Westinghouse DB-75 User Manual

tr
1
.
PART
TWO
r
INSTALLATION
CONNECTIONS
Type
"
DB
"
circuit
breakers
are
furnished
as
complete
unit
assemblies
and
the
installation
con
-
sists
of
:
(
1
)
bolting
them
to
the
supporting
frame
-
work
or
structure
;
(
2
)
connecting
the
current
carry
-
ing
cables
or
bus
bars
;
and
(
3
)
completing
any
secondary
control
wiring
that
may
be
necessary
.
Caution
:
During
installation
,
the
circuit
breaker
should
be
in
the
open
position
.
Be
sure
to
de
-
energize
the
load
and
control
leads
to
be
connected
,
and
also
the
section
of
the
switchboard
where
installation
is
being
made
.
Mounting
dimensions
and
details
of
the
front
en
-
closure
cutouts
are
shown
in
Figs
.
1
,
1
A
,
IB
,
and
1
C
.
To
prevent
distortion
of
the
breaker
panel
,
the
supporting
structure
should
be
checked
for
align
-
ment
.
Magnetic
material
in
the
mounting
structure
should
have
at
least
two
inches
clearance
to
the
breaker
studs
.
A
manual
closing
handle
is
supplied
with
each
order
of
DB
-
75
and
DB
-
100
breakers
.
This
handle
is
for
maintenance
only
and
in
no
case
should
it
be
used
for
closing
the
breaker
when
primary
circuit
is
energized
.
Typical
circuit
breaker
wiring
diagrams
are
shown
in
Fig
.
2
,
The
connecting
cables
or
bus
bars
should
have
adequate
current
carrying
capacity
,
or
heat
will
be
conducted
to
the
circuit
breaker
resulting
in
possible
excessive
temperature
rise
.
Connecting
cables
or
bus
bars
must
be
supported
so
that
the
circuit
breaker
studs
will
not
be
subjected
to
unnecessary
stresses
.
ENCLOSURES
The
breaker
is
normally
mounted
in
the
enclosure
along
with
accompanying
bus
work
terminating
in
cable
clamps
.
Where
covers
are
mounted
on
en
-
closures
,
they
are
to
be
removed
and
drilled
to
provide
for
connecting
cable
,
All
connections
should
be
clean
,
smooth
and
free
from
burrs
to
assume
full
contact
area
.
They
should
be
firmly
clamped
or
bolted
in
place
to
prevent
excessive
heating
.
Cable
must
be
adequately
braced
to
withstand
full
short
circuit
currents
.
-
)
£
f
;
»
<
5
V
•
1
'
8
Courtesy of NationalSwitchgear.com

Westinghouse DB-75 Specifications

General

Brand	Westinghouse
Model	DB-75
Category	Circuit breakers
Language	English