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Installation
Installing Shipping Sections
The proper method of installation depends on whether the
switchgear has been shipped as one complete group, or in
two or more shipping sections. The general arrangement
drawings will indicate the shipping sections, cubicle numbers
and their location within the switchgear lineup. Sections are
assembled and wired in accordance with the arrangement as
in the final installation.
Before setting and erecting the cubicles, determine the correct
location of each shipping group on the general arrangement
drawing. Sweep the mounting surface to remove all dirt and
debris.
Installing Switchgear with Throat Connection to Power
Transformer
When a transformer is connected to switchgear using a throat
connection, the switchgear should be positioned next to the
transformer as shown in Figure 11. It is very desirable that the
switchgear be placed in position first, and then position the
transformer.
Figure 11. Connecting Transformer and Switchgear for Typical Outdoor Installation
14
Courtesy of NationalSwitchgear.com
If the transformer must be positioned first, conduit couplings
should be provided in the switchgear foundation, so that the
conduits do not extend more than approximately 2" (51mm)
above the switchgear mounting surface. The switchgear
should be positioned near the transformer, and just high enough
to clear the secondary conduits, but low enough that the throat
on the switchgear will clear the opening in the transformer
terminal chamber (throat). When the switchgear is properly
positioned so that the switchgear throat will fit into the trans-
former throat, move the switchgear toward the transformer
until the switchgear throat extends approximately 2" (51mm)
into the transformer throat, and the switchgear anchor bolts
and conduits are correctly aligned. With all points now in align-
ment, conduit caps and floor plate conduit covers removed,
carefully lower the switchgear into its permanent position.
After all leveling and anchoring operations for the switchgear
are complete, draw the sliding throat collar of the switchgear
throat into place against the transformer throat. Tighten the
throat hardware only enough to compress the gasket.
TERMINAL CHAMBER
RISER
SLIDING
TERMINAL
COLLAR
CHAMBER
WALL
RISER
ACCESS
COVER
GASKET
SWITCHGEAR
THROAT
TIGHTEN
HARDWARE TO
DRAW SLIDING
COLLAR INTO
FINAL
POSITION
BUS
EXTENSION
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