Installation; Location; Mounting; Connections - GE AK-1-15 Instructions Manual

GEH-1807 Air Circuit Breakers Type AK-1-15 andAK;;'i-25
INSTALLATION
e
two bolts holdIDg breaker in
Before being shipped, all breaker adjustments
and settings have been carefully made and checked
by experienced factory personnel. At the time
of installation, it should only be necessary to
observe the operation of the breaker to establish
that no unobservable damage has occurred during
shipment.
LOCATION
The air circuit breaker should "'e installed in
a:
clean dry place where it is readily accessible
for operation, inspection and proper maintenance.
Special enclosures are available for 'the installa-
tion of circuit breakers which may
be
subjected to
dust, and moisture or other unfavorable locations.
MOUNTING
DEAD FRONT BREAKERS
Dead front circuit breakers are designed for
mounting in a switchboard or an enclosing case.
The mounting of dead front breakers consIsts in
placing' the breakers within the enclosed structure
and connecting the power buses or cables and mak-
ing the necessary control connections. The standard
mounting depth from the ba.c;k surface of the breaker
base to the back side of the front panel is
8-:V
4".
The front cover of dead front breakers consists
either
of
a hinged door with cut-out or a plate
bolted to the panel.
o
A terminal board on the right side of the
breaker is used for making various control con-
nections with breaker devices. An auxiliary switch
on the left side of the breaker is used for some
control connections and for cQnnecting various
auxiliary accessories.
The structural surface to which the breaker is
bolted must be
flat
through-out and the supporting
structure must be of sufficient strength to hold the
breaker firmly in place. Minimum cut-out dimen-
sions must be maintamed in order to have proper
electrical clearance.
When disconnects, Fig. 26, are used, the break-
er is placed against the Panel so that the disconnects
fit over the stationary studs to which the power
Circuits are connected. Four 1/2'" mounting
bolts
are ,then inserted into the holes for bolting the
breaker to the panel. When disconnects are not
used, the power circuits are }:)olted to the breaker
studs after bolting the breaker to the panel by using
the four 1/2" mounting bolts. Breakers mounted in
drawouts or an enclosmg case (see below) are
equipped with disconnects.
ENCLOSED BREAKER
The enclosed air circuit breaker is shipped in
an enclosmg case. To install the enclosed breaker,
proceed as follows:
(a) General Purpose Indoor
1. Remove cover from enclosure.
4
2. Remove
place.
3. Remove breaker.
4. Mount case.
5. Make power, control and ground con-
nections.
6. Install breaker in case and replace two
mounting bolts and enclosure cover.
(b) Weather Resistmg
1. Open enclosing case door.
A\,,\,
2. Withdraw breaker (see "Weather Re- •
sisting Enclosing Case").
3. Mount case.
4. Mak,e power, control and ground con-
nections.
5. Insert breaker (see ''Weather Resist-
ing Enclosing Case").
CONNECTIONS
The connections to the circuit breaker studs
should be firmly clamped or bolted in place to
prevent excessive heatllig. The connecting cables
or bus bars should have a current-carrymg capac-
ity sufficient to limit their temperature rise to
that specified for the breakers.
If
these connecting
cables or bus bars are not of sufficient size, heat
will be conducted from them to the breaker so that
the breaker cannot carry normal rated current
without exceeding the specified temperature rise.,
Connecting cables or bus bars should be"supported
so that ilie breaker studs will not be subjected to
unnecessary 'strains.
WffiING DIAGRAM
The wiring diagram, Fig. 1, shows a typical
elementary and typical connection diagram with the
breaker in the open position.
When normal voltage is supplied
to
the control
circuit, either by closing a remote switch or by
pressmg the push button PB, the clo$ing contactor
X coil will become energized through contacts
bb (1-2) and Y (4-3). The X contacts will close,
sealmg m the X coil through cOntact X (1-2) and
energizing the breaker closing coil through epntacts,
X (3-4), X (6-5), and X (7-8). The breaker
will
then
close, thereby openmg the bb contact and closing
the aa contact of the prop switch. Prop switch bb
contact will open the circuit throu.sI! the X contactor
~;ul~on~~:e~gf(3~f),th~ ~6~~er~Jo~~7~~~
Prop switch aa contact will cause the permissive
relay Y coil to become energized providing contact
is maintained on the closing switch. The Y relay
will also open the circuit of the X contactor COil,
thereby providing an anti-pump feature.
Operating the remote trip switch with the _
breaker closmg will cause the shunt trip coil be- •
come energized and will trip the breaker. The trip .
impulse is. interrupted by an "a" contact of the
auxiliary switch.