GE POWER/VAC 4.16 - Insulating Primary Cable Terminations

connection
between
the
cable
and
switchgear
bus
.
A
pothead
also
prevents
seeping
of
oil
from
the
end
of
oil
-
impregnated
varnish
cambric
or
paper
insulated
cable
.
1
.
Remove
rear
bolted
covers
.
2
.
Remove
batten
(
1
)
,
Fig
.
33
.
#
(
b
)
Clamp
-
type
terminals
and
stress
cones
.
No
insulation
materials
are
furnished
for
cable
termin
-
ations
.
When
potheads
are
supplied
as
part
of
switchgear
,
insulation
materials
are
furnished
for
the
bar
terminations
to
the
pothead
studs
.
\
\
\
\
i
o
<
S
1
—
Batten
S
2
—
Trough
^
3
—
Pull
Box
I
L
u
I
I
oo
ON
I
2
00
oo
•
*
<
CO
00
3
i
Fig
.
33
Installation
of
Primary
Cables
3
.
Remove
cable
trough
cover
and
pull
-
box
cover
.
Fig
.
34
Cable
Termination
without
Pothead
,
Single
Conductor
4
.
Remove
cable
trough
(
2
)
,
Fig
.
33
.
5
.
If
primary
cables
enter
switchgear
from
below
,
termin
-
ate
cables
for
lower
unit
First
.
If
primary
cables
enter
from
above
,
terminate
cables
for
upper
unit
first
.
6
.
Replace
cable
trough
.
7
.
Terminate
primary
cables
in
remaining
unit
.
(
Pulling
cables
thru
cable
trough
.
)
8
.
Replace
pull
-
box
cover
,
cable
trough
cover
,
batten
and
rear
bolted
covers
.
In
all
cases
,
carefully
follow
the
cable
manufacturer
’
s
recommendations
for
installation
of
the
type
of
cable
being
used
.
A
typical
example
of
terminating
a
shielded
cable
is
shown
in
Fig
.
34
.
If
the
cable
is
aluminum
,
the
conductor
surface
must
be
carefully
abraded
and
the
cable
covered
liberally
with
a
joint
compound
recommended
by
the
cable
manufacturer
.
INSULATING
PRIMARY
CABLE
TERMINATIONS
All
field
-
assembled
joints
for
primary
cable
terminations
should
be
prepared
as
outlined
under
CONNECTIONS
.
Upon
completion
of
the
cable
termination
,
care
must
be
exercised
when
taping
the
exposed
joint
.
1
.
Check
to
see
that
a
sufficient
area
of
insulating
tape
extends
beyond
the
insulation
furnished
on
the
term
-
inal
bars
(
2
inches
for
5
kV
,
3
inches
for
15
kV
)
.
Refer
to
Fig
.
23
.
2
.
All
terminations
should
be
insulated
as
outlined
in
table
,
Fig
.
23
,
for
correct
layers
of
insulation
.
3
.
The
instructions
for
application
of
the
tape
insulation
is
the
same
as
outlined
for
TAPED
JOINTS
.
Before
any
primary
cable
connections
are
made
,
the
cables
should
be
identified
to
indicate
their
phase
relation
-
ship
with
the
switchgear
connections
.
This
is
necessary
to
assure
that
motors
will
rotate
in
the
proper
direction
and
that
the
phase
rotation
is
the
same
when
interconnecting
two
different
sources
of
power
.
There
are
two
common
methods
of
making
primary
cable
connections
:
(
a
)
Potheads
Potheads
are
used
when
it
is
desired
to
hermetically
seal
the
end
of
the
cable
to
make
a
moisture
-
proof
33
Courtesy of NationalSwitchgear.com