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Low
Yohoge Switchgeor, GEK-72101
WARNING:
DE-ENE
RGIZE
EQAIPMBNT
COM-
PLETELY
BEFORE
DOING MAINTENANCE
WORK
ON ANY
DEVICES,
CONNECTIONS,
BAS
WORK, BREAKER
OR FEEDER CABLE
COMPARTMENTS.
THIS
INCLUDES
DE-
ENERGIZING
ANY
CONNECTIONS
TO
OUT-
SIDE
PRIMART
OR SECO,NDART
SOURCES,
SUCH
.eS
?RAIYSFORMERS,
TIE
LINES, ETC.
INSTRUMENTS, INSTRUMENT
TRANSFORMERS
AND
RELAYS
Check
and
inspect
all
devices
to
see
that they
are func-
tioning
properly. Check
that
all
electrical
connections
are
tight.
Check
mounting
of
the
device.
BREAKER
COMPARTMENT
INTERIORS
a.
Thoroughly
clean
interior
of
the breaker
and
instru-
ment compartments. IJse
a vacuum
cleaner
and
clean
rags
only.
Do not
use steel
wool
or
oxide papers.
Blowing with
compressed
air is
not
recommended.
b.
Check
indicating
devices, mechanical and
key inter-
locks.
c.
Check
primary
disconnecting device
contacts for
signs
of abnormal
wear
or
overheating,
Discoloration of
the
silvered
surfaces
is not ordinarily harmful.
These contacts
should be
cleaned
only
by
wiping
with
a lint-free
cloth.
Before replacing
the
breaker, check
the alignment
and
wipe
ofr
the
primary
disconnecting device
contacts.
Apply
a
thin
coat
of
contact
lubricant
D50H47
to
the
house studs
and
fingers
and
to
the
primary
disconnects
on the
breaker.
BUS COMPARTMENT
Before the
following
can be
performed,
remove
the
steel
formed cover
between
units
if
such
covers
have
been
fur-
nished
with the
equipment.
a.
Inspect
the
buses
and
connections
carefully for
evidence
of
overheating
or
weakening
of
the
insulating
supports.
b.
Check
all
connection bolts
in the
bus compartment
and
all
bus mounting and bracing
bolts
for
tightness.
c. Wipe and vacuum
clean
the
buses
and
supports.
d.
Check
the
insulation
on
the bars
that run from
the
breaker studs
through
the
bus structure
to
the
cable com-
partment.
e.
After
cleaning, megger
and record
the
resistance
to
ground and
between phases
of
all
insulated bars,
and
all
buses
and connections. Disconnect
all
control circuits
before
checking resistance.
Do not
use
over
a
1500
volt
megger.
Since
definite
limits
cannot
be
given
for
satisfactory in-
sulation
resistance
values,
a
record
must be kept
of
the
readings.
Weakening
of
the insulation from
one mainte-
nance period
to
the
next
can be
recognized
from the
re-
corded readings.
The
readings
should
be
taken under
simi-
lar
conditions
each
time,
if
possible, and
the
record should
include
the
temperature and
humidity.
FEEDER
CABLE
AND
BUSWAY COMPARTMENT
a.
Inspect
all
main
cable connections
for
signs
of
over-
heating, and
tighten
all
connections.
b.
Check
all
bolts
that
hold
cable
terminals
to
the,con-
nection bars
for
tightness.
c.
Check
neutral bus
and ground
bus
connection and
mounting
bolts
for
tightness.
d.
Check
that
all
secondary
control
wiring
connections
are
tight
and
that all
control cabling
is
intact.
OVERALT SWITCHGEAR
a. Clean and inspect
all
painted
surfaces
and
retouch
where
necessary.
b.
Check
to
see
that
all
anchor
bolts
and other struc-
tural
bolts
are tight.
c.
Check
that
all
breaker
and instrument
compartment
door
latches operate properly.
Under normal
conditions,
the
protective
relays
do
not
operate; therefore,
it
is
important
to
check
the
operation
of
these devices
regularly.
Refer
to
the Relay
Instruction
Book
for
tletailed instructions.
PAINT
REFINISHING
Indoor
switchgear is finished
with
ANSI-61 Gray Glidden
Aqualure
Paint, Cat.
478-E-02115,
which
is
applied
with
an
electrostatic
spray
system
and
is
oven baked.
To
re-
finish
damaged areas,
remove
all
loose
paint, rust,
scale,
oil or
grease.
Sand
any
scratches
smooth.
Apply
ANSI-61
Gray Glidden
Semi-gloss
Tie-Cote'Lacquer, Cat.
468-E-
02111,
using
a
spray can supplied
by the
factory for
touch-up
purposes.
Outdoor
switchgear
is
finished
with an
additional
coat
of
ANSI-61 gray
paint
over
the
baked
finish.
The primer
for the
second
coat
is
ANSI-61 gray Glidden
Semi-gloss
Tie-Cote
Lacquer
Cat.
468-E-02111
and
the final coat
is
Diamond Vogel ANSI-61
Gray Acrylic
Lacquer
Cat.
IC-0702.
To refinish
damaged
areas,
remove
all
loose
paint,
rust,
scale,
oil
or
grease.
Sand
any
scratches
smooth. Spray
with ANSI-61 Gray
Glidden
Semi-gloss
Tie-Cote
Lacquer
Cat.
468-E-02111 as a
prime
coat, and
finish
coat
by
spray-
ing
with
Diamond
Vogel
ANSI-61 Gray
Acrylic
Lacquer
Cat.
IC-0702,
rising spray
cans supplied
by the
factory.
3r
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