Siemens GM-SG - General Description of Switchgear; Introduction to General Description; Scope of Instruction Manual; Metal-Clad Construction Details

General
Description
Standard
construction details
of
the
switchgear
,
auxiliary
equipment
and
necessary
accessories
are
given
in
the
appropriate
sections
.
Special
mechanical
and
electrical devices
,
furnished
in
accordance
with
purchase
order
requirements
,
are
covered
by
supplementary
instructions submitted
with
this instruction book
.
The
equipment
furnished
has been
designed
to
operate
in
a
system
having
the circuit
capacity
specified
by
the
purchaser
.
If
for
any
reason
the
equipment
is used
in
a
different
system
,
or
if
the short
-
circuit
capacity
of
the
system
is increased
,
the
ratings
of
the
equipment
,
including
the
momentary
rating
of
the
switchgear
,
the
interrupting capacity
of
the circuit breakers
,
and
the bus
capacity
must
be checked
.
Failure
on
the
part
of
the
user
to
receive
approval
of
intended
changes
from
Siemens
may
cause
voiding
the
warranty
.
Figure
7
.
Typical
Indoor
Type
GM SG
Switchgear
Introduction
The
successful
performance
and
application
of
Metal
-
Clad
Switchgear
depends
as
much
on
proper
installation
and
maintenance
as
it
does
on
good design
,
careful
manufacture
and
correct
application
.
Siemens
Type
GM
-
SG
Metal
-
Clad
Switchgear
is
precision
built
equipment
designed
to
function
efficiently
under
normal
operating
conditions
.
It
is
designed
and
manufactured
to
operate
within
the
parameters
established
in
ANSI
/
IEEE
C
37
standards
for
Metal
-
Clad
Switchgear
.
Performance
requirements
of
these standards have been
met
or
exceeded
by
these
designs
.
The
principal
standard
which
applies
to
this
class
of
switchgear
is
ANSI /
IEEE
C
37.20
.
2
,
"
Metal
-
Clad
Switchgear
"
.
This
equipment
is
not
classified
as
arc
-
resistant
switchgear
,
and has
not
been tested
for
resistance
to
internal
arcing
per
IEEE
C
37.20
.
7
.
The
instructions
included
in
this manual
are
provided
to
aid
you
in
obtaining
longer
and
more
economical service
from
your
Siemens
switchgear
.
For
proper
installation
and
operation
,
this
information
should
be
distributed
to
your
operators
and
engineers
.
By
carefully following
these instructions
,
difficulties
should be
avoided
.
Flowever
,
these
instructions
are
not
intended
to
cover
all details
of
variations
that
may
be
encountered
in
connection
with
the
installation
,
operation
and
maintenance
of
this
equipment
.
Should
additional
information
be desired
,
including
replacement
instruction manuals
,
contact
your
Siemens
representative
.
General
Description
The
switchgear
described
in
this manual is
of
the metal
-
clad
type
,
as
defined
in
ANSI /
IEEE
C
37.20
.
2
.
All
parts
are
completely
enclosed
within
grounded
metal barriers
.
Secondary
control
devices
and
primary
circuits
are
isolated
from
each other
by
shutters
or
barriers
.
Primary
bus and
joints
are
completely
encased
with
insulation
materials
to
suit the
voltage
class
of
the
equipment
.
Siemens
switchgear
carries
a
type
designation
,
or
class
,
as
shown
in
Table
1
.
These
designations
may
appear
on
drawings
and
familiarity
with
them
will
simplify
communications
with
the
factory
.
Indoor
equipment
is
arranged
with
upper
and lower
primary
compartments
and
a
center
secondary
compartment
in
the
front of
the
equipment
.
Generally
,
primary
compartments
may
contain
either
a
drawout circuit breaker
or
interior
auxiliary
equipment
,
such
as
voltage
or
control
power
transformers
,
located behind
a
front
panel
.
The
front
panels
can
be used
for
relays
,
instruments
,
and
similar devices
.
Primary
compartment
front
panels
may
be
opened
to
provide
access
to
the circuit breaker
or
interior
auxiliary
equipment
while the
secondary
compartment
front
panel provides
access
to
secondary
control
equipment
.
Typical
indoor
switchgear
is
shown
in
Figure
1
.
Table
1
.
Switchgear
Designation
DESIGN
TYPE
Indoor
GM
-
SG
Shelter
-
Clad
Single
-
Aisle
Outdoor
SGM
-
SG
Shelter
-
Clad Common
-
Aisle
Outdoor
SGM
-
SG
Non
-
Walk
-
in
Outdoor
OGM
-
SG
Shelter
-
Clad
outdoor
equipment
consists
of
indoor
equipment
enclosed
in
a
weather
-
resistant
housing
complete
with
an
illuminated
,
walk
-
in
aisle
.
Circuit
breakers
can
be moved inside the
aisle and control devices checked without
exposure
to
the elements
.
Non
-
Walk
-
In
outdoor
switchgear
consists
of
indoor
equipment
enclosed
in
a
weather
-
resistant
housing
complete
with
a
gasketed
outer
door
over
the inner
front
panels
.
Circuit
breakers
can
be moved
outside
of
the cubicles
with
the
use
of
a
lift
truck
or
similar
handling
device
.
Non
-
Walk
-
ln
outdoor
equipment
is
used where
an
enclosed service
aisle
is
unnecessary
,
or
space
does
not
permit
its
use
.
Scope
These instructions
cover
the
installation
,
operation
and
maintenance
of Siemens
type
GM
-
SG
metal
-
clad
switchgear
assemblies
,
using
horizontal drawout
vacuum
circuit
breakers
.
The
equipment
designs
described
in
this manual include indoor
,
Shelter
-
Clad
walk
-
in
aisle outdoor
,
and
non
-
walk
-
in
outdoor
configurations
for
application
up
to
15
kV
.
A
typical
indoor
switchgear
assembly
is
shown
in
Figure
1
.
All
diagrams
,
descriptions
and instructions
apply
to
all
the
above classes
and
designs
unless noted otherwise
.
3
Courtesy of NationalSwitchgear.com