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insulation requires
a
certain amount
of air
gap
between
phases
and
to
ground to
complete the
insulation.
Inserting
any object
in
this
air
space,
when equipment
is
energized,
'\ether
it
be
a
tool
or
a
part
of
the
body,
may under
certain
ditions, in
effect, short
circuit
this air
gap and may
cause
a
--:"cakdown in
the
primary circuit
to ground
and
cause
serious
damage
or injury or
both.
Care
should
be
exercised
in
the maintenance and checking
procedures
that
accidental
tripping
or
operation
is
not
initiated.
RECOMMENDED ANNUAL MAINTENANCE
The
switchgear
structure and
connections
should
be
given
the following overall
maintenance
at
least annually.
All
maintenance
work
must
be
done
with both
the
primary
and
control
po*1
circuits
de-energized.
l.
Thoroughly
clean
the equipment, preferably
using
a
heavy
duty
vacuum cleaner
to
remove all dust and
other
accumulations.
Clean
racking
mechanism and lubricate
jack
screwsand
gears
with lubricant
0282A2048 P009.
fn
Check
primary
disconnecting
device contacts
for
signs
of
abnormal
wear
or
overheating.
Discoloration
of
the
silvered
surfaces is
not
ordinarily
harmful
unless
atmos-
pheric
conditions
cause
deposits such
as
sulphides on
the contacts.
If
necessary
the deposits can
be
removed
with
a
good grade
of
silver polish.
Sandpaper,
steel
wool
or abrasive
cleaners
should never
be used
on
silver-plated
parts.
Before replacing breaker, apply a
thin
coat
of
contact
lubricant
0282A2048 P009
to
breaker
studs
for
lubri-
cation.
2.
3.
4.
Check tightness
and
tions
and
wiring.
continuity of all control
connec-
RENEWAL PARTS
ORDERING INSTRUCTIONS
Renewal
parts should
be
ordered
from
the
Medium Volt-
Switchgear
Business Section.
Specify
the quantity,
reference
number, description
and
this bulletin
number.
For
prices, refer
to
the nearest
office
ofthe
General
Electric
Company.
If
parts listed separately
are
to
be
assembled
at
the
factory,
order must
so
state.
Not all
parts shown
herein
will
be
used on
all
equipment.
Parts
not
used
in original
equipment should not
be ordered
as
renewal
parts.
l3
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