GE Industrial Solutions Evolution Switchboards - Manuel (Page 6)

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Chapter 2- Installing the Switchboard
66
BBeeffoorree IInnssttaallllaattiioonn
Before any installation work is performed, study all drawings
furnished by the supplier for the particular installation. These
include arrangement drawings (front, end, and plan views),
connections diagrams, and schedule of equipment. Any
material external to the equipment that may be required to
meet any local codes (such as mats, screens, or railings) is
not furnished.
LLooccaattiioonn
When locating the switchboard, check all applicable codes
for aisle, working space, and placement requirements. The
space at the front must be sufficient to allow the doors to be
opened and removable breakers to be removed.
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We recommend a clearance of one inch between the back
and sides of the switchboard and the wall or obstruction.
However, this clearance is not required unless a 30 kVA or
larger transformer is integral to the switchboard.
RReeaarr AAcccceessss
Some switchboards may require access to field wiring
terminals from the rear. Do not install these switchboards
against a back wall.
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IInnddoooorr EEqquuiippm meenntt
The floor or foundation must be strong enough to prevent
sagging from the weight of the switchboard structure. If the
foundation is subject to vibrations, the equipment must be
specially mounted to prevent transmitting vibrations to the
equipment.
The switchboard must be bolted directly to the floor, as
shown in Figure 3. The floor must be level without any high
spots that might cause misalignment. If the floor is not level,
use floor channels.
N NO OTTEE:: For seismically certified equipment, refer
to the installation instructions on page 5.
If steel floor channels are used, embed them in a level
concrete slab, with the top surface of the channels flush
with the finished floor. To avoid distortion of the structure,
the steel channels must be level and aligned with each other
before the equipment is anchored. The recommended
foundation construction and method of mounting the
switchboard to the foundation are shown in Figure 4.
Channels should be grouted after installation.
O Ouuttddoooorr EEqquuiippm meenntt
Outdoor equipment is usually installed on a level, smooth
concrete pad. When optional channel sills are supplied with
the switchboard, set them on the pad and fill them with
grout, as shown in Figure 5.
CCoonndduuiittss
When the foundation channels are being installed, any
conduits or sleeves required for power and control cables
that are to enter the equipment from underneath should be
located and installed within the available space shown on
the floor-plan drawings. Consider installing conduits or
sleeves that might be required for future connections.
Conduit stubs should extend above the floor enough to
prevent water entering. Also consider the locations of
components in the switchboard and allow space for
swinging cables after they leave the conduit. The lowest live
metal part in the switchboard will be approximately 8 inches
above the bottom of the switchboard (not including floor
sills). Note that the switchboard must be lifted over the
conduit stubs. Terminate the conduits at the switchboard
with the appropriate conduit connectors. Conduits may
require grounding or electrical connection to the
switchboard enclosure.
FFiigguurree 33.. Switchboard bolted to the floor – indoor
construction.
FFiigguurree 44.. Switchboard mounted on floor channels – indoor
construction.
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