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DEH-41473
Foundation Preparation
Indoor Equipment
Refer to Figure 4.2 along with the owner's foundation
construction drawings and the General Electric supplemental
installation drawings. Although the indoor switchgear
equipment can be mounted directly on a smooth, level floor, it
is recommended that recessed steel channels be installed for
supporting the equipment. Anchor bolts and channels are to
be provided by the purchaser.
NOTICE: When the equipment is installed on a surface
subject to impact (shock) loads due to operating conditions
or environmental seismic (earthquake) conditions, the
anchor bolts should be fabricated of medium carbon steel
(grade 5 load rating).
The floor channels under the front and rear switchgear
anchor points (Figure 4.2) should be embedded in a level
concrete slab with their top surfaces flush with the finished
floor. It is essential that these steel channels be level and
aligned with each other prior to final anchoring, to prevent
distortion of the switchgear structure, to assure proper
mechanical and electrical connections between shipping
splits, and to assure proper interfacing to other close-coupled
equipment.
NOTICE: The embedded steel floor channel in the floor pad
is the preferred anchoring method for the switchgear
assembly. Alternate anchoring methods should be
reviewed and approved by the customer and/or their
authorized representative. When the equipment is subject
to impact (shock) due to operating conditions or
environmental seismic (earthquake) conditions, alternate
anchoring methods must be approved by the customer's
certified structural engineer.
As an option, the General Electric switchgear assembly can be
provided as certified for seismic applications. Samples of the
most seismically significant construction were shake table
tested to qualify the various constructions available. Refer to
DET-463 for further information.
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Courtesy of NationalSwitchgear.com
AKD-20 AR / Entellisys AR Low-voltage Switchgear
General Electric Switchgear and Load Center Substations are
frequently mounted on steel floors and/or structural steel in
industrial installations (such as a mezzanine) to minimize
usage of production floor space. Regardless of the type of
mounting surface, the requirement for a smooth level surface
remains.
If studs or anchor bolts are to be used, they should be
installed in the foundation as it is poured. It is important that
the studs or bolts are spaced to agree with dimensions given
on the General Electric job drawings. The dimensions
between anchor bolts for a particular installation are
dependent upon the configuration of equipment ordered. The
dimensions shown on Figure 4.2 cover the entire standard
enclosures available for AKD-20 AR and Entellisys AR
switchgear.
Figure 4.3 and Table 4.1 illustrates the space available for
conduit and/or cable entrance through the bottom or top of
each equipment section. The space required for control
wiring entry to the optional wiring trough is also shown.
Section 4. Equipment Installation
22
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