Siemens GM-SG

Electrical
Connections
Ground Connections
A
common
ground
bus is
incorporated
in
all units
for
properly grounding
the
equipment
after
installation
.
The
ground
bus
extending
through
the
switchgear
is
accessible
in
the
primary
cable
area
of
each unit
.
The
interunit
connector
has
provisions
for
two
bolts
at
each
end
.
For
ease
of
assembly
,
install bottom bolts
first
.
Insure
that the
ground
bar
to
the
circuit
breaker
cell is
also bolted
to
interunit bar
,
as
shown
in
Figure
30
.
Provision
for
connecting
this
ground
bus
must
be made
in
such
a manner
that
a
reliable
ground
connection is
obtained
.
Consult
latest National Electrical
Code
(
NFPA
70
)
for
ground
connection standards
.
Right
Rear
Side Sheet
Right
Mid
Side Sheet
TIT
7
Ground
Bar
to
Cable
Area
Front
of
Unit
—
Connector
to
Circuit
Breaker
Cell
CD
s
/
s
8
1
Interunit
Ground
Bar
Figure
30
.
Ground
Bus
Connection
Temporary
Ground Connections
It
is
recommended that
no
work be done
on
current
carrying
parts
until
these
parts
have been
disconnected
from
the
system
and
solidly
grounded
.
One
method
of
solidly grounding
the
high voltage
circuit is
by
use
of
a
grounding
device
.
This device is
placed
in
a
cubicle
in
the
same manner as a
circuit breaker and
provides
a
path
to
ground
.
It
is
furnished
only
when
specified
in
the
contract
.
32
Courtesy of NationalSwitchgear.com