Siemens GM-SG

Electrical
Connections
Primary
Cable Connections
All
cable connections
to
metal
-
clad
switchgear
must
be
fully
insulated
to
comply
with
the
ANSI /
IEEE
C
37.20
.
2
definition of
metal
-
clad
switchgear
.
Insulation
of
terminations
reduces
the likelihood
of
occurrence
of
arcing
faults
.
In
addition
,
insulation
of
terminations
is
required
to
maintain
the
dielectric withstand
capability
of
the installed
equipment
.
Recommendations
of
the
cable
supplier
should be
followed for
the installation
.
Typical
termination
configuration
is shown
in
Figure
25
.
Because
of
considerable
variations
in
installation
requirements
and available cables
,
Siemens furnishes
a
double
-
bolt
,
double
-
clamp
,
terminal
lug
as
standard
.
For
cable terminations
,
bus
drilling
is
configured
to
accommodate cable terminals
with
hole
patterns
in
accordance
with
NEMA
CC
-
1
standards
.
All
insulating
and
terminating
materials
other than terminal
lugs
and
cable
supports
are
to
be
furnished
by
the
purchaser
.
Secondary
Control
Wiring
Secondary
control
wiring
is
carefully
installed and
tested
at
the
factory
.
Inter
-
group
wiring
at
shipping
splits
can
be
readily
connected
by
referring
to
wire
markings
.
These wires
are
not
terminated and
are
of
sufficient
length
to
be routed
to
their termination
point
after
cubicles
are
bolted
together
.
Terminals
for
these
leads
are
furnished
by
the
purchaser
to
suit the
available
crimping
tools
.
Terminal block
hardware
is
furnished
with
the
switchgear
.
All
wiring diagrams
needed
for
installation
are
furnished
in
advance
.
Wires
can
be
easily
traced
on
wiring diagrams
furnished for
the
switchgear
.
Each device is illustrated
and
identified
with
a
letter
.
Each terminal
on
each
device is
identified
by
an
alphanumeric
code
.
The
wire list
adjacent
to
each device
on
the
diagram
indicates the device and terminal number
to
which
each wire is connected
at
the
next
connection
point
.
All
secondary
control
wiring
installed
by
the
factory
is
neatly
bundled and attached
to
the cubicle device
mounting
plates
.
Make
all
field
connections
in
a
similar
manner
.
Check
that the circuit breaker
,
its
components
,
and the
hinged
front
panel
clear
any
additional
wiring
installed
.
Figure
29
shows
a
typical
secondary
control cable
installation
.
All
purchaser
wiring
is
to
be
routed
behind
the cable
retainer which
is removable
for
installation
purposes
.
Use
plastic
or
nylon
ties
to
secure
all
field
installed wires
to
the
cubicle
structure
.
Figure
29
.
Secondary
Control Cable
Connections
Figure
28
.
Typical
Cable
Termination
Compartment
.
(
Bus
Compartment
Covers
Removed
)
31
Courtesy of NationalSwitchgear.com