Powell Power/Vac - T. ROOF ENTRANCE BUSHINGS

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48
Installation
Power/Vac® Metal-Clad Switchgear 5kV & 15kV
01.4IB.67000
T. ROOF ENTRANCE BUSHINGS
When assembling the connection bar end of
roof entrance bushings inside of the switchgear
and other terminations where porcelain
insulators are used, refer to the specific
drawings furnished with the equipment
describing the specific installation instructions.
In most applications, insulation should be
applied as follows:
1. Prepare the connection bars for insulation
as outlined in Ch 4 Installation,
L. Connections.
2. Tape the joint as outlined in
Ch 4 Installation, M. Main Bus Assembly,
1) Wrapping of Joints.
Figure 39 Roof Bushing
“C”
.75 (19.1)
Min
“A”
“B”
RB Putty *
Wrap Over First
Skirt Only
“C”
“C”
.75 (19.1)
Min
“B”
“B”
“C”
“A”
RB Putty *
Wrap Over First
Skirt Only
POTHEAD BUSHING TERMINATOR
“A”
Table L Pothead, Bushing, or Terminator
Insulation
Level (kV)
Inner
Filler “A”
Outer
Wrap “B”
“C”
(inches)
Approx. No. of Rolls per Joint
of HV Tape ∆
2” or 3” Bars 4” or 6” Bars
5 or 15
RB Putty* &
3 Layers HV
Tape ∆
2 Layers HV
Tape ∆
3
/ Roll RB Putty*
& 1 Roll HV
Tape ∆
1 Roll RB Putty* &
2 Rolls HV Tape ∆
Note: * Electrical grade rubber base putty
0282A3529P008 in roll form will be
used to grade voids and smooth out
sharp edges of joints. This putty has
no insulation value.
1 roll is /” x 1½” x 5’ long.
∆ HV Tape 0282A3529P004 roll is
.030” x 2” x 30’ long. Apply with
mastic side down.
U. TESTING AND INSPECTION
Do not connect primary cable/bus or control
wiring of the switchgear assembly to an
energized system until all preliminary tests
have been made to the switchgear assembly.
!
WARNING
For test and inspection instructions, refer
to applicable instruction bulletins and any
supplemental documents. For assistance
with testing and inspection, contact Powell
on our website at powellind.com, or call
1.800.480.7273.
Prior to adjustments, servicing, maintenance,
or any act requiring the operator to make
physical contact with the equipment, the
power source must be disconnected and the
equipment grounded. Failure to do so may
result in death or serious injury.
!
WARNING