
the
“
Disconnect
/
Test
”
and
“
Connect
”
posi
-
tions
.
As
an
added
precaution
,
the
negative
interlock
will
trip
the
breaker
and
hold
it
trip
-
free
if
an
attempt
is
made
to
To
rack
the
circuit
breaker
from
the
“
Connected
”
to
the
“
Disconnect
/
Test
”
position
be
sure
that
the
breaker
is
open
then
turn
the
handle
counterclockwise
.
§
39
Courtesy of NationalSwitchgear.com