Siemens GM-SG

Maintenance
Introduction and Maintenance Intervals
Periodic
inspections
and
maintenance
are
essential
to
obtain
safe
and
reliable
operation
of
the
switchgear
.
When
Type
GM
-
SG
switchgear
is
operated
under
"
Usual
Service
Conditions
"
,
maintenance
and
lubrication is
recommended
at
five
year
intervals
.
"
Usual
"
and
"
Unusual
"
service conditions
for
Medium
Voltage
Metal
-
Clad
Switchgear
are
defined
in
ANSI
/
IEEE
C
37.20
.
2
,
clauses
4
and
8.1
.
Generally
,
"
usual
service
conditions
"
are
defined
as an
environment
in
which the
equipment
is
not
exposed
to
excessive
dust
,
acid
fumes
,
damaging
chemicals
,
salt air
,
rapid
or
frequent
changes
in
temperature
,
vibration
,
high humidity
,
and
extremes
of
temperature
.
The
definition of
"
usual service conditions
"
is
subject
to
a
variety
of
interpretations
.
Because
of
this
,
you
are
best
served
by adjusting
maintenance
and lubrication
intervals based
on
your
experience
with
the
equipment
in
the
actual service environment
.
Regardless
of
the
length
of
the maintenance and
lubrication
interval
,
Siemens
recommends that
circuit
breakers
should
be
inspected
and
exercised
annually
.
A
DANGER
Hazardous
voltages
and
High
-
speed
Moving
Parts
Will
cause
death
,
serious
injury
or
property
damage
.
Do
not
contact
energized
conductors
.
Before
working
on or
near
high voltage
conductors
within
switchgear
,
be
sure
they
are
de
energized
and
properly grounded
.
A
.
See ANSI
/
IEEE
C
37.20
.
2
,
clause
7.9
,
which reads
as
follows
:
'
This
insulating covering
is
a
requirement
of
metal
-
clad
switchgear
and is
provided
to
minimize the
possibility
of
communicating
faults
and
to
prevent
development
of
bus
faults
that would result
if
foreign
objects
momentarily
contacted
bare
bus
.
This
insulating
covering
is
usually only
a
part
of
the
primary
insulation
system
,
and
in
such
cases
the
outer
surface of
this
insulating covering
will
not
be
at
ground
potential
.
It
should
not
be assumed
,
therefore
,
that
personnel
can
contact
this
insulating
covering
with
com
-
plete
safety
.
"
A
DANGER
Recommended Hand
Tools
Type
GM
-
SG
switchgear
and
type
GMSG
circuit
breakers
use
both standard
imperial
(
U
.
S
.
customary
)
and metric
fasteners
.
Imperial
(
U
.
S
.
customary
)
fasteners
are
used
in
most
locations
in
the
switchgear
cubicles
.
Hazardous
voltages
and
High
-
speed
Moving
Parts
Will
cause
death
,
serious
injury
or
property
damage
.
Do
not
work
on
energized
equipment
Always
de
energize
and
ground
the
equipment
before
working
on
the
equipment
.
Recommended Maintenance and Lubrication
Periodic maintenance
and
lubrication should include all
the tasks shown
in
Table
7
.
For
the
safety
of
maintenance
personnel
as
well
as
others who
might
be
exposed
to
hazards associated
with
maintenance activities
,
the
safety
related work
practices
of
NFPA
70
E
should
always
be
followed
when
working
on
electrical
equipment
.
Maintenance
personnel
should be trained
in
the
safety
practices
,
procedures
and
requirements
that
pertain
to
their
respective
job
assignments
.
This
manual should be
reviewed
and
retained
in
a
location
readily
accessible
for reference
during
maintenance
of
this
equipment
.
The
user
must
establish
a
periodic
maintenance
program
to
ensure
trouble
-
free
and
safe
operation
.
The
frequency
of
inspection
,
periodic
cleaning
,
and
preventive
maintenance schedule
will
depend
upon
the
operation
conditions
.
NFPA
Publication
70
B
,
"
Electrical
Equipment
Maintenance
"
may
be used
as a
guide
to
establish such
a
program
.
A
preventive
maintenance
program
is
not
intended
to
cover
reconditioning
or
major
repair
,
but should be
designed
to
reveal
,
if
possible
,
the need
for
such actions
in
time
to
prevent
malfunctions
during
operation
.
Switchgear
assemblies
are
enclosed
on
all sides and
top
with
sheet metal
.
Access
into
the enclosure is
provided
by
doors
or
removable
covers
.
Although
the
bus
and connections
are
insulated
in
metal
-
clad
switchgear
assemblies
,
it
is
a
coordinated insulation
system
;
insulation
plus
air
or
creep
distance
equals
a
given
insulation
level
.
A
WARNING
Failure
to
maintain the
equipment
could
result
in
death
,
serious
injury
or
product
failure
,
and
can
prevent
successful
functioning
of
connected
apparatus
.
The instructions contained herein should
be
carefully
reviewed
,
understood
,
and
followed
.
The maintenance tasks
in
Table
7
must
be
performed
regularly
.
47
Courtesy of NationalSwitchgear.com