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17
Installation
01.4IB.67000
E. POSITIONING THE METAL-CLAD SWITCHGEAR
1) Drawings and Diagrams
Prior to installation, consult and study all drawings and Bill of Materials furnished by Powell. The
drawings include arrangement drawings and wiring and schematic diagrams.
The recommended aisle space for the front and at the rear of the metal-clad 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, inspection and maintenance.
For installation on a pad or sill, the pad or sill shall not extend more than 3” beyond the front of
the switchgear for proper interface and operation of the lift device.
When three or more sections are to be arranged in one continuous lineup, 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-clad switchgear lineup 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-clad
switchgear. It is the user’s responsibility to
comply with these codes and regulations.
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-clad switchgear may be required to meet local code.
These items must be provided by the purchaser.
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