Siemens GM-SG - Installation Preparation and Foundations; Installation Preparation Checklist; Foundation Requirements and Types

Installation
Preparation
for
Installation
Prior
to
installation
of
switchgear
,
study
this instruction
manual
and the
switchgear drawings
,
such
as
general
arrangement
,
three
-
line
diagram
,
schematic
diagrams
,
wiring diagrams
,
installation instruction
drawing
,
panel
arrangement
and
panel
arrangement
bill
of
material
,
nameplate
engraving
list
,
and
accessories
drawing
.
Special
attention should
be
given
to
the
foundation
information
contained
in
this manual
as
well
as
the
information
provided
on
the
equipment
drawings
.
Be
sure
that the
foundation conforms
to
the
requirements
described
in
this
manual and the
general
arrangement
drawing
.
Outdoor
Foundations
Whichever
type
of foundation
is used
(
e
.
g
.
,
concrete
slab
,
sill channels
,
piers
or
pilings
)
,
it
must
have smooth and
level
surfaces
.
Surfaces
supporting
the
switchgear
must
be
in
the
same
horizontal
plane
within
1
/
16
"
(
1.6
mm
)
.
If
these conditions
are
not met
,
it
will
be
necessary
to
use
shims
when
installing
the
switchgear
.
For
outdoor
switchgear
,
support
shall be
provided
at
each end and
at
the side
of
every
second cubicle
,
so
that the
span
between
supports
does
not
exceed
36
"
(
914
mm
)
.
Refer
to
Figures
8
and
10
,
and the
switchgear general
arrangement
drawing
for
locations
of
support
and
anchoring
points
.
If
pilings
are
used
,
the diameter is
to
be determined
by
purchaser
,
;
however
,
they
should
not
be less than
12
"
(
305
mm
)
diameter
for sufficient
contact
,
room
for
anchor bolts
,
and
grouting
in
of
bed
plates
(
if
used
)
.
All
shipping
splits
must
be
properly
supported
.
Any
conduits which
are
installed
in
concrete must
be
perpendicular
to
switchgear mounting
surface
.
Conduits
should
extend
a
minimum
of
6
-
3
/
4
"
(
171
mm
)
to
a
maximum
of
7
-
1
/
2
"
(
190
mm
)
above
mounting
surface
.
This
will
allow the conduit
to
enter
the
cubicle
and exclude
entry
of
water
and
rodents
.
Exception
:
If
switchgear
will
be throat
-
connected
to
a
power
transformer
,
see
"
Installing
Switchgear
with
Throat
Connection
to
Power
Transformer
"
for
restrictions
on
height
of
conduits
for
both
primary
and
secondary
conduits
.
Figures
8
-
9
show the method
of
anchoring
outdoor
Shelter
-
Clad
(
walk
-
in
)
switchgear
,
and
Figure
10
shows the
method
of
anchoring
outdoor
non
-
walk
-
in
switchgear
.
Foundation
-
General
Requirements
Prior
to
installation
of
the
switchgear
,
careful
design
,
planning
and
construction
of
the
foundation
or
base
on
which the
switchgear
will
rest must
be made
.
A
thorough analysis
and
careful
construction
may
alleviate
many
problems
at
the
time
of
installation
,
and
during
operation
.
It
is
important
that
a
true
and level
surface
be
provided
,
capable
of
supporting
the
weight
of
the
switchgear
and other related
equipment
.
If
the
switchgear
cannot
be lowered
over
conduits
because
of
headroom
or
other
restrictions
,
conduit
couplings
may
be
grouted
in
flush
with
foundation
,
and
conduit
nipples
added
after
the
switchgear
is
in
place
.
Conduits
should be
capped
during
construction
to
prevent
entry
of
dirt
,
moisture and vermin
.
All
sill channels
,
bed
plates
,
shims
and
anchoring
hardware
are
furnished
by
purchaser
unless covered
by
contract
.
Indoor
Foundations
As
it
is
difficult
to
obtain
a
true
and level
floor
on a
concrete
slab
,
it
is
highly
recommended that
4
"
(
minimum
)
sill channels be
grouted
into
the
floor
as
shown
in
Figure
7
.
The
surface of
the
sills should
be
slightly
above
floor
level
.
The
surfaces of
the
sills
must
be level
and
in
the
same
horizontal
plane
within
1
/
16
"
(
1.6
mm
)
.
There should be
no
projection
above this
plane
within
the
area
covered
by
the
switchgear
.
If
the
floor
or
sills
do
not
meet
this
requirement
,
it
will
be
necessary
to
use
shims when
installing
the
switchgear
on
the
mounting
surface
.
Figure
7
illustrates the location
for
sill channels
for
anchoring
indoor
switchgear
.
Cubicles
may
be
anchored
to
sills
by
use
of
1
/
2
"
(
or
12
mm
)
diameter
anchor bolts
,
or
welded
in
position
.
Important
:
In
the
switchgear primary
entrance
area
,
steel
reinforcing
rods
or
mesh
in
concrete must not
pass
through
the
space
shown
on
the
general
arrangement
drawing
,
even
though
cored
or
bored holes
in
concrete
may
miss rods
or
mesh
.
A
single
phase
of
a
system
should
not
be
encircled
by
ferrous
metals
.
8
Courtesy of NationalSwitchgear.com