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14
Installation
01.4IB.26264A
FlexGear
™
Low Voltage Arc Resistant Switchgear
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1) Drawings and Diagrams
Before any installation work is started,
consult and study all drawings and Bill
of Materials furnished by Powell for the
particular order. The drawings include
arrangement drawings and wiring and
schematic diagrams.
The recommended aisle space for the
front and at the rear of the metal-enclosed
switchgear is shown on the floor plan
drawing furnished for the particular order.
The space at the front must be sufficient
to permit insertion, withdrawal, and
transferring of the circuit breakers. The
space at the rear must be sufficient for
installation of cables, for inspection and
maintenance. The dimensions shown on
the switchgear drawings are those required
for proper operation of the switchgear.
When three or more sections are to be
arranged in one continuous line-up,
the center section should be the first to
be located. The other sections should
be installed in successive order in each
direction from the center of the structure.
When installing a unit substation or power
center, the power transformer and the
adjacent metal-enclosed switchgear line-up
should first be lined up and set in position
in accordance with the dimensions on
the base plan drawing for the installation.
The additional sections should then be
installed.
Establish a base line located a few inches in
front of the sections and parallel with the
desired front of the structure. Equalize the
distances from the front of the sections to
the base line to make the face of the group
parallel to the base line.
Applicable national or local codes or
regulations may require greater aisle space
than is needed for operation of the
metal-enclosed switchgear. It is the
purchaser’s responsibility to comply with
these codes and regulations.
CAUTION
Additional shipping members may have
been installed in the bus or primary area
to ensure against shipping damage. All
shipping members must be removed from
the switchgear compartments. All joints
must be properly tightened and insulated
before energizing the bus.
Mats, railing, etc. that are external to
metal-enclosed switchgear may be required
to meet local code. These items must be
provided by the purchaser.
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The station floor must be strong enough to
remain rigid and not sag under the weight of
the switchgear structure. The floor also must
be able to withstand the impact stress caused
by the opening of the circuit breakers under
short circuit conditions.
