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33
Installation
01.4IB.51000C
When assembling the connection bar end
of the roof entrance bushings inside of the
switchgear and other terminations where
porcelain insulators are used, insulation should
be applied as follows:
1. Prepare the connection bars as outlined
Fill all cavities around the contact nuts
and connection bars with electrical grade
rubber-based putty, refer to
. Form a smooth
surface for taping, thus preventing air voids.
The compound is not an insulating medium
and should not be used for that purpose.
2. Wrap joint with insulating tape provided,
maintaining tension on the tape while
wrapping as shown in Figure 24. Where
there are sharp angles, apply additional
layers to obtain equivalent of the insulation
on the flat surfaces.
Figure 24 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 K 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
½ Roll Putty* &
1 Roll Tape ∆
1 Roll Putty* &
2 Roll Tape ∆
Note:
* Electrical grade rubber-based 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 1/8” x 1
½
” x 5’ long
∆
HV Tape 0282A3529P004 roll is
0.030” x 2” x 30’ long. Apply with
mastic side down.
r. B
uS
D
uct
e
ntry
Bus duct entry into the switchgear must
maintain metal-clad switchgear isolation and
integrity. Connections to the bus are made
from the outside of the equipment as is typical
with standard bus duct.
